Rolls-Royce Archives
| Identifier | Entry | ||
| scan0001 | Secret internal memo forwarding Mr. Royce's correspondence regarding servo and brake development. | ||
| View original record | X. 9940 To RG. HS. ) BY. DA. ) FROM E. S E C R E T. E1/M1.5.24. E. A. C. X. 9940. We send you herewith copy of Mr. Royce's memo which he wrote on the 27th. ult. :- "Dear Mr. Elliott, I have just… | ||
| scan0002 | Investigating brake jaggers and the effect of brake drum stiffness on various cars. | ||
| View original record | R.R. 493A (20H) (D.A. 652 20-3-24) J.E.D. EXPERIMENTAL REPORT. To R. from Hs. c. to CJ. RG. c. to DA. E. c. to BY. WOR. Expl. No. 4214 1559 REF: Hsl/LG1.5.24. SECRET. BRAKE JAGGERS. Hispano Car. We… | ||
| scan0003 | Tests conducted to understand and eliminate brake 'jaggers' by modifying brake shoes. | ||
| View original record | R.R. 493A (20H) (D.A. 652 20-3-24) J.H.D. -2- EXPERIMENTAL REPORT. Expl. No. 4214 9940 REF: Hs1/LG1.5.24. When we found we could not get any braking with direct pressure on the front brakes we carried… | ||
| scan0004 | Braking tests concerning 'jaggers' and brake locking. | ||
| View original record | R.E. 423A (20H) (D.A. 652 20-3-24) J.H.D. -4- EXPERIMENTAL REPORT. Expl. No. 9940 4214 REF: Hs1/LG1.5.24. disappeared and also we could get no braking. We had anticipated from the theories put forward… | ||
| scan0005 | List of unsuccessful experiments carried out to eliminate front wheel brake jaggers on vehicle EAC.111. | ||
| View original record | DETAILS OF TESTS CARRIED OUT TO DATE ON FRONT WHEEL BRAKE JAGGERS ON EAC.111. The following experiments have proved unsuccessful in eliminating or in any way altering the jaggers :- 'A' - EXPERIMENTS… | ||
| scan0006 | List of experiments conducted on brakes and brake carriers, detailing various modifications and operational methods. | ||
| View original record | 'B' - EXPERIMENTS ON BRAKES AND BRAKE CARRIER. (15) Varying amount of slack in shoe anchorage. (16) Flexible brake shoes fitted ( bronze ) (17) Floating fulcrum brakes fitted. (18) All types of split… | ||
| scan0007 | Methods to eliminate and causes not affecting brake 'jaggers'. | ||
| View original record | WE CAN ELIMINATE JAGGERS BY :- (1) Fitting some form of torque arm or parallel radius rods to the front axle. (2) Introducing an oil dashpot in parallel with the front brake operation; this makes it… | ||
| scan0008 | The RRM scheme of brakes, detailing its operation, servo action, and an investigation into brake lag. | ||
| View original record | R.R. 403A (20H) (D.A. 652 20-3-24) J.B.D. EXPERIMENTAL REPORT. To R. from Hs. c. to CJ. RG. c. to DA. E. c. to BY. WOR. Expl. No. 9940 4214 REF:Hs3/LGL.5.24. Handwritten: +9940 S E C R E T.… | ||
| scan0009 | Comparing brake lag and servo operation between the RRM and Hispano schemes. | ||
| View original record | R.R. 493A (20H) (D.A. 652 20-3-24) J.H.D. -2- EXPERIMENTAL REPORT. Expt. No. 9940 REF: Hs3/LG1.5.24. We have been able to find the lag on the RRM. scheme, but but it is very difficult to distinguish… | ||
| scan0010 | The ordering of material for four-wheel brakes. | ||
| View original record | 49940 D.P. F.E.T. C. Ons. c. Hs. RE ORDERING MATERIAL FOR FOUR WHEEL BRAKES. In regard to BY3/H. 30. 4. 24, the 200 sets of material represents all the special material we should have on order at the… | ||
| scan0011 | Secret memorandum regarding the testing of various cars, including a Hispano and EACs, fitted with different brake and design schemes. | ||
| View original record | x9940 To R. from Hs. c. to CJ. RG. c. to DA. E. c. to BY. Wor. S E C R E T. 4-WHEEL BRAKES. x9940 x4214 We propose arriving at WW. on Tuesday morning with the - Hispano, 40/50 HP. fitted with the… | ||
| scan0012 | Comparison table of different front wheel brake schemes. | ||
| View original record | FRONT WHEEL BRAKE SCHEMES COMPARED. | SCHEME. | Servo speed. | Servo ratio Torque out / Torque in | Direct braking without servo assistance. | Total braking. | Torque to servo from pedal. | Max. dist… | ||
| scan0013 | Servo braking system issues and design improvements following a conference at Derby. | ||
| View original record | To RG. E. )from R. DA. Hs.) c. to CJ. Wor. By. S E C R E T RE CONFERENCE AT DERBY ON EAC:2 & 3. Mr. Day has told us that servo troubles might be due to the driving dogs binding. This has proved true… | ||
| scan0014 | Comparing two direct braking schemes, for the rear axle only versus all four wheels. | ||
| View original record | R3/M1.5.24. -2- Contd. (1) Direct foot to rear axle only- present 40/50 leverage. } This gives (2) Direct foot to 4 wheels - half } equal clearances. present 40/50 leverage. } to see which scheme… | ||
| scan0015 | Modifications to a car's braking system, including lever proportions and Mr. Royce's design preferences. | ||
| View original record | Y9940 To Hs. from Da. SECRET. DA1/M2.5.24. RE. EAC.3. CARS. X.9940 X.9770 You will have heard from Mr. Royce that he is interested in RRM. DES.60. more than any other. We sent you a lever with the… | ||
| scan0016 | Issues with four-wheel brakes on 40/50 HP cars, including scored drums and a steering tube failure. | ||
| View original record | R.R. 493A (20H) (D.A. 652 20-3-24) J.H.D. 49940 EXPERIMENTAL REPORT. Expl. No. 9940 9420 REF: Hsl/LG3.5.24. To R. from Hs. c. to CJ. RG. c. to DA. E. c. to BY. WOR. S E C R E T. FOUR WHEEL BRAKES. It… | ||
| scan0017 | Secret memorandum discussing modifications to the brake system, specifically the linkage, balancing levers, and braking ratios. | ||
| View original record | X.9940 To BY. from DA. c. to CJ. HS. Wor. S E C R E T. Dal/M8.5.24 EAC.111. BRAKES. X.9940. Herewith we send N.sch.1801 shewing the arrangement of the linkage to suit servo shewn on LeC.1867. etc. and… | ||
| scan0018 | Testing a car's brake servo with a modified reduction ratio, comparing the lag to a Hispano. | ||
| View original record | To R. from Hs. c. to CJ. RG. c. to DA. E. c. to EY. Wor. X9940 (handwritten) S E C R E T. Hs3/LG9:5.24. BRAKES. X.9940 X.4214 We have tested the car fitted with the 'Agreed' scheme with the servo… | ||
| scan0019 | List of required modifications for parts on the front brake and front axle. | ||
| View original record | X9940 W Mr. Hives Hs. BY6/H. 9. 5. 24. E.A.C.III. MODIFICATIONS TO PARTS ON FRONT BRAKE. The following modifications are necessary to Brake parts on the Front Axle in order to obtain what Hs.… | ||
| scan0020 | List of specifications for steering and brake components. | ||
| View original record | - 2 - 6. The Cross Steering Tube is to be increased in section 50%, I consider 1.562 outside diameter, 12 SWG. to be satisfactory for this purpose. 7. Covers must be fitted on the Ball Joints, and… | ||
| scan0021 | Comparing different brake schemes and outlining the advantages of a proposed 'adopted' scheme. | ||
| View original record | 49940 SECRET R1/M9.5.24. To C.J. from R. c. to BJ. Wor. c. to RG. E. c. to HS. EP. c. to Mr. Claremont. EAC.11. & 111. BRAKES ETC. X.9940 X.8770 On the 6th. inst. HS. brought us 4 cars, one being the… | ||
| scan0022 | Test report comparing a car to a Hispano, detailing issues with brakes, clutch, carburetter and suggesting modifications. | ||
| View original record | contd; -2- (6) Simple and efficient compensation of the action of the servo between the front and back wheels by means of the floating lever, and not dependent upon the doubtful skill of the ordinary… | ||
| scan0023 | New servo-operated four-wheel braking system and arranging a test drive in London. | ||
| View original record | W/S. PN. from Hs. SECRET. Hs7/LG12.5.24. 49940 4-WHEEL BRAKES. We have now running, what we call, an adopted scheme for the operation of the four-wheel brakes. Briefly, this is servo operation… | ||
| scan0024 | Testing, production plan, and financial risks for a new chassis brake 'Adopted Scheme'. | ||
| View original record | X9940 To -- from Wor. PRIVATE. Worl/M13/5/24. c. to Hs. c. to Df. re Brakes. ------- Your CJ1/E12/5/24. We agree generally with R's praise of the Adopted Scheme; all are satisfied that it is very… | ||
| scan0025 | Testing and modification schedule for the E.A.C. engine before a sales decision is made. | ||
| View original record | -2- As regards the E.A.C. engine, we advise caution and further tests. Towards the end of the month the modifications mentioned by R. will be fitted on a chassis and everybody will have a chance of… | ||
| scan0026 | Secret memorandum from DA to HS regarding the fitting of a servo braking system and a potential gearbox upgrade for a chassis. | ||
| View original record | X9940 To HS. from DA. S E C R E T. DAL/M13.5.24. E. A. C. 1. X.9940 X.9320 We have gone into the question of fitting the present braking system to this chassis, including the servo, but it does not… | ||
| scan0027 | Secret memo regarding the postponement of a vehicle test to fit a new brake scheme and arrange a trial for an experimental car. | ||
| View original record | X9940 To B.J. from Hs! SECRET. Hs3/LG15.5.24. E. A. C. X8770 X9940 It will not be possible to fit on to the EAC. car (which we are preparing for the 19th.) the final brake arrangement. We are very… | ||
| scan0028 | The effect of unequal four-wheel braking on the steering of the 40/50 HP car. | ||
| View original record | R.R. 493A (40 H) (EL 42 12-7-23). J.H., D. EXPERIMENTAL REPORT. To R. from Hs. c. to CJ. RG. c. to DA. E. c. to BY. WOR. Expl. No. 9940 / 9420 REF: Hs1/LG15.5.24 S E C R E T. FOUR-WHEEL BRAKES. We… | ||
| scan0029 | Comparing steering behavior during braking with and without a torque arm. | ||
| View original record | R.R. 493A (40 H) (SL 42 12-7-23). J.H., D. -2- EXPERIMENTAL REPORT. Expl. No. 9940 REF: Hsl/LG15.5.24. not get the same tendency for the steering to be pulled out of ones hands when the brake is… | ||
| scan0030 | The tendency of the steering wheel to turn during braking and the effects of spring strength. | ||
| View original record | R.R. 493A (40 H) (SL 42 12-7-23). J.H., D. -3- EXPERIMENTAL REPORT. Expl. No. 9940 REF:Hs1/LG15.5.24. vigorously, there is a distinct tendency for the steering wheel to turn and it requires… | ||
| scan0031 | Initial load settings on a steering component to mitigate steering wobbles and road shocks. | ||
| View original record | B.R. 493A (40 H) (SL 42 12-7-23). J.H., D. -4- EXPERIMENTAL REPORT. Expl. No. 9940 REF: Hsl/LG15.5.24. set-up on the ball is 30 lbs. On the 20 HP. it is 70 to 80 lbs. On the 40/50 cars which have been… | ||
| scan0032 | The steering effects caused by axle twist under four-wheel braking. | ||
| View original record | R.R. 493A (40 H) (SL 42 12-7-23). J.H.D. -1- EXPERIMENTAL REPORT. Exptl. No. REF: Hs/Rm/LG15.5.24. STEERING EFFECTS WITH FOUR-WHEEL BRAKES. We have been investigating the way in which the axle twists… | ||
| scan0033 | Page 2 detailing steering behavior and pivot lean during single-brake application. | ||
| View original record | R.R. 403A (40 H) (SL 42 12-7-23). J.H. D. -2- EXPERIMENTAL REPORT. Expl. No. 9940 REF: Hs/Rm/LG15.5.24. With one brake only in action, the pivot on the side where the braking is taking place, assumes… | ||
| scan0034 | Centre-point steering, castoring action, and the effect of the torque arm. | ||
| View original record | R.R. 493A (40 H) (SL 42 12-7-28). J.H. D. -3- EXPERIMENTAL REPORT. Expl. No. 9940 REF: Hs/Rn/LG15.5. 24. with centre-point steering. Once it has started the reverse, castoring action will, of course,… | ||
| scan0035 | Secret memo discussing fitting a more rigid control to the front axle and testing irreversible steering. | ||
| View original record | 49940 To HS. from EA. R. S E C R E T. R2/M17.5.24. E.A.C. X.9940 X.9420 You have now given us a very definite reason for fitting a more rigid control to the front axle so that the spring deflection… | ||
| scan0036 | Secret internal memo comparing figures for front axle twist on cars with different spring types. | ||
| View original record | To R. from Hs. c. to CJ. RG. c. to DA. E. c. to BY. Wor. [Handwritten: 49940 (crossed out)] SECRET [Handwritten: 49420 (crossed out)] [Handwritten: 49940] Hs4/LG17.5.24. Attached herewith are further… | ||
| scan0037 | The measurement of front axle twist due to braking. | ||
| View original record | R.R. 493 (40 H) (SL 42 12-7-23). J.H., D. EXPERIMENTAL REPORT. COPIES TO: R.CJ. BJ. WOR. By. E. Da. EP. PN. OY. Expl. No. 9940 (handwritten 9420) REF. Hs/RB1/LG17.5.24 OBJECT OF TEST. Measurement of… | ||
| scan0038 | Wire confirmation from Royce to Hives regarding excessive front brake deflection affecting steering. | ||
| View original record | x9940 CONFIRMATION OF WIRE. HIVES. ROYCAR. DERBY. WEST WITTERING. 19. 5. 24. DEFLECTION FROM FRONT BRAKES AFFECTING STEERING SEEMS EXTREMELY GREAT. SUGGEST FOR IMMEDIATE PRODUCTION REDUCING PROPORTION… | ||
| scan0039 | Brake linkage scheme, discussing servo torque multiplication and distribution ratios. | ||
| View original record | R.R. 403A (40 H) (SL 42 12-7-23). J.H., D. EXPERIMENTAL REPORT. Expl. No. 9940 REF: Hs/ACL/1.M9.5.24 To DA. from Hs. S E C R E T. EAC.111. BRAKE LINKAGE "ADOPTED" SCHEME. Referring to your… | ||
| scan0040 | Reverting from four bolts to eight on the outer diameter of the servo's friction plate carrier for design consistency. | ||
| View original record | X9940 Mr. D'Aeth. Hs. RHS. BY9/H. 19. 5. 24. BOLTS ON OUTER DIAMETER OF CARRIER FOR FRICTION PLATES COUPLING SAME UP TO CONE DISC DRIVEN FROM THE END OF THE SERVO. Mr. D'Aeth has pointed out to me… | ||
| scan0041 | Secret memorandum regarding the 10,000-mile trials of 4-wheel brake systems, including plans to send test cars to France. | ||
| View original record | Y9940 To WOR. from HS. S E C R E T. HS5/LG19.2.24. BRAKES - CJA/E16.5.24. Y9940 / Y9941 With reference to the 10,000 miles trails of cars fitted with the adopted scheme of brakes. It is our intention… | ||
| scan0042 | The performance of 4-wheel brakes, detailing safety concerns, passenger comfort, and adjustment procedures for a new trials car. | ||
| View original record | -2- car travelling at a high speed. There is a risk of passengers losing their lives if the brakes do not perform perfectly or affect the steering under this condition. (b) To ensure that the brakes… | ||
| scan0043 | Measurement of spring deflection and pivot inclination during front wheel braking experiments. | ||
| View original record | To Hs; from DA. X9940 S E C R E T. DAL/M20.5.24. E.A.C. X.9410 X.8410 X.9940 With reference to your report re. the deflection of the springs under front wheel braking it would be interesting to know… | ||
| scan0044 | The policy and effects of four-wheel brake systems. | ||
| View original record | R.R. 493a (20H) (D.A. 652 20-3-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. 9940 REF: Hel/102.5.24. S E C R E T. To R. from HS. c. to CJ. RG. c. to DA. E. c. to BY. Wor. c. to PN. FOUR-WHEEL BRAKES. From… | ||
| scan0045 | The dangers of locked wheels during braking and the challenges of achieving equal braking. | ||
| View original record | R.R. 403A (20H) (D.A. 652 20-3-24) J.H.D. -2- EXPERIMENTAL REPORT. Expl. No. 9940 REF Hsl/LGR1.5.24. which, when the wheels lock continues in a straight course, is more dangerous than one which skids… | ||
| scan0046 | Continued memorandum discussing variation in braking performance between different cars. | ||
| View original record | contd:- -2- Hsl/LG21.5.24. cars we get considerable variation between different cars as regards braking. We are using the same brakes in connection with the adopted scheme. Hs. | ||
| scan0047 | Secret memo discussing experiments on brake linkage ratios and modifications proposed by Mr. Royce. | ||
| View original record | X. 9940 To HS. from DA. S E C R E T. DA2/M22.5.24. E.A.C. BRAKE LINKAGE. X.9940. Referring to HS/ACL1/LG19.5.24., we agree that it is necessary to experiment to get the exact suitable ratio of braking… | ||
| scan0048 | Adopted scheme for brakes, detailing tests on servo operation with different cam angles and reduction ratios. | ||
| View original record | R.R. 493A (20H) (D.A. 652 20-3-24) J.E.D. X9940 EXPERIMENTAL REPORT. Expt. No. 9940 REF. Hs1/LG24.5.24. To R. from Hs. c. to CJ. RG. c. to DA. E. c. to BY. Wor. S E C R E T. RE. ADOPTED SCHEME OF… | ||
| scan0049 | Front braking, highlighting issues with servo adjustment and thrust washers. | ||
| View original record | R.R. 493A (20H) (D.A. 652 20-3-24) J.H.D. -2- EXPERIMENTAL REPORT. Expl. No. 9940 REF: Hsl/LG24.5.24. front braking. Our tests have shewn that there is a considerable margin for over-heating with the… | ||
| scan0050 | Issues with front axle control and potential modifications to the springing system. | ||
| View original record | To HS from R. c. to CJ. RG. DA. E. RE. FRONT AXLE CONTROL. Handwritten: X9940 RG/M26.5.24. X.9940 X.9420 X.9421. It will be noticed that this matter is not as urgent now we have decided to adopt less… | ||
| scan0051 | Defects and adjustments for the E.A.C. steering servo mechanism. | ||
| View original record | To HS. from R. S E C R E T. X9970 R4/M26.5.24. E.A.C. STEERING. X.9910. X.9940 X.9430 Regarding the adjustment of the servo, there must be something defective with the way in which this arrangement… | ||
| scan0052 | Brake system characteristics, handling, and potential material trials. | ||
| View original record | contd :- (2) (a) That the RR. brakes shall require a fair amount of foot pressure to make them operate vigorously, namely, more than the Hispano, so that dangerous braking shall not occur so easily.… | ||
| scan0053 | Secret status report on the development and production of four-wheel brakes. | ||
| View original record | To R. from DA. c. to CJ. Wor. RG. BY. Hs. S E C R E T. X9940 DA1/M27.5.24 E.A.C. 111. X.9940 X.9910 FOUR WHEEL BRAKES. The position of the work on these brakes is as follows :- (1) The adopted scheme… | ||
| scan0054 | Report page detailing findings on front braking, axle performance, wheel design, and servo speed. | ||
| View original record | centd:- -2- steering tube to be set .75 in centre. (4) Though jaggers still appear it is understood that by reducing the amount of ferodo on the shoes they can be made negligible, this reduction of… | ||
| scan0055 | Brake servo gear vibrations and noise issues. | ||
| View original record | R.R. 438a (20H) (D.A. 652 20-3-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. 9940 REF: Hs4/LG30.5.24. To R. from Hs. c. to CJ. RG. c. to DA. E. c. to BY. Wor. S E C R E T. ADOPTED SCHEME OF BRAKES. We… | ||
| scan0056 | Tests conducted to prevent brake jaggers. | ||
| View original record | R.R. 493 (40 H) (SL 42 12-7-23). J.H., D. 9940 EXPERIMENTAL REPORT. COPIES TO: (R.CJ.) BJ. WOR. By. E. Da. EP. PN. OY. (RG) Expl. No. 9940 9550 REF. HS4/LG2.6.24. OBJECT OF TEST. To prevent brake… | ||
| scan0057 | Front axle braking torque damping. | ||
| View original record | R.E. 423A (20H) (D.A. 652 20-3-24) J.E.D. EXPERIMENTAL REPORT. Expt. No. 9940 REF: Hs/ACL/LG2.6.24. EXPERIMENTS ON FRONT AXLE BRAKING TORQUE DAMPING. The apparatus was arranged as in attached print.… | ||
| scan0058 | Axle twist and 'jaggering' under various conditions of friction and braking. | ||
| View original record | R.R. 493A (20H) (D.A. 652 20-3-24) J.E.D. -2- EXPERIMENTAL REPORT. Expl. No. REF: Hs/ACL/LG2. 6. 24. jaggering became continuous, the axle would assume an initial deflection of 6º 54'., but when… | ||
| scan0059 | Diagram illustrating the design and function of an axle torque damper. | ||
| View original record | AXLE TORQUE DAMPER. ONE USED ON EACH END OF AXLE. MAX TWIST OF AXLE. 10° FRICTION PLATES. FRN. PLATE ARM PIVOT. THE AXLE IS NOT RIGIDLY HELD BUT CONSTRAINED BY THE FRICTION PLATES. AXLE ASSUMED TO… | ||
| scan0060 | Specifying the new outer brake drum (G.72554) with increased Brinell hardness for cars with four-wheel brakes. | ||
| View original record | 49240 RHS. c. Hs. c. Mr. D'Aeth. BY9/H. 3. 6. 24. LARGE OUTER BRAKE DRUMS ON CARS FITTED WITH FOUR WHEEL BRAKES. --------------------------------------- The correct outer brake drum to fit in… | ||
| scan0061 | Letter from F.H. Royce to A.W. Claremont discussing patent schemes for four-wheel brake servo systems. | ||
| View original record | X9990 Copy to CJ. HS. BJ. RG. DA. BY. S E C R E T. E. A. C. ELMSTEAD, WEST WITTERING, CHICHESTER. 3rd. June 1924. A.W.Claremont, My dear Mr. Claremont, RR. FOUR WHEEL BRAKES. X.9940 X.9910. The narrow… | ||
| scan0062 | List of modifications carried out on the adopted scheme of brakes for cars intended to run 10,000 miles. | ||
| View original record | X9940 To EY. from Hs. Hs5/LG4. 6. 24. RE. ADOPTED SCHEME OF BRAKES. X9940 [crossed out] X9941 The following is a list of modifications which have been carried out on the adopted scheme of brakes and… | ||
| scan0063 | Continued correspondence regarding instructions for stiffer shafts to reduce servo gear noise. | ||
| View original record | contd:- -2- We should be pleased to have your instructions as regards the stiffer shafts which you promised to get out for trying to overcome the noise from the servo gears. Hs. | ||
| scan0064 | Testing the efficiency of a servo with various cams. | ||
| View original record | R.R. 493 (40 H) (SL 42 12-7-23). J.H., D. [handwritten] 19940 EXPERIMENTAL REPORT. COPIES TO: R.CJ. BJ. WOR. By. E. Da. EP. PN. OY. Expl. No. 9940 9910 REF. Hs4/LG4.6.24. OBJECT OF TEST. Tests… | ||
| scan0065 | Measuring servo torque multiplication on a car. | ||
| View original record | R.R. 493A (20H) (D.A. 652 20-5-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF HS/ACL/EG3.6.24. SERVO MULTIPLICATION MEASURED ON CAR, (NO. 44-PK.) The torque multiplication of the servo was measured… | ||
| scan0066 | Servo torque multiplication with Ferodo linings. | ||
| View original record | B.R. 493A (20H) (D.A. 652 20-3-24) J.H.D. -2- EXPERIMENTAL REPORT. Expl. No. REF: Hs/ACL/LG3. 6. 24. ∴ 2.625 / 2 X 5.8 / 7.9 = B. ∴ S = 2 / 2.625 X 7.9 / 5.8 TORQUE MULTIPLICATION OF SERVO G.72550 -… | ||
| scan0067 | Adopted scheme of brakes, detailing modifications to leverage, servo operation and braking proportions. | ||
| View original record | R.E. 493A (20H) (D.A. 652 20-3-24) J.H.D. Expl. No. 9940 REF: HS3/LG4. 6. 24. EXPERIMENTAL REPORT. To R. from Hs. c. to CJ. RG. c. to DA. E. c. to BY. Wor. S E C R E T. ADOPTED SCHEME OF BRAKES. We… | ||
| scan0068 | Issues with servo brake noise, vibration, and heavy steering. | ||
| View original record | R.R. 433A (20H) (D.A. 652 20-3-24) J.H.D. -2- EXPERIMENTAL REPORT. Expl. No. 9940 REF:Hs3/LG4.6.24. The leverage we have got on the brakes is exactly the same as on the Cabriolet car when we made the… | ||
| scan0069 | Comparison table of braking specifications for various schemes. | ||
| View original record | BRAKE COMPARISONS - First Table: | BRAKING SCH. | FOOT RATIO TO REAR. | SERVO RATIO TO REAR | TOTAL TO REAR | SERVO TO FRONT | FRONT BRAKING RATIO. | REAR BRAKING RATIO. | TOTAL BRAKING | REAR BRAKING… | ||
| scan0070 | Schematic and calculation table for a servo braking system with a 55° cam. | ||
| View original record | ADOPTED SCHEME:- M. DES. 60 II N Sch. 180 SERVO G.72550 WITH 55° CAM SERVO SPEED 1/7. Diagram Labels: 7, .5, 2.5, 1.8, 2.550, 2.05, 5.8, 2.625, 6.175, 15.65, 7.85, 2.8, 3.3, 4.5, 4 S = SERVO… | ||
| scan0071 | Testing of an adopted braking scheme on a car before its departure to France. | ||
| View original record | To PN. from Hs. c. to BJ. 49940 Hs9/LG5. 6. 24 ADOPTED SCHEME OF BRAKES. 49940 49941 The first car fitted with the final scheme of brakes will be leaving for France tomorrow. It is calling at Conduit… | ||
| scan0072 | Need for owner warnings and maintenance instructions for four-wheel brakes. | ||
| View original record | To Hs. from CJ. Four Wheel Brakes. It is thought desirable to issue a warning with every chassis to which 4 wheel brakes are fitted, drawing attention to the danger of being run into behind by a car… | ||
| scan0073 | Secret memorandum detailing feedback on a car's braking and steering performance. | ||
| View original record | To HS. from R. c. to CJ. BJ. c. to RG. DA. c. to E. PN. EP. X9940 (crossed out) S E C R E T. R4/M5.6.24. RE. CAR WITH ADOPTED SCHEME OF BRAKING. X.9770 X.9940/10 PEDAL PRESSURE. The car and brakes… | ||
| scan0074 | The performance of a car's clutch, servo, and braking system. | ||
| View original record | contd: -2- long run through much water. CLUTCH. The clutch on this car (standard 40/50) was far better than on my car, because the clutch brake did not stop it so quickly. JAGGERS. I was pleased to… | ||
| scan0075 | Secret memo arranging the handover of an EAC car and discussing its braking system. | ||
| View original record | To BJ. from Hs. S E C R E T. Hs3/LG6.6.24. [Handwritten] 19940 [Handwritten] X8770 [Handwritten] 19940 [Handwritten] 19680 E.A.C. We will arrange to have the EAC. car ready at Derby on Thursday… | ||
| scan0076 | The required addition of a plain thrust washer in the O.S. steering pivot following tests of the four-wheel brake system. | ||
| View original record | To BY. from Hs. Hs3/LG11.6.24. (Handwritten) L9940 ADOPTED SCHEME OF FOURWHEEL BRAKES. (Handwritten) L9940 (crossed out) (Handwritten) X.9420 From the tests of the cars already carried out, we find… | ||
| scan0077 | Torsional damper for front axle control in four-wheel brake systems. | ||
| View original record | R.R. 498A (20H) (D.A. 652 20-8-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. 9940 9550 REF: HS3/LG16.6.24. To R. from Hs. c. to CJ. RG. c. to E. DA. c. to BY. WOR. S E C R E T. FOUR WHEEL BRAKES - AXLE… | ||
| scan0078 | Four-wheel brakes, detailing faults found during testing in France. | ||
| View original record | R.E. 493A (20H) (D.A. 652 20-3-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. 9940 9941 REF:Hs3/LG16.6.24. To R. from Hs. c. to CJ. RG. c. to E. DA. c. to BY. WOR. S E C R E T. FOUR WHEEL BRAKES. The two… | ||
| scan0079 | Page 2 of an experimental report detailing modifications to brake drums and noting issues with water boiling and steering wobble. | ||
| View original record | B.R. 493A (20H) (D.A. 652 20-2-24) J.H.D. -2- Expl. No. 9940 9941 REF. HS3/LG16.6.24. EXPERIMENTAL REPORT. left the drums .200" thick with the understanding that it would be an easy operation to get… | ||
| scan0080 | The performance, wear, and issues with four-wheel brake systems. | ||
| View original record | R.R. 493A (20H) (D.A. 652 20-3-24) J.H.D. 49940 EXPERIMENTAL REPORT. Expl. No. 9940 9941 REF: Hs4/LG16.6.24. S E C R E T. FOUR WHEEL BRAKES. To R. from Hs. c. to CJ. RG. c. to E. DA. c. to EY. WOR.… | ||
| scan0081 | Decision to turn flanges off front brake drums and the subsequent balancing procedure for the 40/50 HP chassis. | ||
| View original record | 49940 Mr. D'Arth. c. Hs. c. Bfo. (text has strikethrough) c. Wd. (text has strikethrough) BY6/H. 17. 6. 24. 40/50 HP. CHASSIS. FOUR WHEEL BRAKES. ------------------------------------- Now that it has… | ||
| scan0082 | Introduction of four-wheel brakes, including the creation of an instruction leaflet, driver warnings, and training recommendations. | ||
| View original record | X9940 To CJ. from HS. Hs4/LG17.6.24. X995 X9940 FOUR WHEEL BRAKES. Referring to CJ3/E5.6.24. A leaflet is being prepared for the Instruction Book giving particulars of the method of adjustment and… | ||
| scan0083 | Complaint of grease leaking from front hubs onto the four-wheel brakes. | ||
| View original record | R.R. 496A (20H) (D.A. 652 20-8-24) J.H.D. EXPERIMENTAL REPORT. To R. from Hs. c. to CJ. RG. c. to DA. E. c. to EY. Wor. Expl. No. 9940 265 REF: Hs3/LG18.6.24. S E C R E T. FOUR WHEEL BRAKES. We have… | ||
| scan0084 | Instruction on the correct method for greasing front hubs on cars fitted with four-wheel brakes. | ||
| View original record | To BY. from Hs. c. to BY/HEB. x9940 Hs4/LGI 8.6.24. FOUR WHEEL BRAKES. x9940 / x265 Definite instructions should be issued to the Works that on cars fitted with 4-wheel brakes, the front hubs should… | ||
| scan0085 | Recommendation against producing certain four-wheel brake levers in large numbers until more experience is gained. | ||
| View original record | To BY. from Hs. 49940 Hs7/LG18.6.24. FOUR WHEEL BRAKES. There are three levers in connection with the 4-wheel brakes which we recommend the Works do not make in large numbers. These are - the two… | ||
| scan0086 | Centre of twisting of the axle during a test with a torsional friction damper and four-wheel brakes. | ||
| View original record | X9840 To HS. from DA. S E C R E T. DA3/M18.6.24. E. A. C. TEST WITH TORSIONAL FRICTION DAMPER - X.9550 FOUR WHEEL BRAKES. X.9940. Referring to Hs/LG11.6.24., and the attempt to find the centre of… | ||
| scan0087 | Loan of an experimental car to Mr. Southern for brake testing. | ||
| View original record | X9940 To CJ. from Hs. Hs4/LG19.6.24. With reference to the attached letter from Mr. Southern dated the 3rd. ult. We think we could conveniently load to Mr. Southern an experimental car for two or… | ||
| scan0088 | Noise issues from servo gears within the four-wheel brake system. | ||
| View original record | R.R. 496A (20H) (D.A. 652 20-8-24) J.H.D. 19940 9940 Expl. No. 9910 REF: Hs3/LG19.6.24. EXPERIMENTAL REPORT. To R. from Hs. c. to CJ. RG. c. to DA. E. c. to BY. WOR. SECRET - FOUR WHEEL BRAKES. NOISE… | ||
| scan0089 | Issues with brake pedal pressure and reduction ratios. | ||
| View original record | R.R. 408A (20H) (D.A. 652 20-2-24) J.B.D. -2- 9940 Expl. No. 9910 REF: Hs3/LG19.6.24. EXPERIMENTAL REPORT. ultimate reduction, if it is coming from the worm it should alter the impulses of the drive… | ||
| scan0090 | Explaining the operation and safety characteristics of the four-wheel braking system. | ||
| View original record | 49940 To C.J. from Hs. S E C R E T. Hs2/LG1 9.6.24. FOUR WHEEL BRAKES. Answering your CJ6/E1 8.6.24. returned herewith We suggest that something like the following would cover both 'A' and 'B' :- If… | ||
| scan0091 | Continuation of a document providing advice on proper braking techniques when cornering. | ||
| View original record | contd:- -2- drivers should get into the way of always releasing the brakes when actually turning a corner. The brakes are sufficiently powerful to retard the car before the corner is reached. To use… | ||
| scan0092 | Secret memorandum enquiring about testing an oil catcher for four-wheel brakes. | ||
| View original record | X. 9940 To HS. from DA. c. to CJ. Wor. BY. S E C R E T. DA2/M21.6.24. E. A. C. FOUR WHEEL BRAKES. X. 9940. Referring to Hs3/LG18.6.24., we should like to point out that on N.sch.1780 there is shewn an… | ||
| scan0093 | The omission of an oil catcher for the four-wheel brake system and a related instruction about hub grease. | ||
| View original record | X9940 Hs. BY/C22/H. 24. 6. 24. E.A.C. FOUR WHEEL BRAKES. With reference to Da2/M. 21. 6. 24. we find that the oil catcher referred to was shown on N.Scheme 1780, but on this same scheme several… | ||
| scan0094 | Instruction to experimentally heat-treat front brake drums on E.A.C. II & E.A.C. III cars to a specific Brinell hardness. | ||
| View original record | To. RHC. c. Hs. c. Mr. D'Aeth. c. Mr. Pendlebury. X9940 E.A.C. II. & E.A.C.III. FRONT BRAKE DRUMS. Experimentally only, I wish to run the brake drums on the above cars with a Brinell of 239 to 277.… | ||
| scan0095 | Simplification of an adopted brake scheme by removing a trip from the countershaft. | ||
| View original record | X. 9940 To BY. from DA. c. to Hs. CJ. S E C R E T. E. A. C. DA4/M24.6.24. RE. ADOPTED BRAKE SCHEME. X. 9940. With reference to the question of removing the trip from the countershaft, we send herewith… | ||
| scan0096 | Front wheel brake drums be made with a higher Brinell hardness. | ||
| View original record | To EY. from Hs. X9940 Hs12/LG25.6.24. FOUR WHEEL BRAKES. We suggest that you arrange for all front wheel brake drums to be made in the higher brinnel. Hs. [Watermark: MADE AT CROXLEY] | ||
| scan0097 | Secret memo regarding an overlooked oil catcher scheme for front hubs to be fitted to all cars to resolve brake troubles. | ||
| View original record | X9940 To DA. from Hs. c. to CJ. BY. c. to Wor. S E C R E T. Hs7/LG25.6.24. FOUR WHEEL BRAKES. X.9940. X.9190. Referring to DA2/M21.6.24. The oil catcher scheme from the front hubs shewn on N.sch.1780… | ||
| scan0098 | Brake and steering tests conducted in France on two vehicles. | ||
| View original record | B.R. 495A (20H) (D.A. 652 20-2-24) J.H.D. x9940 EXPERIMENTAL REPORT. Expl. No. 9941 9940 REF: Hs5/LG26.6.24. To R. from Hs. c. to CJ. RG. c. to DA. E. c. to BY. WOR. S E C R E T. ADOPTED SCHEME OF… | ||
| scan0099 | 4-wheel brake instructions, servo output adjustments, and steering wobble issues. | ||
| View original record | R.E. 498A (20H) (D.A. 652 20-3-24) J.H.D. -2- Expl. No. 9940 9941 REF: Hs5/LG26.6.24. EXPERIMENTAL REPORT. In the instructions being got out for 4-wheel brakes we are recommending that drivers should… | ||
| scan0100 | Secret memo detailing modifications to the front brake drums and front equaliser lever. | ||
| View original record | BY. from HS. S E C R E T. [Handwritten: X9940 (crossed out)] Hs2/LG27.6.24. FRONT BRAKE DRUMS. [Handwritten: X9940 V9910 (both crossed out)] In order to reduce the tendency for jaggers, we find it… | ||
| scan0101 | Secret memo discussing issues with brake rope stretching in four-wheel brake systems and a recommendation to pre-stretch them. | ||
| View original record | X9940 To BY. from Hs. S E C R E T. X9940/1 Hs1/LCG30.6.24. FOUR WHEEL BRAKES. The cars running 10,000 miles in France are having trouble with the brake ropes stretching. We shall get considerably… | ||
| scan0102 | From R. to H.S. discussing the successful development of quiet gears for the servo drive. | ||
| View original record | To HS. from R. +9970 R2/M30.6.24. FOUR WHEEL BRAKES. X.9940 X.9910. I was very pleased to hear that you have succeeded in getting quiet gears for the servo drive. You have proved that it is not… | ||
| scan0103 | Ideal braking distribution for 4-wheel brakes. | ||
| View original record | X.9940 TO HS. from R. R3/M30.6.24. 4-WHEEL BRAKES. X.9940 I notice that you will have approximately 6 times the braking of the present standard 2 wheel brakes. I would like to point out that I have… | ||
| scan0104 | Adoption of new leather covers for rear brake adjustments. | ||
| View original record | To BY. from Hs. X9940 Hs8/LG2.7.24. RE. LEATHER COVERS FOR REAR BRAKE ADJUSTMENTS. We have heard from France that the new type leather covers on the rear brake adjustments are standing up well. They… | ||
| scan0105 | Secret memo concerning attached information on a four-wheel brake system. | ||
| View original record | X9970 To WOR } To BY. } FROM HS. S E C R E T. Hs2/LG9.7.24. FOUR WHEEL BRAKE SYSTEM. We attach herewith information in connection with the above. Hs. | ||
| scan0106 | The advantages of the four-wheel semi-servo brake system. | ||
| View original record | Hs5/LGS. 7. 24. NOTES ON ADVANTAGES OF THE RR. SYSTEM OF FOUR WHEEL BRAKES OVER OTHER KNOWN SYSTEMS. The RR. semi-servo system possesses several advantages over other systems in general use. These… | ||
| scan0107 | Typed memorandum discussing the 'lag' in servo braking systems and the advantage of bidirectional operation. | ||
| View original record | contd :- -2- is depressed, before the assistance from the servo can be felt. This we call the 'lag' of the servo between the time the pedal is pressed and the brakes are effectively applied. As an… | ||
| scan0108 | Continued description of the car's braking system, its proportions, and the plate-type servo mechanism. | ||
| View original record | contd :- -3- HS5/LGS.7.24. ------------ turning the car round on the road, it is difficult to remember when going backwards there is only approx. one-sixth the braking as when the car is going in the… | ||
| scan0109 | Adjustment instructions for the four-wheel braking system. | ||
| View original record | 49940 ADJUSTMENT OF THE RR. FOUR WHEEL BRAKING SYSTEM. The places for adjustment of the system are :- (1) REAR BRAKES. The serrated adjustment on the cam operating levers. (2) FRONT BRAKES. The… | ||
| scan0110 | Instructions for the adjustment of servo-operated front brakes, including clearance values and testing procedures. | ||
| View original record | contd :- -2- It should be borne in mind that correct pedal travel is in no way an indication that the front brakes are correctly set because these are entirely servo operated and will not influence… | ||
| scan0111 | Instructions for checking and adjusting brake and servo components. | ||
| View original record | contd :- -3- event it is possible for one lever to be on the stop and the other will then be twice its normal distance off the stop. This would give rise to error in checking the movements at the end… | ||
| scan0112 | Instructions for checking and adjusting brake pedal and servo clearances. | ||
| View original record | contd :- -4- Hs4/LGS.7.24. ------------ has been made, and before the clearance is checked. Another check for the correct clearance is the gap between the square sides of the cams when the pedal is… | ||
| scan0113 | Instructions for setting up and adjusting the four-wheel brake system. | ||
| View original record | He3/LG8.7.24. INSTRUCTIONS FOR SETTING UP AND ADJUSTING THE RR. FOUR WHEEL BRAKE SYSTEM. It is most essential in the setting up and adjusting of the RR. four wheel brake system that the following… | ||
| scan0114 | Instructions for brake adjustment, bedding, and clearance checks. | ||
| View original record | contd :- -2- HS3/LCS.7.24. ------------ Serrated adjustment. Place this in the first notch position so that the actuating lever is in its lowest position in relation to the cam. There should be 5… | ||
| scan0115 | Instructions for setting up and adjusting brake operating levers, pull ropes, and related components. | ||
| View original record | contd :- -3- operating lever should move upwards about .4" measured at its end - see drawing. When the brake operating levers, rods and pull-off springs are connected on the axle, they should be… | ||
| scan0116 | Instructions for setting up rear brakes, pull ropes, and servo mechanisms, with specific clearances. | ||
| View original record | Contd :- -4- Hs3/LG8.7.24. ---------- the amount must not exceed 1/32" and the free movement at the end of the cam operating lever must not be less than 1/4". It is advisable to jack up the wheels and… | ||
| scan0117 | Instructions on the function and adjustment of a servo mechanism, its components, and lubrication. | ||
| View original record | contd :- -5- Hs3/LG8.7.24 ----------- should work perfectly freely and accurately in the bushes because they have to transmit half of the torque given out by the servo. Every part must work quite… | ||
| scan0118 | Instructions for adjusting brake and servo systems, including clearances, pedal movement, and lever settings. | ||
| View original record | contd :- -5- Hs3/LGB.7.24 ------------------- the teeth of the serrations have to ride over each other; the minimum clearance will therefore be approx. equal to the depth of the serration. This does… | ||
| scan0119 | Confidential report on the dynamics and potential variations of the four-wheel braking system, focusing on effort distribution and the effects of maximum braking on the front axle. | ||
| View original record | CONFIDENTIAL. Hs2/LCS. 7. 24. POSSIBLE VARIATIONS OF THE RR. FOUR WHEEL BRAKING SYSTEM. As stated previously, the leverage is so proportioned that of the total braking effort - 40% goes to the front… | ||
| scan0120 | The characteristics and operation of the semi-servo braking system. | ||
| View original record | contd :- -2- It is for this reason drivers should be impressed that they should make a habit of releasing the brakes when actually turning a corner. Very efficient front brakes also increase the… | ||
| scan0121 | Page of instructions and observations regarding brake servo efficiency and fault diagnosis. | ||
| View original record | contd :- -3- HS2/LGS.7.24 ----------- If there is any noticeable variation as regards equalisatiON, or the amount of pedal pressure required, experimental test experience has been that this is most… | ||
| scan0122 | Technical note on troubleshooting brake pulling, front axle fitting, and the principles of front braking. | ||
| View original record | contd :- -5- pull to the right, it will be due to the brakes on the right-hand side of the car being more powerful than the left. Likewise, if the steering pulls to the left, it means that the… | ||
| scan0123 | Description of the four-wheel braking system. | ||
| View original record | DESCRIPTION OF THE R.R. SYSTEM OF FOUR WHEEL BRAKES. In the RR. system, all the four wheels are braked by application of the foot pedal. The hand brake operates only on the rear wheels and is exactly… | ||
| scan0124 | The operation of an improved semi-servo four-wheel braking system. | ||
| View original record | contd :- -2- effort is taken direct - through the various levers - to the rear brakes in a very similar manner to the method employed on the RR. cars with the rear brake only. This braking system is… | ||
| scan0125 | Detailed explanation of a servo-assisted braking system's operation, equalization, and adjustment. | ||
| View original record | contd :- -3- plates rotating with the drum. As seen from the sketch the tendency for these plates to rotate and carry with them lever E. will result in a pull at the end of the equaliser lever D. and… | ||
| scan0126 | The procedure and apparatus for testing servo efficiency. | ||
| View original record | TESTING THE SERVO EFFICIENCY. Apparatus for testing the efficiency of the servo can easily be fitted up to work either on the car or on the Gearbox testing rig. It is probably preferable to do the… | ||
| scan0127 | Continued instructions on testing servo efficiency, including warnings about correct procedure. | ||
| View original record | contd :- Testing servo efficiency :- Do not apply sufficient effort to the pedal to lock the rear wheels as this stops the servo rotating and if any additional pressure is applied to the servo there… | ||
| scan0128 | Instructions for drivers on the correct use of the new four-wheel brake system. | ||
| View original record | FOUR WHEEL BRAKE SYSTEM. INSTRUCTIONS TO DRIVERS. We consider it is most advisable that when a car has been fitted with 4-wheel brakes, the driver or owner of the car should be taken out on one of… | ||
| scan0129 | The principles of braking, front wheel skids, and safe driving techniques. | ||
| View original record | contd :- -2- Hsl/LGS.7.24. of a front wheel skid; Although the proportion of braking is arranged so that the rear wheels always skid first, the actual braking effect depends upon the state of the… | ||
| scan0130 | Instructions on braking techniques for cars with four-wheel brakes, including driving in snow and ice. | ||
| View original record | contd :- -3- just on the instant of the car stopping, release the brakes. If this is done, it avoids the passengers being jerked, and the car comes to rest smoothly. On cars fitted with four-wheel… | ||
| scan0131 | Confidential document discussing the dynamics and variations of a four-wheel braking system. | ||
| View original record | CONFIDENTIAL HS2/LGB. 7. 24. POSSIBLE VARIATIONS OF THE RR. FOUR WHEEL BRAKING SYSTEM. As stated previously, the leverage is so proportioned that of the total braking effort - 40% goes to the front… | ||
| scan0132 | Explanation of the semi-servo braking system's characteristics and handling implications for drivers. | ||
| View original record | contd :- -2- Hs2/LGS.7.24. It is for this reason drivers should be impressed that they should make a habit of releasing the brakes when actually turning a corner. Very efficient front brakes also… | ||
| scan0133 | Page discussing brake servo operation, fault diagnosis, and variations in pedal pressure. | ||
| View original record | contd :- -3- Hs2/LCS.7.24. -------------- If there is any noticeable variation as regards equalisation, or the amount of pedal pressure required, experimental test experience has been that this is… | ||
| scan0134 | Guide for diagnosing and correcting steering pull caused by imbalanced braking and issues with front axle components. | ||
| View original record | contd :- -4- Hs2/LGS.7.24. pull to the right, it will be due to the brakes on the right-hand side of the car being more powerful than the left. Likewise, if the steering pulls to the left, it means… | ||
| scan0135 | Notes on the advantages of the semi-servo four-wheel brake system over other known systems. | ||
| View original record | Hs5/LGS :7. 24. NOTES ON ADVANTAGES OF THE RR. SYSTEM OF FOUR WHEEL BRAKES OVER OTHER KNOWN SYSTEMS. The RR. semi-servo system possesses several advantages over other systems in general use. These… | ||
| scan0136 | Servo braking lag and its effectiveness and safety in both forward and reverse directions. | ||
| View original record | contd :- -2- is depressed, before the assistance from the servo can be felt. This we call the 'lag' of the servo between the time the pedal is pressed and the brakes are effectively applied. As an… | ||
| scan0137 | The characteristics and performance of the braking and servo system. | ||
| View original record | contd: -3- to remember when going backwards there is only approximately one-sixth the braking as when the car is going in the forward direction. The braking is proportioned so that under maximum… | ||
| scan0138 | Instructions for the adjustment of the four-wheel braking system. | ||
| View original record | ADJUSTMENT OF THE RR. FOUR WHEEL BRAKING SYSTEM. The places for adjustment of the system are :- (1) REAR BRAKES. The serrated adjustment on the cam operating levers. (2) FRONT BRAKES. The serrated… | ||
| scan0139 | Instructions for the adjustment of servo-operated front brakes. | ||
| View original record | contd: -2- pedal travel is in no way an indication that the front brakes are correctly set because these are entirely servo operated and will not influence the pedal travel. FRONT BRAKES. The only… | ||
| scan0140 | Instructions for checking and adjusting brake system clearances and the servo unit. | ||
| View original record | contd :- -3- This would give rise to error in checking the movements at the end of operating levers so to overcome this both levers on axle must be moved together when checking clearances. The front… | ||
| scan0141 | Instructions for checking and adjusting brake pedal, servo, and cam clearances. | ||
| View original record | contd:- -4- has been made and before the clearance is checked. Another check for the correct clearance is the gap between the square sides of the cams when the pedal is depressed. It should be… | ||
| scan0142 | Guide on the adjustment procedure for the four-wheel braking system. | ||
| View original record | Hs4/LG8.7.24. ADJUSTMENT OF THE RR. FOUR WHEEL BRAKING SYSTEM. The places for adjustment of the system are:- (1) REAR BRAKES. The serrated adjustment on the cam operating levers. (2) FRONT BRAKES. The… | ||
| scan0143 | Instructions for adjusting and checking servo-operated front brakes. | ||
| View original record | - 2 - Hs4/LG8.7.24. It should be borne in mind that correct pedal travel is in no way an indication that the front brakes are correctly set because these are entirely servo operated and will not… | ||
| scan0144 | Instructions for checking brake lever movements and adjusting the servo. | ||
| View original record | - 3 - Hs4/LG8.7.24. In this event it is possible for one lever to be on the stop and the other will then be twice its normal distance off the stop. This would give rise to error in checking the… | ||
| scan0145 | Instructions on checking and adjusting clearances for serrations, cams, servo, and the pedal return mechanism. | ||
| View original record | - 4 - Hs4/LGS.7.24. by the serrations. Care should be taken to see that these serrations are properly in mesh after adjustment has been made and before the clearance is checked. Another check for the… | ||
| scan0146 | Instructions for setting up and adjusting the four-wheel brake system. | ||
| View original record | INSTRUCTIONS FOR SETTING UP AND ADJUSTING THE RR. FOUR WHEEL BRAKE SYSTEM. It is most essential in the setting up and adjusting of the RR. four wheel brake system that the following instructions are… | ||
| scan0147 | Instructions for serrated adjustment, toggles, and bedding of brakes and levers. | ||
| View original record | contd :- -2- Hs3/LG8.7.24. ------------ Serrated adjustment. Place this in the first notch position so that the actuating lever is in its lowest position in relation to the cam. There should be 5… | ||
| scan0148 | Instructions for the setup and adjustment of brake operating levers and pull ropes. | ||
| View original record | contd :- -3- HS3/LG8.7.24 ----------- operating lever should move upwards about .4" measured at its end - see drawing. When the brake operating levers, rods and pull-off springs are connected on the… | ||
| scan0149 | Instructions for the setup and adjustment of rear brakes and the servo system. | ||
| View original record | Contd :- -4- Hs3/LG8.7.24. ------------ the amount must not exceed 1/32" and the free movement at the end of the cam operating lever must not be less than .4". It is advisable to jack up the wheels… | ||
| scan0150 | Instructions for the operation, lubrication, and adjustment of a servo mechanism, including details on stops and friction linings. | ||
| View original record | contd :- -5- Hs3/LG8.7.24. ----------- should work perfectly freely and accurately in the bushes because they have to transmit half of the torque given out by the servo. Every part must work quite… | ||
| scan0151 | Instructions for adjusting brake system components, including clearances, pedal movement, and lever positions. | ||
| View original record | contd :- -6- the teeth of the serrations have to ride over each other; the minimum clearance will therefore be approx. equal to the depth of the serration. This does not allow for flexibility and it… | ||
| scan0152 | The advantages of the four-wheel semi-servo brake system over other systems. | ||
| View original record | Hs5/LG8.7.24. NOTES ON ADVANTAGES OF THE RR. SYSTEM OF FOUR WHEEL BRAKES OVER OTHER KNOWN SYSTEMS. The RR. semi-servo system possesses several advantages over other systems in general use. These… | ||
| scan0153 | The operation of the servo braking system, its 'lag', and the advantages of its bidirectional functionality. | ||
| View original record | - 2 - Hs5/LG8.7.24. the assistance from the servo can be felt. This we call the 'lag' of the servo between the time the pedal is pressed and the brakes are effectively applied. As an example of the… | ||
| scan0154 | Description of the servo-assisted braking system, detailing its proportional operation and the advantages of the plate-type servo. | ||
| View original record | - 3 - Hs5/LG8.7.24. the road, it is difficult to remember when going backwards there is only approximately one-sixth the braking as when the car is going in the forward direction. The braking is… | ||
| scan0155 | Instructions for drivers on the proper use of the four-wheel brake system. | ||
| View original record | FOUR WHEEL BRAKE SYSTEM. INSTRUCTIONS TO DRIVERS. We consider it is most advisable that when a car has been fitted with 4-wheel brakes, the driver or owner of the car should be taken out on one of… | ||
| scan0156 | The dynamics of braking, front-wheel skids, and vehicle control, especially when cornering. | ||
| View original record | contd :- -2- Hs1/LG8.7.24. ------------- of a front wheel skid; Although the proportion of braking is arranged so that the rear wheels always skid xxx first, the actual braking effect depends upon the… | ||
| scan0157 | Instructions on braking techniques for cars with four-wheel brakes, including driving in snow and fitting chains. | ||
| View original record | contd :- -3- Hs1/LG8.7.24. ------------ just on the instant of the car stopping, release the brakes. If this is done, it avoids the passengers being jerked, and the car comes to rest smoothly. On cars… | ||
| scan0158 | Description of the four-wheel braking system. | ||
| View original record | P Lates DESCRIPTION OF THE R.R. SYSTEM OF FOUR WHEEL BRAKES. In the RR, system, all the four wheels are braked by application of the foot pedal. The hand brake operates only on the rear wheels and is… | ||
| scan0159 | Page 2 of a description of an improved semi-servo four-wheel braking system and its operation. | ||
| View original record | contd:- -2- effort is taken direct - through the various levers - to the rear brakes in a very similar manner to the method employed on the RR. cars with the rear brake only. This braking system is an… | ||
| scan0160 | Description of the operation and adjustment of a servo-assisted braking system. | ||
| View original record | contd:- -3- plates rotating with the drum. As seen from the sketch the tendency for these plates to rotate and carry with them lever E. will result in a pull at) the end of the equaliser lever D. and… | ||
| scan0161 | Description of the four-wheel braking system, including the servo mechanism. | ||
| View original record | DESCRIPTION OF THE R.R. SYSTEM OF FOUR WHEEL BRAKES. In the RR. system, all the four wheels are braked by application of the foot pedal. The hand brake operates only on the rear wheels and is exactly… | ||
| scan0162 | Technical description of the operation of the four-wheel semi-servo brake system. | ||
| View original record | - 2 - various levers - to the rear brakes in a very similar manner to the method employed on the RR. cars with the rear brake only. This braking system is an improved semi-servo system. It is seen… | ||
| scan0163 | Description of the operation of a vehicle's braking system, including the servo and equaliser mechanisms. | ||
| View original record | - 3 - the end of the equaliser lever D. and exert a pull in the brake ropes. The two levers A. and B. are inserted between the rod from the pedal to the rear equaliser. This is the direct pull to the… | ||
| scan0164 | The dispatch of blueprints for the four-wheel brake system. | ||
| View original record | To Wor. from Hs/LG. Y9990 Hs/LG10.7.24. FOUR WHEEL BRAKE SYSTEM. As requested, we are sending you herewith further set of blue prints in connection with the above. Hs/LG. | ||
| scan0165 | Telephone message requesting to test a car with modified front braking and springs. | ||
| View original record | 49940 TELEPHONE MESSAGE FROM BJ. TO HS. 11. 7. 24. CJ. AND BJ. HAVE BEEN CONSIDERING EAC.3. AND WOULD LIKE TO TRY A CAR WITH LESS BRAKING EFFICIENCY AND WEAKER FRONT SPRINGS, THAT IS TO SAY, REDUCE… | ||
| scan0166 | Attachment of 6 blueprints to notes on 'POSSIBLE VARIATION' for 4-wheel brakes. | ||
| View original record | To W.O.R. from Hs. X9990 Hs/LG14.7.24. Herewith 6 blue-prints which should be attached to our notes on -'POSSIBLE VARIATION' in connection with 4-wheel brakes. Hs. | ||
| scan0167 | Preliminary test and inspection findings for the 40/50 model's front wheel brakes. | ||
| View original record | 19940 c. Hs. c. [REDACTED] c. [REDACTED] for Mr. Turner. EP2/H15.7.24. re. 40/50. FRONT WHEEL BRAKES. We have now received the first of the new series chassis on test, and our preliminary tests and… | ||
| scan0168 | List of queries and issues regarding vehicle components including magneto wiring, suspension, speedometer, brakes, and steering. | ||
| View original record | - 2 - 7. The magneto wiring does not appear to be a finished off job and we should be glad if this matter could receive your attention as the wires do not appear to be properly supported, also the… | ||
| scan0169 | Confidential memo introducing notes on the adopted four-wheel brake system. | ||
| View original record | 49940 SECRET AND CONFIDENTIAL. TO - R. CJ. BJ. RG. E. DA. BY. Wor. PN. C. EP. FROM HS. Hs1/LG16.7.24. RR. SYSTEM OF FOUR WHEEL BRAKES. We attach herewith Experimental Dept. notes in connection with… | ||
| scan0170 | Experiments and implications related to fitting four-wheel brakes, focusing on spring specifications and production. | ||
| View original record | SECRET. X9940 To R. from CJ. Copy to Wor. Copy to Hs. CJ4/E17/7/24 BJ and I met Wor. and Hs yesterday, principally to discuss the four wheel brake position. As a result, on Monday, Hs. will submit in… | ||
| scan0171 | Trade-offs between adopting front-wheel brakes and maintaining the car's suspension comfort. | ||
| View original record | SECRET. To R. from CJ. The position would undoubtedly be very serious. As Wor. said: 'We should be in the devil of a mess.' We then sought for an avenue by which we could avoid this mess. BJ last week… | ||
| scan0172 | Secret memo from CJ to R concerning the adoption of front wheel brakes and the necessity of advancing radius rod control. | ||
| View original record | SECRET. To R. from CJ. He proposed to take a car so fitted for you to try after we have tried it. If we have to adopt front wheel brakes with reduced power, we may have a certain number of customers… | ||
| scan0173 | Faults and recommendations for the 40/50 HP front wheel brakes and associated components. | ||
| View original record | X9940 [smudged] c. Hs. EP7/H17.7.24. re. 40/50 HP. Front Wheel Brakes. Further to our EP2/H15.7.24. the following are a few further points for your attention:- Servo Gear Noise. The noise from the… | ||
| scan0174 | List of suggested modifications and concerns regarding brake lubrication, petrol pipe support, and wiring placement. | ||
| View original record | - 2 - EP7/H17.7.24. Brake. Is it not possible to apply some better means of lubricating the bearings of the rear foot brake equalising cross shaft (suggest lub. on shaft) Petrol pipe. Could not some… | ||
| scan0175 | Testing 12% stiffer springs and the methodology of comparing car axles for ride quality. | ||
| View original record | To BJ. from Hs. 49940 Hs8/LG1 8.7.24. 49940 (crossed out) 49910 When I arrive in London on Monday morning, I shall bring with me the 12% stiffer springs as suggested by R. We strongly recommend that… | ||
| scan0176 | 10,000 miles test in France on an adopted scheme of brakes. | ||
| View original record | R.R. 496A (20H) (D.A. 652 20-3-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. 9941 9940 REF: Hs/LC18.7.24. To R. from Hs. c. to CJ. RG. c. to DA. E. c. to Wor. BY. c. to RP. PN. S E C R E T. 10,000 MILES… | ||
| scan0177 | Front spring failures, brake performance, and steering issues on the 40/50 HP car. | ||
| View original record | R.R. 498A (20H) (D.A. 652 20-3-24) J.H.D. -2- EXPERIMENTAL REPORT. Expl. No. 9941 9940 REF : Hs7/LMS.7.24. due to the complete instructions given on the WW. scheme for the oil catcher on the front… | ||
| scan0178 | Brake wear analysis and steering spring performance. | ||
| View original record | R.R. 493A (20H) (D.A. 652 20-2-24) J.H.D. -34- Expl. No. 9941 REF: hs7/LCL8.7.24. EXPERIMENTAL REPORT. adjustment was d taken up on the front brakes. There was approximately three times the amount of… | ||
| scan0179 | Modifications to the engine and gearbox, and analysis of servo gear noise. | ||
| View original record | R.R. 498A (20E) (D.A. 652 20-3-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. 9940 9941 REF: Hs7/LG18.7.24. ENGINE MODIFICATIONS. There has been no trouble with the dynamo, dynamo drive, or magneto drive.… | ||
| scan0180 | From CJ to Hs regarding conflicting reports on the road trial testing of standard versus stiffer springs on cars with front wheel brakes. | ||
| View original record | R.R. 950 s (20 T) (S.B. 9)4. 5-9-19. G. 2470. 49940 To Hs. from CJ. Front Wheel Brakes. CJ14/E21/7/24 Last Wednesday at Bedford it was suggested that a possible way out of the difficulty which we were… | ||
| scan0181 | The hardness of rear brake drums and springs for the side steering tube on the 40/50 HP four-wheel brake chassis. | ||
| View original record | X9940 EP. C. Hs. BY/C10/H. 22. 7. 24. 40/50 HP. CHASSIS. FOUR WHEEL BRAKE. With reference to the hardness of the rear Brake Drums, please note that after the first hundred chassis, these drums will… | ||
| scan0182 | Changes to the front springing and braking systems of specific car models. | ||
| View original record | X9940 SECRET To Hs BY. from R. c. to CJ & BJ. E.A.C.3. R2/M24.7.24. X.9421.X.9940 X.9410 X.9420 Regarding the springing of these cars it will be noticed that no change is proposed to the rear of the… | ||
| scan0183 | Secret internal memo discussing unsatisfactory road springs on a car with four-wheel brakes. | ||
| View original record | To BJ. from Hs. c. to R. c. to EY. S E C R E T. +9970. Hs2/LG11.8.24. ROAD SPRINGS ON CARS FITTED WITH FOUR WHEEL BRAKES. x9710 29970 With reference to the telegram stating that 98-NK with the… | ||
| scan0184 | Testing of front wheel brake parts and springs for 4-wheel brake cars. | ||
| View original record | contd:- -2- front wheel brake parts and springs. The tests which are going forward on the London Trials Landaulet and which can, if necessary, be repeated on 107-MG, should prove this point. The… | ||
| scan0185 | Telegram discussing the demonstration of a Landaulet with front brakes and stronger springs. | ||
| View original record | ROYCAR DERBY = HIVES LONDON DEMONSTRATING LANDAULET WITH FRONT BRAKES HEAVY AXLE AND TWELVE PERCENT STRONGER SPRINGS NOT AS GOOD IN SOME RESPECTS AS PRESENT STANDARD BUT SUFFICIENTLY SATISFACTORY TO… | ||
| scan0186 | Communication regarding providing a fitter to assist with fitting 4-wheel brakes on chassis 47 LK. | ||
| View original record | [Handwritten]: Y9940 [Handwritten]: N-W. re Chassis 47 LK. In consequence of some arrangements made by "S", your Mr. Maddocks was working here on Saturday last in connection with the fitting of… | ||
| scan0187 | Alteration of cam diameters and its effect on the servo braking system. | ||
| View original record | In conformity with Da's memo, the result of the instruction issued by R. in a previous memo, we have added metal to the outside diameter of the face cams so as to increase the mean diameter from… | ||
| scan0188 | Points for consideration regarding the 40/50 HP Four Wheel Brake Cars. | ||
| View original record | Hs. By. SFT C Wor. EP/Thn6/H12.8.24. X9940 re. 40/50 HP. Four Wheel Brake Cars. The following are further points for consideration in regard to the above. 1. SILENCER We consider the exhaust to be… | ||
| scan0189 | Listing required modifications and improvements to car components. | ||
| View original record | EP/Thn6/H1.2.8.24. 4. Contd. dealt with by BY. and some modification of the present bolt head is contemplated. In the meantime it has been agreed that existing bolt heads shall be chamfered off to… | ||
| scan0190 | Stiffness of front springs in relation to car body weight and 4-wheel brakes. | ||
| View original record | To Hs. from R. c. to CJ. c. to BJ. c. to PN. X9940 S E C R E T. R1/M14.8.24 E.A.C. X9410 [crossed out] X9940 RE FRONT SPRINGS & 4-WHEEL BRAKES. It has occurred to me that the 25% stiffer front springs… | ||
| scan0191 | Standardisation sheet for four-wheel brakes on the 40/50 HP chassis. | ||
| View original record | To Hs. from BJ. BJ17/H18.8.24. 49940 FOUR WHEEL BRAKES. STANDARDISATION SHEET 9940. I attach standardisation sheets re four-wheel brakes, on the 40/50 H.P. chassis, as I expect you will wish to add to… | ||
| scan0192 | Letter requesting an official order for work on Chassis 47 LK, as it cannot be charged to a standing job number. | ||
| View original record | N-W. Hs. 49940 A4/H.22.8.24. re Chassis 47 LK. ------------------ Thank you for your Hs/LG.21.8.24. We are afraid, however, that we cannot charge the work carried out here to your standing job… | ||
| scan0193 | Chassis 47-LK, attaching a copy of another document and requesting an official order. | ||
| View original record | To Ms. from Hs. x9940 Hs1/LG23.8.24. RE. CHASSIS 47-LK. We attach copy of A21/H11.8.24. Will you kindly supply official order as requested therein. Hs. | ||
| scan0194 | Conversion of Mr. Royce's car, 6-EX, into a standard model, including the fitting of four-wheel brakes. | ||
| View original record | K9940 To Hm. from Hs. c. to Wor. Hs1/LG30.8.24. MR. ROYCE'S CAR - 6-EX. Y3923 X9940 R. wishes this car to be made into a standard EAC.111. model. We therefore propose handing this car over to the… | ||
| scan0195 | Chassis 47-LK, requesting action and the supply of an official order. | ||
| View original record | My/Rns. from Hs. Y9940 Hs/LG30.8.24. RE. CHASSIS 47-LK. In connection with the attached. We understand that previous notes have been passed along to you from Ms. Will you kindly look into this matter… | ||
| scan0196 | Requesting to retain a specific chassis with a smooth engine for demonstration work. | ||
| View original record | X9940 PN1/DN2.9.24. FROM PN TO Hs You may remember that recently when you brought a certain chassis to Gerrards Cross for BJ and others to test in respect of Front Wheel Brakes, we all decided that… | ||
| scan0197 | Clarifying a disagreement regarding the Four Wheel Brake Standardization Sheet. | ||
| View original record | X9940 HS BY1/H. 5.9.24. FOUR WHEEL BRAKES. -------------- It occurrs to me that I automatically signed the Four Wheel Brake Standardization Sheet when it was originally issued. In signing it I did not… | ||
| scan0198 | The phenomenon of front brakes thumping on a four-wheel brake system. | ||
| View original record | R.R. 493A (40 H) (SL 42 12-7-23). J.H., D. X9940 9940 EXPERIMENTAL REPORT. Expl. No. 9941 REF. Hs5/LG10.9.24. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. S E C R E T. FOUR WHEEL… | ||
| scan0199 | Resolving brake thumping and knocking issues by modifying springs and adding friction. | ||
| View original record | R.R. 493A (40 H) (SL 42 12-7-23). J.H., D. -2- EXPERIMENTAL REPORT. Expl. No. REF: Hs5/LG10.9.24. brakes are applied from the off position to the full on position. If the friction is sufficient to… | ||
| scan0200 | Proposing to send a mechanic to fix a brake thumping complaint on a 46-PK car. | ||
| View original record | To R. from Hs. c. to E. 49940 Hs3/LG12.9.24. 46-PK CAR. X.9770 X.9940 We propose sending a man to WW. next week to cure the brake thumping on the above car. The car is a bad example of this complaint… | ||
| scan0201 | Four points of action and further explanation regarding a brake thud issue. | ||
| View original record | To HS. from R. c. to CJ. x.9940 RL/M12.9.24. RE. BRAKE THUD. X.9940. Mr. Bailey has the particulars that should help you to get this right. They consist of - (1) Some friction an upper joint of… | ||
| scan0202 | Press demonstrations for new 4-wheel brakes and concerns over spring durability on French roads. | ||
| View original record | Hs To C. from CJ. Copy to PN. CWE. Hs. Wor. 49940 CJS/E16/9/24 It is very desirable that some cars should be available before the Show to give demonstrations to Press-men of the 4 wheel brakes. The 4… | ||
| scan0203 | Arrangement of cars with 6 brakes for a press demonstration before the Olympia Exhibition. | ||
| View original record | X9940 Hs To C. from JS. To PN from JS. To Hs. from JS. re 4 wheel brakes. JS2/E17/9/24 Will you please note that the following arrangement was agreed to yesterday at a conference between R, CJ., BJ.… | ||
| scan0204 | Demonstration of a new six-brake system for the Press ahead of the Motor Show. | ||
| View original record | X9940 PNG/DN19.9.24. TO Hs FROM PN c. to CJ " EP " Bgs Referring to our conversation on the 'phone today, we propose that the demonstration of our new system of six brakes shall be made to as many… | ||
| scan0205 | Ongoing issue of noisy servo gears and the steps taken to investigate it. | ||
| View original record | To Wor. from Hs. c. to EP. c. to BY. RE. NOISY SERVO GEAR. The question of the servo gear noise was taken up with R. on the very first car we fitted with the 'adopted' scheme of brakes. See our report… | ||
| scan0206 | Report page concluding that experiments have yielded modifications to reduce noise but not eliminate it entirely. | ||
| View original record | contd :- -2- was certain to arise. As a result of our experiments, we are in a position to recommend modifications which will reduce the noise but we do not know of a means of elliminating it… | ||
| scan0207 | Suitability of two cars with 4-wheel brakes for trials. | ||
| View original record | To PN. from Hs. c. to Wor. S E C R E T. Handwritten: ✓9940 TRIALS CARS. Handwritten: ✓9680 / ✓9940 With regard to the telephone message this morning asking whether we had any experimental cars fitted… | ||
| scan0208 | Organising a press demonstration for a new six-brake system before the Motor Show. | ||
| View original record | To Hs. c. to CJ. EP. Bgs. X9940 PN6/DN19.9.24. X. 9680 X. 9940 Referring to our conversation on the 'phone today, we propose that the demonstration of our new system of six brakes shall be made to as… | ||
| scan0209 | Fitting front wheel brakes to 40/50 cars for a press demonstration and issues with servo gear noise. | ||
| View original record | W/S PH. c. Hs. c. CJ. c. Bgs. c. BY. c. Wor. X9940 EP2/H20.9.24. re. 40/50 Cars with Front Wheel Brakes for Press Demonstration. With reference to your memo PN6/DN19.9.24. we are arranging to fit the… | ||
| scan0210 | Poor performance of a demonstration car, chassis 59-PK, and proposed rectifications. | ||
| View original record | L9940 PN2/DN24.9.24. TO Hs FROM PN Re Chassis No/ 59-PK. I have given this car a run with a view to finding it suitable as one of the five cars we hope to have available for the Press Demonstration on… | ||
| scan0211 | The heavy steering of a 40/50 HP car fitted with 4-wheel brakes. | ||
| View original record | -2- The steering of this car also is altogether heavier than the steering of other 40/50 HP cars fitted with 4-wheel brakes which I have recently tried at the Works. My feeling is that the steering is… | ||
| scan0212 | Servo gear noise in 40/50 HP chassis with 4-wheel brakes, and testing different gear ratios. | ||
| View original record | R.R. 493A (40 H) (SL 42 12-7-23). J.H., D. X9940 EXPERIMENTAL REPORT. Expl. No. REF: Hs4/LG24.9.24. To R. from Hs. c. to CJ. EJ. c. to RG. E. c. to DA. BY. c. to Wor. EP. SERVO GEAR NOISE. X9910 X9940… | ||
| scan0213 | Servo and worm gear arrangements to reduce noise in a car gearbox. | ||
| View original record | R.R. 493A (40 H) (SL 42 12-7-23). J.H., D. -2- Expl. No. REF Hsd/LB24.9.24 EXPERIMENTAL REPORT. 46-FK car at WW. has this arrangement of servo. We had hoped that the worm giving the 7 to 1 reduction… | ||
| scan0214 | The test of a car to investigate a 'booming' noise by substituting the axle. | ||
| View original record | X9940 PN12/DN/25.9.24. TO Hs c. c. to BJ " " EP FROM PN 59-PK. I have today tested this car again, having substituted another axle taken at random from a chassis. This was done purely to demonstrate… | ||
| scan0215 | Secret memo regarding the status of chassis 59-PK and 48-PK, including work done on 4-wheel brakes and suitability for trials. | ||
| View original record | X9940 To PN. from Hs. SECRET. Hs3/LG25.9.24. CHASSIS - 59-PK - and 48-PK. X9940 X9680 Referring to your PN2/DN24.9.24. 59-PK car was allotted to the Experimental Dept. as a completely finished car.… | ||
| scan0216 | Unsatisfactory state of chassis 59-PK and the demonstration suitability of chassis 48-PK. | ||
| View original record | X9940 PN12/DN26.9.24. TO Hs c.c. to BJ " " EP FROM PN CHASSIS 59-PK and 48-PK In reply to your Hs3/LG25.9.24, 59-PK will have reached Derby today. I am inquiring as to the origin of this car and why… | ||
| scan0217 | Internal memorandum about organising a demonstration of the 6-wheel braking system for the press. | ||
| View original record | X9940 To FH. from CJ. Copy to Hs. Copy to H. Copy to EP. Copy to Cx. Hs. CJ8/E26/9/24. The demonstration of the 6 wheel brakes on the 10th seems to me to be an occasion which should be regarded as one… | ||
| scan0218 | Tests of Firths 12 1/2 springs and brakes, noting frequent breakages of induction and extra oil pipes. | ||
| View original record | X9940 EXPERIMENTAL REPORT. COPIES TO: R.CJ. BJ. WOR. By E. Da EP. PN. OY. FG Expl. No. 9940/1 REF. Hs1/LG26.9.24. OBJECT OF TEST. Tests on Firths 12 1/2 Springs and Brakes etc. TESTER. A.J. Lidsey.… | ||
| scan0219 | Summarizing a 10,000-mile test on vehicle 9-FK. | ||
| View original record | R.R. 493A (20H) (D.A. 652 20-3-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/AJL/LG26.9.24. SUMMARY OF 10,000 MILES TEST ON 9-FK. July 30th. 1924 to Aug. 29th. 1924. Miles run. 10,221. Running… | ||
| scan0220 | Exhaust washer failures, steering performance, and engine condition including valve wear and oil consumption. | ||
| View original record | B.R. 493A (20H) (D.A. 652 20-3-24) J.H.D. -o- EXPERIMENTAL REPORT. Expl. No. REFHs/AIL/LG26.9.24 The C. and A. washer in the centre joint of the exhaust manifold has burnt out twice, causing bad… | ||
| scan0221 | Various mechanical failures and issues observed during testing. | ||
| View original record | R.R. 493A (20H) (D.A. 652 20-3-24) J.H.D. -3- EXPERIMENTAL REPORT. Expl. No. REF: Ha/AII/L.G26. 9.24. when a thicker oil is used. Extra oil pipe broke at the bend behind the carburetter. This is the… | ||
| scan0222 | Six matters requiring modification to a vehicle. | ||
| View original record | R.R. 496A (20H) (D.A. 652 20-3-24) J.H.D. -4- Expl. No. REF: Hs/AJL/1626.9.24. EXPERIMENTAL REPORT. MATTERS REQUIRING MODIFICATION. 1. Petrol tank suspension. 2. Extra oil pipe requires stiffening up… | ||
| scan0223 | Urgent completion of a Cabriolet for a 4-wheel brake demonstration. | ||
| View original record | Y9940 PN16/DN27.9.24. TO Hs FROM PN c. to EP Chassis No. 48-PK There will probably be certain drivers who will have to demonstrate the new 4-wheel brakes on October 10th, who have so far had no… | ||
| scan0224 | Arrangements for a demonstration of the Six Wheel Brakes. | ||
| View original record | X9940 PN [crossed out] c. Hs. EP6/H29.9.24. re. Demonstration of the Six Wheel Brakes on Oct. 10th. With reference to CJ's memo CJ8/E26.9.24. I shall be glad if you will let me know what arrangements… | ||
| scan0225 | Outlining the plan for a demonstration of the 6-wheel-brakes system on October 10th. | ||
| View original record | Hs. X9940 PN2/DN30.9.24. TO EP FROM PN c.c. to CJ BJ Hs Ox H DEMONSTRATION OF 6-WHEEL-BRAKES ON OCTOBER 10TH. In reply to your EP6/H29.9.24, the best plan will be for the five officials who will be… | ||
| scan0226 | Secret memo regarding sending car 48-PK for testing new springs and demonstrating 4-wheel brakes. | ||
| View original record | x9940 To BJ. from Hs. c. to Sg. S E C R E T. Hs1/LG30.9.24. BJ28/H29.9.24. x9410 x9940 x9941 We are expecting sending a Car to R. fitted with the latest type springs on Friday the 3rd. inst. This car… | ||
| scan0227 | Telegram concerning the strength of springs fitted to cars for a press demonstration. | ||
| View original record | ROYCAR DERBY = HIVES MR MORTHEY STATES THAT TEN ELEVEN AND TWELVE AU NOW FITTED WITH TWENTYFIVE PERCENT STRONGER SPRINGS ARE BEING USED ON TENTH FOR DEMONSTRATION TO SIXTY PRESS REPRESENTATIVES STOP… | ||
| scan0228 | 'Hs' to 'EP' suggesting a front axle change on the 35-PK car for a 4-wheel brake demonstration. | ||
| View original record | x9940 To EP. from Hs. Hs2/LGl.10.24. 35-PK CAR. x9680 X9940 With reference to the above car which is now in the Test Dept. and which it is proposed to use for a demonstration of 4-wheel brakes. The… | ||
| scan0229 | Providing strict instructions on maintaining secrecy about the new braking system during a press demonstration. | ||
| View original record | To FH from CJ. To Cx. from CJ. To EF from CJ. To Hs. from CJ. To H. from CJ. Braking system. Please make it clear to those who will be demonstrating brakes on the 10th instant to representatives of… | ||
| scan0230 | Secret memorandum discussing potential weakness and abnormal wear on the front brake equaliser bracket and bushes. | ||
| View original record | 49940 To HS. from DA. S E C R E T. DA3/M2.10.24. EAC.111. X.9941. X. 9370 X.4400 X. 9940 FRONT BRAKE EQUALISER. In the report of the 10,000 miles, it refers to the inside bracket of this gear being… | ||
| scan0231 | Questioning the claim of constant leverage in a four-wheel brake system. | ||
| View original record | To DA. from Hs. X9940 Hs3/LG7.10.24. FOUR WHEEL BRAKES. We should like to draw your attention to Paragraph 11. in the attached pamphlet. Do you consider this correct? We do not see how we can claim… | ||
| scan0232 | Difficulties and adjustments made to front wheel brakes. | ||
| View original record | To BY. from Hm. C. to Wor. C. to Hs. C. to EP. X9940 Hm6/W8.10.24. Re Front Wheel Brakes. On the chassis we are converting to Front Wheel Brakes we have found difficulty in getting the Brakes to clear… | ||
| scan0233 | Testing plan for front wheel brakes on car 48-PK before the Olympia show. | ||
| View original record | X9940 To GWB. from BJ. Copies to.... H. [struck through] P.H. [struck through] -> Hs. FRONT WHEEL BRAKES. How many miles do you think you could test 48-PK before Olympia opens, if you start at once?… | ||
| scan0234 | Leverage of cams in four-wheel brake systems, comparing square cams with Hispano and Perrot system types. | ||
| View original record | Y9940 To Hs. from Da. Da2/M10.10.24. FOUR WHEEL BRAKES. X.9940 X.1559 X.4214. Replying to your Hs3/LG7.10.24., the statement referred to is sufficiently true when compared with square cams and similar… | ||
| scan0235 | Congratulating staff on a successful demonstration of front wheel brakes to press representatives. | ||
| View original record | To PN. ) H. ) Cx. ) EP ) Hs. ) from B.J. BJ2/H13.10.24. X9940 I should like to congratulate those who so efficiently demonstrated the front wheel brakes to the press representatives on Friday. From… | ||
| scan0236 | Four-wheel brakes, investigating a thumping sound and proposing friction-based solutions. | ||
| View original record | R.R. 493A (20H) (D.A. 652 20-3-24) J.E.H. EXPERIMENTAL REPORT. Expl. No. X9940 REF: Hs7/LG13.10.24. To R from Hs. c. to CJ. BJ. c. to H. Dag. c. to DY. Wor. S E C R E T. FOUR-WHEEL BRAKES. With… | ||
| scan0237 | Design considerations for a 4-wheel brake system. | ||
| View original record | To HS. from R. c. to CJ. BY. X9940 R7/M16.10.24. 4-WHEEL BRAKES. X.9940 X.9910 Your memo. re. the above to hand. (1) Though we instructed friction in the top joint of the suspension link, we consider… | ||
| scan0238 | Secret memorandum discussing friction in the balancer arm suspending links for four-wheel brakes. | ||
| View original record | X.9940 To BY ) HS. ) FROM DA. c. to CJ. S E C R E T. DA3/M24.10.24. EAC.111. FOUR WHEEL BRAKES. X.9940 Referring to the question of the friction in the top of the balancer arm suspending links, we… | ||
| scan0239 | Accompanying a standardisation sheet for four-wheel brakes and updating on spring testing. | ||
| View original record | To CJ. and BJ. from Hs. +9940 [Handwritten] Hs2/LG1.11.24. X. 9940. STANDARDISATION SHEET - FOUR WHEEL BRAKES. +9940 / +9410 [Handwritten] Attached herewith is standardisation sheet for 4-wheel… | ||
| scan0240 | Requesting clarification on the interaction between the steering mechanism and brakes following a customer's query. | ||
| View original record | 49940 PN15/DN5.11.24. TO Hs FROM PN Two gentlemen today (brothers) who are undertaking the purchase of a car from us and who are also Engineers and keenly interested in the details of our mechanism,… | ||
| scan0241 | Technical memorandum explaining the front brake pull rod and equaliser mechanism during steering. | ||
| View original record | To PN. from Hs. With reference to PN15/DN5.11.24. The point you raise is one which has been carefully considered. In point of fact, when the front wheels are turned through any appreciable lock, the… | ||
| scan0242 | Technical note on the lubrication requirements and design of the front wheel brake system. | ||
| View original record | contd :- -2- R-R Front Wheel Brake Lubrication. Attention may be directed at the number of points on the R-R front wheel brake system which require lubrication. There are, however, two points which… | ||
| scan0243 | Benefits of a servo-assisted braking system and its impact on lubrication intervals. | ||
| View original record | contd :- -3- has serious difficulty in obtaining his maximum braking power by pedal pressure. The addition of a servo to the system gives such an adequate reserve of power that this factor is… | ||
| scan0244 | Common faults in 4-wheel brake systems and the R-R method of brake adjustment. | ||
| View original record | contd :- -3- R-R BRAKE ADJUSTMENT. Two common faults inherent in the majority of 4-wheel brake systems at present on the road are :- (1) After considerable alteration of the single point adjustment,… | ||
| scan0245 | Page 4 of a typed document discussing the trade-off between accessibility and efficiency. | ||
| View original record | contd :- -4- proved to be very considerable, accessibility has been somewhat sacrificed in this case to efficiency. Hs. | ||
| scan0246 | Front wheel brake details and simplifying lubrication instructions. | ||
| View original record | X9940 PN2/DN8.11.24. TO Hs FROM PN Front Wheel Brake details. Many thanks for your Hs3/LG6.11.24. It happens, more by good luck than skill, that the description I gave to the inquirer on this point,… | ||
| scan0247 | Requesting the return of a signed standardisation sheet for four-wheel brakes. | ||
| View original record | To CJ. and BJ. from Hs. X9940 Hs7/LG20.11.24. STANDARDISATION SHEET. FOUR WHEEL BRAKES. X9410 We should be pleased if you will kindly return the signed standardisation sheet for 4-wheel brakes using… | ||
| scan0248 | Instructions to coachbuilders regarding floorboard clearance for the 4-wheel brake servo stop. | ||
| View original record | To BY. from Hs. c. to EP. c. to MX. c. to Hm. 49940 Hs1/LG24.11.24. 4-WHEEL BRAKES. 49940 x9910 Special instructions should be given that the coachbuilders allow sufficient clearance between the… | ||
| scan0249 | Standardisation proposal for a new four-wheel brake system with a 60/40 rear/front braking ratio. | ||
| View original record | RR 755 (10H) (SL391 2-11-23) MP 281297 (Hs) X9940 Completed 26/11/24 STANDARDISATION of CHASSIS PARTS. Date 15.7.24. Description of Parts. FOUR WHEEL BRAKES. Origin. To improve design. Experimental… | ||
| scan0250 | Improvements to reduce heat under the floorboards. | ||
| View original record | To CJ. from Hs. x9940 Hs5/LG28.11.24. HEAT UNDER FLOORBOARDS. x819 The improvements for reducing the heat under the floorboards automatically come in with the standardisation for 4-wheel brakes. The… | ||
| scan0251 | Secret memo on modifications to stub axle pivots for Goshawk and 40/50 models with front wheel brakes. | ||
| View original record | X9940 To HS. from R. c. to CJ. BJ. c/c to RG. DA. E. SECRET. R4/M10.12.24. EAC. 2. STUB AXLE PIVOTS. X.8420 X.9940 It will be remembered that the front axle pivot bearings have always been a source of… | ||
| scan0252 | The summary of tests carried out in France on front wheel brakes. | ||
| View original record | R.R. 493 (40 H) (SL 42 12-7-23). J.H., D. X9940 EXPERIMENTAL REPORT. COPIES TO: R.CJ. BJ. WOR. By. E. Da. EP. PN. OY. Expl. No. 9940 9941 REF. Hsl/LG22.12.24 OBJECT OF TEST. Summary of tests carried… | ||
| scan0253 | Failures of spare wheel carriers, exhaust valves, and oil pipes. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. -2- Expl. No. REF: Hs1/LG22.12.24. EXPERIMENTAL REPORT. wire-netting between the driver and the windscreen because windscreens failed frequently and because… | ||
| scan0254 | Issues with crankcase expansion, petrol system contamination, and engine bearing failure due to oil loss. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. -3- Expl. No. REF Hs1/LG22.12.24. EXPERIMENTAL REPORT. the expansion of the crankcase when cars are run under full power conditions in France. We know from… | ||
| scan0255 | Summary table detailing tests conducted on EAC.11 cars in France during 1924. | ||
| View original record | SHEET 1. DETAILS OF TESTS ON EAC.11. CARS IN FRANCE. Test No. | Car. | Date of test. | Where tested. | Mileage of test. | Particulars of parts on test. 1. | 46-PK. | 2.2.24 to 11.3.24 | Southern… | ||
| scan0256 | Test report detailing troubles and their remedies for the original high-speed servo on the 46-PK car. | ||
| View original record | SHEET 2. TEST NO 1. ORIGINAL HIGH SPEED SERVO - 46-PK CAR. (Driven by PN.) TROUBLES. | CAUSE OR REMEDY. Clutch slipping. | Clutch springs too weak. Braking very inconsistent: Brake equalisation… | ||
| scan0258 | Test report sheet detailing troubles, mileage, and remedies for an original plate clutch servo on a 9-PK car. | ||
| View original record | SHEET 4. TEST NO. 111. ORIGINAL WW. PLATE CLUTCH SERVO. 9-PK CAR. TROUBLES. | MILEAGE. | CAUSE OR REMEDY. Car in accident - rear axle and petrol tank damaged, body badly damaged. | 1374 | Repaired in… | ||
| scan0259 | Log of troubles, mileage, and remedies for a 98-NK car under test. | ||
| View original record | SHEET 5. TEST NO. IV. ADOPTED SCHEME SEMI-SERVO - 98-NK CAR. TROUBLES. Brakes good and consistent. Equalisation good. F.W.B. jaggers. Servo gears noisy, become quieter with running. Front brakes… | ||
| scan0260 | Log of component failures, mileage, and remedies recorded during a vehicle test. | ||
| View original record | Contd. from Sheet 5. SHEET 6. TEST NO. IV. contd :- TROUBLES. MILEAGE. CAUSE OR REMEDY. Main cyl. extra oil pipe broken. 1433 Two side steering tube springs broken. 1488 New type springs fitted.… | ||
| scan0261 | Log of troubles, mileage, and remedies from Test No. V for a 35-PK car with an adopted semi-servo scheme. | ||
| View original record | SHEET 7. TEST NO.V. ADOPTED SCHEME SEMI-SERVO - 35-PK CAR. TROUBLES. | MILEAGE. | CAUSE OR REMEDY. Radiator top pipe broken. | 448 | Faulty casting - rad. stay too rigid. 3 side steering tube springs… | ||
| scan0262 | Troubles encountered during a test of a 35-PK car fitted with new type front springs. | ||
| View original record | SHEET 8. TEST NO. V1 AS NO.V. - BUT NEW TYPE FRONT SPRINGS - 35-PK CAR. Troubles consisted of :- 1 Exhaust Valve burnt out (old type valve). Water Pump failure (spindle badly worn( Windscreen broke.… | ||
| scan0263 | Final test report for the adopted brake scheme on the 9-PK car, detailing troubles and remedies over 11,077 miles. | ||
| View original record | SHEET 9. TEST NO. V11. FINAL TEST ON ADOPTED SCHEME OF BRAKES - 9-PK CAR. TROUBLES. MILEAGE. CAUSE OR REMEDY. Main cyl. extra old pipe broken. 2934 Steering bad for shocks and wobbles. Rapson… | ||
| scan0264 | Test report sheet detailing troubles encountered with Woodheads 20% stiffer front springs on 9-PK & 98-NK cars. | ||
| View original record | SHEET 10. TEST NO. V111. WOODHEADS 20% STIFFER FRONT SPRINGS - 9-PK & 98-NK CARS. TROUBLES. | MILEAGE. | CAUSE OR REMEDY. Servo jaggers occurred intermittently during the test. Down pipe flange broken… | ||
| scan0265 | Test report detailing failures of 12.5% stiffer front springs on car 98-NK during a bump test. | ||
| View original record | SHEET 11. TEST NO.1X. FIRTHS 12½% STIFFER FRONT SPRINGS - 98-NK CAR. Only troubles consisted of :- Frome side members cracked where RR. spare wheel carriers are fitted. N.S. front spring rear… | ||
| scan0266 | Test report log detailing troubles, mileage, and remedies for a 98-NK car with stiffer front springs. | ||
| View original record | SHEET 12. TEST NO. X. WOODHEADS 12 1/2% STIFFER FRONT SPRINGS - 98-NK CAR. TROUBLES. MILEAGE. CAUSE OR REMEDY. Brakes completely out of action. 629 Car run over branch of tree; undershield bumped up… | ||
| scan0267 | Test report on Dunlop Balloon Tyres fitted to car 98-NK, detailing issues including a broken windscreen and steering wobbles. | ||
| View original record | SHEET 13. TEST NO. Xl. DUNLOP BALLOON TYRES - 98-NK CAR. Windscreen broken - otherwise no trouble. MILEAGE 1,007 Riding comfort increased considerably, but violent steering wobbles occur at high… | ||
| scan0268 | Test report on re-designed 12½% stiffer front springs for a 9-PK car, listing faults and remedies over 10,458 miles. | ||
| View original record | SHEET 14. TEST NO. Xlll. FIRTHS RE-DESIGNED 12½% STIFFER FRONT SPRINGS - 9-PK CAR. TROUBLES. | MILEAGE. | CAUSE OR REMEDY. Main cyl. extra oil pipe broken. | 1259 | Electrical system failed. | 2361 |… | ||
| scan0269 | Letter to R-R America Inc. regarding reports on 4-Wheel brakes and their successful fitment to 100/200 cars. | ||
| View original record | X9940 Epl: Dept: Messrs. Rolls-Royce Ltd., Derby, England. 31st. Dec. 1924. R-R America Inc., Springfield, Mass., America. OY. from Hs. Enclosed herewith are reports giving particulars of 4-Wheel… | ||
| scan0270 | Use of 'Magnolia' high lead whitemetal for the bearing inside the front wheel brake drum. | ||
| View original record | Y9940 Mr. D'Aeth. c. Hs. ---------- BY10/H. 2. Z. 25. ------------------ FRONT WHEEL BRAKES. RE BEARING INSIDE BRAKE DRUM. ---------------------------- It is most important that we should continue to… | ||
| scan0271 | Conditions under which front wheel brakes might lock up or cause skidding. | ||
| View original record | 79946 PN11/DN5.2.25. TO Hs c. to BJ & CWB FROM PN FRONT WHEEL BRAKES. Are you able to say from tests you have made, under what conditions (if any) when driving along the straight, one or both of the… | ||
| scan0272 | Page 2 of a memo discussing a pressman's view on a front wheel brake incident. | ||
| View original record | -2- The Pressman in question, whom I have been with today, takes the friendly view that no accepted Rolls-Royce design would enable,in a system of front wheel brakes, the front wheels to lock,and,… | ||
| scan0273 | Customer feedback on front brake overheating on mountainous roads and questioning the design's cooling capacity. | ||
| View original record | X 9940 PN4/DN5.2.25. TO Hs ____ c. to BJ & CWB FROM PN Recently when giving a demonstration run to a young man who has a 2-seater Hispano and does a great deal of fast driving, he remarked, on our… | ||
| scan0274 | Clarifying the function and risks of the front wheel braking system and comparing it to other cars. | ||
| View original record | R.R. 493A (50B) (D.B. 175 25-9-24) J.H.D. 4940 EXPERIMENTAL REPORT. Expl. No. REF: Hs1/LG6.2.25. To PN: from Hs. c. to BJ. c. to CWB. c. to EP. S E C R E T. FRONT WHEEL BRAKES. We made it very clear… | ||
| scan0275 | Front and rear brake performance, locking issues, and endurance test results. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: hel/LGS.2.25. is relieved on the front wheels by the car bumping, there would be a tendency for the wheels to lock. If… | ||
| scan0276 | Front brake drums, explaining the decision to not use ribs for flexibility. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF Hs1/LG6. 2. 25. re-lined and the drums trued up. The front brakes may give you the impression of being hot because they are… | ||
| scan0277 | Cover letter requesting copies of Standardisation Sheets for front wheel brakes. | ||
| View original record | Hs. 49940 BY/HM4/W.17.2.25. RE FRONT WHEEL BRAKES. We attach hereto copy of a letter received from R.R. of A. and we shall be obliged if you will kindly forward copies of the Standardisation Sheets,… | ||
| scan0278 | Letter from Rolls Royce of America requesting standardisation sheets and sepia prints for front wheel brakes. | ||
| View original record | ( COPY ) ROLLS ROYCE OF AMERICA INC. SPRINGFIELD, MASS. Oy4/E-2425. February 4, 1925. Mr. Claude Johnson, Rolls Royce Ltd., London, England. Dear Sir, Re Front Wheel Brakes. -------- We should be… | ||
| scan0279 | Requesting cars fitted with four-wheel brakes to have a red triangle at the back to warn traffic. | ||
| View original record | Exp. Dept. Prod.I.D. Will you kindly arrange that any cars which are being used at the Works, fitted with four wheel brakes, are fitted with a red triangle at the back, to indicate that the/cars are… | ||
| scan0280 | The unreliability of acceleration and four-wheel brake tests published in 'The Motor' magazine. | ||
| View original record | To PN. from Hs. K9940 Hs6/LG19.3.25. ACCELERATION - FOUR WHEEL BRAKES. X1725 X9940 We hope the attached notes will be useful. We intend to let you have our reasons why we consider the tests published… | ||
| scan0281 | Variables and methodology for calculating acceleration and braking curves for a four-wheel brake system. | ||
| View original record | To PN. from Hs/Rm. Hs/Rml/LG19.3.25. ACCELERATION - FOUR WHEEL BRAKES. In reply to PN10/DN17.3.25. We are sending you some curves shewing the acceleration and braking which may be expected from an… | ||
| scan0282 | The variables affecting braking performance, including road surface friction and brake proportioning. | ||
| View original record | contd :- -2- It is most difficult to accurately estimate the co-efficient of friction between the tyre and the road surface, the more so as the surface of the road varies even from yard to yard. This… | ||
| scan0283 | Braking curves, comparing theoretical principles with published car performance data. | ||
| View original record | contd :- -3- For the braking curves below 50 m.p.h., the time to pull up from any given speed is directly proportional to the speed. The distance to pull up however, is proportional to the square of… | ||
| scan0284 | Graph of braking curves for a 40/50 model, plotting road speed against stopping distance under various braking conditions. | ||
| View original record | BRAKING CURVES 40/50 R.R. ROAD SPEED M.P.H DISTANCE TO REST. FEET A B REAR BRAKES ONLY COEFFICIENT OF FRICTION BETWEEN TYRE SURFACE & ROAD .7 A. VALUES FOR A CAR IN WHICH ALL FOUR WHEELS CAN BE… | ||
| scan0285 | Graph of braking curves showing road speed versus time to rest for a 40/50 R.R. open touring car. | ||
| View original record | BRAKING CURVES. 40/50 R.R. ROAD SPEED M.P.H. TIME TO REST. SECONDS. A B REAR BRAKES ONLY COEFFICIENT OF FRICTION. BETWEEN TYRE SURFACE & ROAD .7. A. VALUES FOR A CAR IN WHICH ALL FOUR WHEELS CAN BE… | ||
| scan0286 | Time-velocity curve for a 40/50 R.R. Open Touring car weighing 2.15 tons. | ||
| View original record | TIME VELOCITY CURVE 40/50 R.R. OPEN TOURING WT. 2.15 TONS. ROAD SPEED M.P.H. TIME SECONDS. THIS CURVE IS EVOLVED DIRECTLY FROM ACCELERATION FIGURES, COMPARING 20 H.P. & 40/50. DATED 26/2/23. | ||
| scan0287 | Brief memo concerning figures for four-wheel brakes provided on an attached sheet. | ||
| View original record | To PN. from Hs. X9940 Hs2/LG24.3.25. FOUR WHEEL BRAKES. X1725 Referring to PN2/DN23.3.25. We trust the figures given on the attached sheet are what you require. Hs. [Watermark] PARKINSON BOND | ||
| scan0288 | Table of braking test results for a four-wheel brake open touring car at various speeds. | ||
| View original record | FOUR WHEEL BRAKES. OPEN TOURING CAR. Wt. ratio Front .95 Rear 1.025 | | ALL WHEELS LOCK. | 40% BRAKING ON THE FRONT. | REAR BRAKES ONLY. | |---|---:|---:|---:|---:|---:|---:| | M.P.H. | Distance. |… | ||
| scan0289 | Criticising the acceleration and braking curves published by motoring journals. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. V9940 REF: Hs3/LG24.3.25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to PN. Wor. c. to EP. CWB. PRESS REPORTS… | ||
| scan0290 | The inaccuracy of road test performance curves published in motor papers due to unreliable speedometers. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rm1/LG21.3.25. ROAD TESTS REPORTED IN - 'THE MOTOR' AND 'THE AUTO CAR'. Recently the motor papers have taken it upon… | ||
| scan0291 | Analyzing and debunking the claimed performance data of a 45 HP Renault competitor. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. -2- EXPERIMENTAL REPORT. Expl. No. REF:HS/Rml/LG21.3.25. Where they could ensure they were not being misled by the speedometer, and Brooklands has been closed… | ||
| scan0292 | Comparing car performance data from published tests with calculated figures and independent measurements. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF. Hs/Rnl/LG21.3.25. (from the illustrations and Reg.No., is the same car as was used for 'The Motor' tests), is stated… | ||
| scan0293 | Renault acceleration curves and associated horsepower calculations. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rn2/LG21.3.25. RENAULT ACCELERATION CURVES. When any car is being driven along the road an full throttle at anything… | ||
| scan0294 | Analysis of horsepower curves and the implications for constant acceleration in a touring car engine. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/Rm2/LG21 3.25. of 'B' being inevitably concave. As concave H.P. curves usually exist for, at the most, a few… | ||
| scan0295 | Analyzing braking curves and criticizing flawed testing methods. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: HS/Rnl/LG23.3.25. ANALYSIS OF BRAKING CURVES. As we have previously pointed out, the results of braking tests are of… | ||
| scan0296 | Brake deceleration and efficiency for the 'Vermorel' car. | ||
| View original record | R.R. 493A (50M) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/RmL/LG23.3.25. On the 'Vermorel' on the other hand, the distances to rest give the following decelerations :- 10 m.p.h.… | ||
| scan0297 | Critiquing brake performance data and curves published in 'The Motor' magazine. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: Hs/Rn1/LG23.3.25. BRAKE EFFICIENCY DECN. FT/SEC² ROAD SPEED M.P.H. Underneath the curve in 'The Motor' the following… | ||
| scan0298 | The inaccuracies of 'The Motor' magazine's car braking tests. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. REF:Hs/RmL/LG23.3.25. on dry concrete, we may take it that for pull ups from 40 m.p.h. and below the retardation should be… | ||
| scan0299 | Time-velocity curve for a 40/50 Open Touring car, weighing 2.15 tons, compared with a 45 Renault. | ||
| View original record | TIME VELOCITY CURVE 40/50 R.R OPEN TOURING WT. 2.15 TONS. ROAD SPEED M.P.H. TIME SECONDS. 45 RENAULT THIS CURVE IS EVOLVED DIRECTLY FROM ACCELERATION FIGURES, COMPARING 20 H.P. x 40/50. DATED 26/2/23. | ||
| scan0300 | Comparison of braking curve graphs for Delage, Vermorel, and Lagonda cars from 'The Motor' magazine. | ||
| View original record | A. THE MOTOR 3/3/25. ROAD SPEED. M.P.H. TIMES WHICH WOULD CORRESPOND WITH DISTANCES GIVEN DATA POINTS: 14 Ft, 26 Ft, 42 Ft, 73 Ft, 130 Ft, 164 Ft. 14 H.P. SPORTS DELAGE BRAKING CURVE ROAD - TARRED… | ||
| scan0301 | Graph showing braking curves for a 40/50 model, plotting road speed against time to rest under various braking conditions. | ||
| View original record | BRAKING CURVES. 40/50 R.R. ROAD SPEED M.P.H. TIME TO REST. SECONDS. VERMOREL A. B. REAR BRAKES ONLY COEFFICIENT OF FRICTION. BETWEEN TYRE SURFACE & ROAD. .7. A. VALUES FOR A CAR IN WHICH ALL FOUR… | ||
| scan0302 | Comparative velocity curve analysis for the Bentley Speed Model and the Vermorel 12-25, critiquing data from 'The Motor' magazine. | ||
| View original record | Left Chart: THE MOTOR 3/3/25. ROAD SPEED M.P.H. TIME SECS. BENTLEY SPEED MODEL. THIS TIME VELOCITY CURVE CONSISTS OF TWO STRAIGHT LINES JOINED TOGETHER BY A CURVE. THIS IS MOST IMPROBABLE. Right… | ||
| scan0303 | Performance analysis chart for a 45 HP Renault, plotting Brake Horse Power against Engine R.P.M. | ||
| View original record | ANALYSIS OF CURVES OF ACCELERATION OF 45 H.P RENAULT GIVEN IN THE MOTOR 3 / 2 / 25 Y-Axis: CLUTCH BRAKE HORSE POWER Values: 0, 20, 40, 60, 80, 100, 120, 140, 160, 180, 200 X-Axis: ENGINE R.P.M.… | ||
| scan0304 | Modification to prevent oil from getting onto the servo faces of front wheel brakes. | ||
| View original record | [REDACTED] c. Wor. c. Hs. X9940 re. FRONT WHEEL BRAKES. With regard to the trouble of oil getting on to the servo faces and this interfering with the effectiveness of the brakes, and dealing with the… | ||
| scan0305 | Correspondence regarding overheating problems with F.W.B. chassis shipped to Australia. | ||
| View original record | X.9940 S/W BY. Sg15/BM2.4.25. RE. F.W.B. CHASSIS IN AUSTRALIA. With further reference to recent correspondence re. chassis No.47-AU - we regret to say that Dalgety's have now received a cable to the… | ||
| scan0306 | Typed memorandum regarding an investigation into an issue with 47-AU in New Zealand. | ||
| View original record | contd :- -2- already in your possession. In order to enable us to get a reply out by the weekend rate, we should like to have your recommendations by telegraph tomorrow. Pt. we believe, is still in… | ||
| scan0307 | Request for the drawing number of spring balances for front brake and servo mechanism adjustment, with a handwritten reply. | ||
| View original record | To. R.H.C. - Hs. 49240 EWT/McM5/MMC3.4.25. Will you please let us have the drawing number of the spring balances used in connection with the adjustment of front brakes and servo mechanism. N. are… | ||
| scan0308 | Carbon copy of a typed letter with handwritten instructions regarding the dispatch of drawings. | ||
| View original record | Handwritten (pencil): I must speak to Mr Beckett from a different angle O Please send three copies of the Drawing and be sure that they get the first post today Handwritten (initials): R.H.C. Stamped:… | ||
| scan0309 | Clarifying that balances were made from sketches and directing the recipient to the Millwrights Dept. | ||
| View original record | To EWT/McM. from Hs/Rm. X9940 Hs/Rm2/LG16.4.25. Referring to your EWT/McM5/MMC3.4.25. There was no drawing number for these balances, they were made from sketches. We gave these sketches to the… | ||
| scan0310 | From CJ to Wor. regarding the permanent recording of delivery dates and chassis modifications for administrative guidance. | ||
| View original record | To Wor. from CJ. 49940 49770 CJ11/E20.4.25. Referring to the attached, as the Board leave the Administration to settle the question of dates for deliveries, I do not propose to bring this memorandum… | ||
| scan0311 | Secret internal memo discussing production planning, schedules, and historical data related to various chassis series and braking systems. | ||
| View original record | SECRET. CJ3/E7.4.25. B.J. from CJ. It is hoped that we shall not have any big changes in chassis for some considerable time to come, after the V. series 40/50 and the new series of the 20 HP. with… | ||
| scan0312 | Chassis delivery delays for the EAC engine and 20HP models, and issues with time estimates from the design department. | ||
| View original record | -2- over the fabric coupling. More than 15 months will have elapsed between the first trial of the EAC. engine by PN. in the south of France and the delivery of the first EAC. chassis to London. (3)… | ||
| scan0313 | Accident with chassis 21-RM, detailing a known fault with 4-wheel brakes when applied while steering. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. X9940 EXPERIMENTAL REPORT. Expl. No. REF: Hs7/LG12.5.25. To BJ. from Hs. c. to EY. c. to Wor. c. to D/L. CHASSIS 21-RM - MRS. GORING. X9940 4117 With… | ||
| scan0314 | Front-wheel braking dangers, an overheating issue in Australia, and improving information distribution to officials. | ||
| View original record | 9940 To BJ. from Hs. Hs2/LG19.5.25. CHASSIS 21EM - MRS. GORING. 9940 XL4572 Referring to BJ/Py6/D16.5.25. The fact that Br. was not aware of the dangers of front wheel braking is not any fault of… | ||
| scan0315 | The characteristics and potential variations of the four-wheel braking system. | ||
| View original record | C O P Y. POSSIBLE VARIATION OF THE R-R FOUR WHEEL BRAKING SYSTEM As stated previously, the leverage is so proportion-ed that of the total braking effort - 40% goes to the front brakes while the… | ||
| scan0316 | Technical explanation of braking system characteristics, focusing on front brakes and semi-servo systems. | ||
| View original record | -2- turned when the axle is twisted forward, there is a risk that it will take charge and run on to full lock. It is for this reason drivers should be impressed that they should make a habit of… | ||
| scan0317 | The operation and fault diagnosis of a servo-assisted braking system. | ||
| View original record | -3- all four wheels, it would be possible. With the R.R. system, when the rear wheels lock, (which means the servo stops rotating) whatever pull is on the front brake ropes - this is maintained until… | ||
| scan0318 | Technical note regarding braking characteristics, steering pull diagnosis, and front brake setup. | ||
| View original record | -4- required on various xxxxxxxxxx cars to obtain maximum braking. It is known on cars with rear brakes only, that this occurs and as we are still using the same brakes, there is no reason for this to… | ||
| scan0319 | And comparing brake distribution percentages for different 4-wheel brake systems for India. | ||
| View original record | Y9940 To Hs. from DA. c. to R. S E C R E T. DA2/M25.5.25. I N D I A. X.5940 X.8420 X.9940 X.9910 4-WHEEL BRAKES - BRAKE DISTRIBUTION. Referring to your Hs4/LG20.5.25., we should like to point out that… | ||
| scan0320 | The principles of servo braking distribution and its variation with vehicle weight. | ||
| View original record | contd :- -2- Incidentally in the instructions given in "Hsl/LG9.7.24. for testing the EAC.3. servo efficiency "it appears that the ratio of rod loads is expected "to come within the limits given on… | ||
| scan0321 | Letter from the Institution of Automobile Engineers enclosing a library copy of a paper on 'Four Wheel Brakes'. | ||
| View original record | X.9940 The Institution of Automobile Engineers. Watergate House, York Buildings, Adelphi, London, W.C.2. TELEPHONE, REGENT 4638. TELEGRAMS, "AUTINST, WESTRAND, LONDON" H/R 29th April 1926 E. W. Hives,… | ||
| scan0322 | Request for a brake leverage diagram to investigate an issue with excessive leverage on both hand and foot brakes. | ||
| View original record | To Hs. from DA. K9940 DA3/M22.7.26. EAC.1. BRAKE GEAR. X.9940 X.9330 X.9370 With reference to the brake operation on this car the leverage appears to be too much on both hand and foot. Would you… | ||
| scan0323 | Adjustments to front wheel braking systems, proportions, servo effectiveness, and potential overbraking. | ||
| View original record | 9940 To Hs. from R. c.c. to BJ. Wor. c.c. to EY. DA. c.c. to FN? R1/M25.11.26. RE. FRONT WHEEL BRAKING, AND STEERING. X.8430 X.8420 X.9940 Regarding memo. Hs/Rnl/LG23.11.26., I quite agree, and am… | ||
| scan0324 | Policy of retrofitting front wheel brakes to older cars. | ||
| View original record | [Stamp: RECEIVED JUN 27 1927] [Handwritten: Hs X9940] To HK. from BJ For attention of Ps. Copy to Hs. BJ2/E27/6/27 Re: Front Wheel Brakes & Pre-1923 RR Cars. With reference to Ps's memo.… | ||
| scan0325 | Policy for handling repairs and spare parts for chassis fitted with non-standard front wheel brakes. | ||
| View original record | Mor.......from C. c. to Hm. Re Front Wheel Brakes not of R-R Manufacture. ----------------------- You recently raised the question of what action should be taken when you received requests for repairs… | ||
| scan0326 | Policy on fitting front wheel brakes to pre-1923 cars. | ||
| View original record | From: "Ps" To: "WH" c.c.: "HB" LONDON "HS" DERBY x9940 Ps24/RJ.23.6.27 Re: Front Wheel Brakes & Pre-1923 RR Cars I have, on one or two occasions recently, raised the question as to the advisability of… | ||
| scan0327 | The suitability of a front wheel brake model, mentioning a licensing agreement with Hotchkiss. | ||
| View original record | To Wor. from Hs. x9540 Hs2/LG23.8.27. RE. FRONT WHEEL BRAKES. x8420 This model would be of no use to us as although our brakes are made under licence from the Hotchkiss, they differ very materially.… | ||
| scan0328 | Preparation and trial of a new special speed model chassis for a 10,000 miles trial. | ||
| View original record | To Df. - from Wor. " Hs. - " " " Mr.Coverley" " CJ. informs me that it is probable that we shall be selling as a special speed model, the present chassis with the present gearbox but with the new… | ||
| scan0329 | Plan to fit a new engine to the 40/50 HP chassis and the need for a test car. | ||
| View original record | PN. from Hs. RE. 40/50 HP. CHASSIS WITH NEW ENGINE. W You will no doubt have received my memo. in which we have tried to restrain the administration from dashing into production with the new engine.… | ||
| scan0330 | Allocation of new 40/50 HP cars to individuals identified as PN and R. | ||
| View original record | X9946 Wor. from Hs. Hs6/LG20.12.23. E.A.C. CAR FOR PN. We think it is essential that if we are going to let PN. have a 40/50 HP. car with a new engine, we ought at the same time to let R. have a… | ||
| scan0331 | The preparation of a chassis with a new engine for a 10,000-mile trial. | ||
| View original record | X9946 PN5/DN/20.12.23. TO Hs. FROM P.N. C.J. writes me that he understands from Wor. that it will be possible for a chassis to be ready with the new engine in it in January, but not with the new… | ||
| scan0332 | Braking systems, high-speed servo, chassis modifications for the 40/50 model, and upcoming vehicle tests. | ||
| View original record | R.R. 950 (50H) (S.B. 849, 20-3-18) G. 2139. X9946 PN8/DN/21.12.23. TO Hs. FROM P.N. SECRET. I am entirely in sympathy with the remarks in your letter Hsl/LG20.12.23 addressed to C.J. I understand that… | ||
| scan0333 | Testing of new brakes for the 40/50 HP chassis and a comparison with Hispano brakes. | ||
| View original record | To Hs. from CJ. BRAKES. CJ6/E28.12.23. Handwritten text: X9946 (circled), X.4214, X.9940 (struck through), X9946, X.9680 Referring to your secret memo. Hsl/LG20.12.23., please let me know when you… | ||
| scan0334 | Secret memo from CJ to Hs. regarding concerns and manufacturing plans for a new engine, its relation to the Goshawk engine, and upcoming chassis tests. | ||
| View original record | SECRET. To Hs. from CJ. X 9946 X9946 X9770 CJ8/E31/12/23 1 With reference to the new engine, you say that there are parts which you think will give trouble and which need alteration and that it is not… | ||
| scan0335 | Secret memo from Hs. regarding a trip to London for a car demonstration and discussion. | ||
| View original record | X9946 PN. from Hs. S E C R E T. Hs3/LCl.1.24. On Wednesday next, (9th. inst) Rg. and myself will be in London. We are going down to WW. on Monday and Tuesday and Rg. has to call in London on our way… | ||
| scan0336 | Letter confirming a dinner meeting and providing a delivery date for a special car. | ||
| View original record | W/S PN. from Hs. 49946 Hs2/LG3.1.24. With reference to your telephonic conversation this morning. Rg. and myself will be very pleased to have Dinner with you on Tuesday night. Unless we hear to the… | ||
| scan0337 | The E.A.C. engine, including test bench results and preparations for vehicle testing. | ||
| View original record | R.R. 403A (40 H) (SL 42 12-7-23). J.H., D. X9946 EXPERIMENTAL REPORT. Expl. No. 9770 REF:Hs5/LG11.1.24. To R. from Hs. c. to CJ. RG. c. to DA. BY. c. to E. S E C R E T. E.A.C. ENGINE. X.9680 X.9770 We… | ||
| scan0338 | Engine detonation, magneto noise, and valve spring failures. | ||
| View original record | R.R. 403A (40 H) (SL 42 12-7-23). J.H., D. -2- EXPERIMENTAL REPORT. Expl. No. 9770 9680 REF: Hs5/LG11.1.24. running about, detonations have now become more pronounced especially with the magneto.… | ||
| scan0339 | Missing luggage grid, resolved stiff steering, and improving brakes for an E.A. C.11 chassis. | ||
| View original record | X9946 W/S. PN. from Hs. Hs1/LG12.1.24. E. A. C.11. CHASSIS. X9946 X9940 With reference to the car we are preparing for you to take away. I told you that there was a luggage grid fitted to this car. I… | ||
| scan0340 | Arrangement to fit a luggage grid to an experimental car. | ||
| View original record | S/W. (Hs) X9946 C/Hn1/MH16124. re: PN'S EXPERIMENTAL CAR. With reference to the Experimental car which PN. is to take to France for test purposes at the end of this month, we understand that you have… | ||
| scan0341 | The test bench results for the 3rd EAC engine, its modifications, and performance notes. | ||
| View original record | R.R. 493A (40 H) (SL 42 12-7-23). J.H., D. Y9946 EXPERIMENTAL REPORT. Expl. No. Y9946 REF: Hs1/LG19.1.24. SECRET. E.A.C. To R. from Hs. c. to CJ. RG. c. to E. DA. c. to BY. We have been running the… | ||
| scan0342 | Ignition timing and the requirement for automatic advance on various engine models. | ||
| View original record | contd:- -2- Hsl/LG1 9.1.24. we require approximately the same as we do on the 20 HP. We can obtain maximum power on the 40/50 with Magneto ignition set at 23° B.T.D.C. for the advance. On the EAC. we… | ||
| scan0343 | Trip-tyque for Italy and recommendations for brake testing on mountain roads. | ||
| View original record | PN. from Hs. Y9946 Hs2/LG26.1.24. Y9946 [crossed out] X677 We should like you to consider whether, when we obtain the trip-tyque for 46-PK, that it should include taking the car into Italy. So far it… | ||
| scan0344 | Travel documents, brake components, and testing arrangements for the P.N. Experimental Car 46-PK. | ||
| View original record | Duplicate X9946 PN1/DN/28.1.24. FROM P.N. TO Hs. P.N. EXPERIMENTAL CAR - 46-PK. In reply to your Hs1/LG26.1.24, the triptyque in respect of this car should certainly include Austria and Italy, not… | ||
| scan0345 | International travel plans, brake testing, and R.A.C. formalities for experimental car 46-PK. | ||
| View original record | X9946 PN1/DN/28.1.24. TO Hs. FROM P.N. P.N. EXPERIMENTAL CAR - 46-PK. In reply to your Hs1/LG26.1.24 the triptyque in respect of this car should certainly include Austria and Italy, not that it seems… | ||
| scan0346 | Dispatch of a Folberth Windscreen wiper for car 46-PK. | ||
| View original record | X9946 Sg/Hd/HW/28124. DERBY. Hs. Re Car 46-PK. Referring to your Hsl/LG25124, P.N.S. requested me to forward to you by the car which leaves Conduit Street daily for Derby a Folberth Windscreen wiper.… | ||
| scan0347 | Testing of car EAC-11, noting the use of temporary brakes and the need for an extended engine trial. | ||
| View original record | 49946 To CJ } FN } from HS. c. to RG. WOR. Hs2/LG28.1.24. EAC-11 CAR FOR PN. We strongly recommend that although it has been proposed to seriously modify the scheme for the brakes compared with that… | ||
| scan0348 | Outlining arrangements for car 46-PK, including departure details, body alterations, and fitting of Ferodo linings. | ||
| View original record | PN. from Hs. X9946 Hs3/LG29.1.24. 46-PK. EAC. CAR FOR PN. We are making our arrangements so that the above car will leave Derby early on Friday morning - arrive in London midday. Sandersons have made… | ||
| scan0349 | Folberth windscreen wiper which was not fitted to a car as previously thought. | ||
| View original record | W/S. Sg. from Hs. X9946 46-PK. Hs3/LG30.1.24. X9946 X4175 We have received the Folberth Windscreen Wiper. We think there must be some mistake when you say that the Wiper was fitted to the car. There… | ||
| scan0350 | Signed declaration acknowledging receipt of a bonnet key for car H6 PR and the secrecy obligations associated with it. | ||
| View original record | 49946 I have received the key of the bonnet of Car No.. H6 PR I have read CJ's memorandum of the 21st. Jan. and realise that under no circumstances whatever must I open the bonnet in the face of any… | ||
| scan0351 | Signed confidentiality undertaking regarding the key for car bonnet No. 46PK. | ||
| View original record | X9946 I have received the key of the bonnet of Car No. 46PK I have read CJ's memorandum of the 21st. Jan. and realise that under no circumstances whatever must I open the bonnet in the face of any… | ||
| scan0352 | Recommendation on lubricating the universal joint inside the clutch for the PN's Trials Car 46-PK. | ||
| View original record | W/S. Mr. Lauro C/O PN. From Hs. SECRET. PN'S TRIALS CAR - 46-PK. I am not sure whether you are aware that there is a universal joint inside the clutch on the EAC. engine which is lubricated through a… | ||
| scan0353 | Trials car, detailing engine performance on a test bench and modifications to the camshaft and cylinder head. | ||
| View original record | R.R. 493A (40 H) (SL 42 12-7-23). J.H., D. x9946 EXPERIMENTAL REPORT. Expl. No. 9680 9771 REF: Hsl/LG1.2.24. To R. from Hs. c. to CJ. RG. c. to PN. DA. c. to E. BY. c. to WOR. EP. S E C R E T. PN'S… | ||
| scan0354 | Modifications and tests on various car components including the engine, carburettor, radiator, and clutch. | ||
| View original record | R.R. 403A (40 H) (SL 42 12-7-23). J.H., D. -2- EXPERIMENTAL REPORT. Expl. No. 9680 REF: HS1/LGl.2.24. This engine has the improved oil retainer at the flywheel end and so far has given no trouble.… | ||
| scan0355 | Car's steering, suspension, performance, vibrations, and noise. | ||
| View original record | R.R. 403A (40 H) (SL 42 12-7-23). J.H.,D. -3- EXPERIMENTAL REPORT. Expl. No. 9680 REF: Hsl/LG1 2 24. The steering is EAC-1. This car is fitted with radius rods as the material for the front springs… | ||
| scan0356 | Issues with vibration, brakes, clutch, steering, and engine components on a test car. | ||
| View original record | R.R. 493A (40 H) (SL 42 12-7-23). J.H., D. -4- EXPERIMENTAL REPORT. Expl. No. 9680 REF: Hsl/LG1.2.24. This vibration may be altered when we fix the gearbox on to the engine. We consider it is a point… | ||
| scan0357 | The difficulty of achieving consistent and equal braking on all four wheels. | ||
| View original record | R.R. 403A (40 H) (SL 42 12-7-23). J.H., D. -5- EXPERIMENTAL REPORT. Expl. No. 9680 REF: Hs1/LCl.2.24. The brakes on this car worked well at times. A difficulty which we have the whole time with rear… | ||
| scan0358 | Secret memo from Hs discussing the condition of a car, specifically its brakes and shock absorbers. | ||
| View original record | W/S. PN. from Hs. X9946 S E C R E T. Hs3/LG1.2.24. We are arranging to send you copies of reports on the EAC. engine or brakes. We have not done all we should have liked to have done with the car but… | ||
| scan0359 | Letter detailing a vehicle road test from London to Abbeville, reporting on issues with brakes, power, steering, and clutch. | ||
| View original record | Abbeville (France) X9946 9nd Feb. 1924 Mr Hives Exp. Dept. Rolls-Royce Ltd Derby. Dear Sir, I reached London yesterday at about 1 p.m. without incident & subsequently Sandgate, just out-side… | ||
| scan0360 | Letter reporting on vehicle performance issues with a 40/50 model and enclosing expense sheets. | ||
| View original record | he can get power - The setting is rather rife now, so it is a bit of a riddle. However I will do my best in every way possible, & I will keep you acquainted with the job - I am enclosing Time &… | ||
| scan0361 | Issues with the turning circle, condemning the use of fitted radius rods and outlining ongoing modifications. | ||
| View original record | [Handwritten at top] X9946 To CJ. from Hs. Hs3/LG5.2.24. TURNING CIRCLE. [Handwritten next to title] X980 (struck through) X9946 With reference to the turning circle on the car we recently prepared… | ||
| scan0362 | Enclosing a copy of a letter from Mr. Northey describing a journey in a car with a new engine and four-wheel brakes. | ||
| View original record | To R. from CJ. Copy to Hs. Copy to Wor. Copy to Rg. Hs X9946 CJ8/E5/2/24 I enclose herewith copy of letter received this morning from Mr.Northey, containing a description of his journey so far on the… | ||
| scan0363 | Road test report from Paris detailing performance issues with a car's speed, steering, braking, and engine. | ||
| View original record | COPY. Hotel des Deux Mondes, 22, Avenue de l'Opera, Paris. 3rd February, 1924. CJ. Yesterday, after crossing, we stayed at Abbeville, coming on to Paris this morning. So far, the car is disappointing.… | ||
| scan0364 | Typed memo discussing work on servo brakes, specifically the condition of the ferodo lining. | ||
| View original record | -2- are to-day being worked on, I may put the iron shoes on servo if it is found that the ferodo is much worn. I hope to get away to-morrow. (Sgd) P.N. COPY | ||
| scan0365 | Steering complaint regarding a Side Steering Tube and modified suspension geometry on a client's car. | ||
| View original record | Hs. X9946 BY8-P6.2.24. PN's CAR. I would like to remark that the Side Steering Tube on the car of which Pn. complains about the steering, was the standard 40/50 since we instructed this to be fitted… | ||
| scan0366 | The 46-PK trials car, comparing speed test results and discussing modifications for steering and bodywork. | ||
| View original record | R.R. 493A (40 H) (SL 42 12-7-23). J.H., D. X9946 EXPERIMENTAL REPORT. To R. from Hs. c: to CJ. RG. c. to PN. DA. c. to E. WGR. c. to BY. Expl. No. 9630 3922 4578 X9946 REF: Hs2/L.G6.2.24. S E C R E T.… | ||
| scan0367 | Page 2 of an experimental report detailing issues with steering and braking systems. | ||
| View original record | R.R. 493A (40 H) (SL 42 12-7-23). J.H. D. -2- EXPERIMENTAL REPORT. Expl. No. 9680 3922 REF: HS2/L96.2.24. The radius rods positions are not the best for this type of steering. Also the front springs… | ||
| scan0368 | The expected speed increase from a 35% increase in power. | ||
| View original record | R.R. 403A (40 H) (SL 42 12-7-23). J.H., D. EXPERIMENTAL REPORT. Expl. No. 4578 REF: Hs/Rm/LG6.2.24. INCREASE OF SPEED TO BE EXPECTED FROM A 35% INCREASE IN POWER. The tractive resistance of a car… | ||
| scan0369 | The method for determining the tractive resistance of a touring car at 60 M.P.H. and over. | ||
| View original record | R.R. 493A (40 H) (SL 42 12-7-23). J.H., D. EXPERIMENTAL REPORT. Expl. No. 4578 REF: Hs/R m/LC26.2.24. METHOD OF DETERMINING TRACTIVE RESISTANCE OF RR. TOURING CAR AT 60 M.P.H. AND OVER. Tractive… | ||
| scan0370 | Tractive resistance and horsepower requirements for a touring car. | ||
| View original record | R.R. 403A (40 H) (SL 42 12-7-23). J.H., D. EXPERIMENTAL REPORT. Expl. No. 4578 REF: Hs/Rm/166.S.24. ∴ Tractive resistance at any speed = 23 + 3.11 (m.p.h.)² / 10 at 60 m.p.h. = 23 + 112 = 135 lbs/ton.… | ||
| scan0371 | Graph of road wheel horsepower required to propel an Open Touring 40/50 car weighing 2.15 tons at various speeds. | ||
| View original record | ROAD WHEEL H.P. REQUIRED TO PROPEL AN OPEN TOURING 40/50 AT VARIOUS SPEEDS CAR WT 2.15 TONS. E.A.C. ROAD WHEEL HORSE POWER 88.5. 40/50 ROAD WHEEL HORSE POWER 65. Max Resulting Road Speed 76 M.P.H. Max… | ||
| scan0372 | Letter responding to performance issues, offering solutions for speed, pre-ignition, and braking. | ||
| View original record | 49946 Expl: Dept: Messrs. Rolls-Royce Ltd., Nightingale Rd., Derby. England. 6th. Feb. 1924. Dear Lauro, Thanks for your letter from Paris. We are not very surprised if the car does not exceed 75… | ||
| scan0373 | Cover note forwarding an enclosed letter regarding PN's Trials Car. | ||
| View original record | HS X9946 To R. from CJ. To Hs. from CJ. Re PN's Trials Car. CJ7/E7/2/24 I enclose herewith for your information copy of further letter received from PN. CJ. Enc. Copy of letter dated 5/2/24 | ||
| scan0374 | Road test report from Paris to Beaune, detailing issues with the servo shoes, engine performance, clutch, and vibrations. | ||
| View original record | COPY. Grand Hotel de la Poste Beaune. Feb.5. Tuesday. 1924 C.J. We got away from Paris on Monday at 4 p.m. after the necessary work on car was done, and stayed at Fontainebleau. Today we drove here.… | ||
| scan0375 | Works order for a special tube and levers for a bell crank transmission for four-wheel brakes. | ||
| View original record | R.R. 615B (50T Sets.) (SE 592 13-3-18) MP 190185 Copy HS/RWC X9946 71331 WKS. ORDER No. 50974 6th February 1924. CHASSIS No. 46-PK Customer's Order No. RHC14/LS.6.2.24. Customer's No. Owner's Name… | ||
| scan0376 | Letter troubleshooting an inoperative servo, suggesting checks for fouling bolts and mentioning new levers have been sent. | ||
| View original record | X9946 Hs12/LG. 7th. Feb. 1924. Mr. Lauro C/O PN. We have heard from PN. that the servo became inoperative during the run down there and that you have changed to the cast iron shoes. It is difficult… | ||
| scan0377 | Letter confirming the dispatch of a new lever to increase brake power. | ||
| View original record | contd:- -2- Tomorrow we are sending you another lever which can be fitted to the shaft which is operated by the brake pedal. This lever will increase the power of both brakes. Yours faithfully, | ||
| scan0378 | Letter reporting on the performance and issues of a car, including engine, oil consumption, and clutch problems, during a trip in France. | ||
| View original record | Digne (France) X9946 Thursd. 7th February 1924 Mr Hives, Exp: Dept. Rolls-Royce Ltd Derby. Dear Sir, Trusting you have received my first report of the 2nd inst. I am sending the present to keep you in… | ||
| scan0379 | Report detailing issues with brakes and engine overheating during mountain driving. | ||
| View original record | it does not come to a stop, causing the gear changing to be noisy. I surmise that either the plate gets slightly distorted when heated or there may be some oil coming from the Engine causing a film of… | ||
| scan0380 | Ineffective brakes, excessive servo wear, and lower than expected top speed for trials car 46-PK. | ||
| View original record | R.R. 493A (40 H) (SL 42 12-7-23). J.H., D. X9946 EXPERIMENTAL REPORT. Expl. No. 9680 (struck out) X9946 REF: Hs3/LG8. 2. 24. To R. from Hs. c. to CJ. RG. c. to PN. EF c. to DA. WOR. c. to BY. S E C R… | ||
| scan0381 | Continued note discussing the disappointing maximum speeds of the Hawk-Northcliffe engine compared to the EAC engine. | ||
| View original record | contd:- -2- Our experience is, that maximum speeds are always disappointing on straight roads, for instance, the Hawk-Northcliffe with an engine which develops more H.P. than the EAC., on the test… | ||
| scan0382 | Letter suggesting troubleshooting steps to address the low maximum speed of car 46-PK. | ||
| View original record | X9946 Expl: Dept: Messrs. Rolls-Royce Ltd., Nightingale Rd., Derby. England. 8th. Feb. 1924. Mr. Lauro C/O PN. from Hs. With reference to the speed of 46-PK. On the stretches of road round Derby -… | ||
| scan0383 | Letter from Cannes reporting a slipping clutch and requesting additional funds for expenses. | ||
| View original record | COPY OF LETTER RECEIVED FROM - K9946 S.H. Lauro. Cannes. 9-2-24. Dear Sir, No further remarks since my last report - clutch began slipping when in the traffic out here. Mr. P.N. generally starts on… | ||
| scan0384 | Secret internal memorandum discussing design suggestions for the E.A.C. engine. | ||
| View original record | Y9946 To Hs. RG.) E. DA.) FROM R. c. to CJ. BJ. Wor. PN. BY. EP. SECRET. R3/M9.2.24. E.A.C. ENGINE. X.9680 X.9770 Y9946 Many thanks for your report (1.2.24) of the above with suggestions. COMPRESSION.… | ||
| scan0385 | C.J. to Hs. forwarding a copy of a further report from P.N. | ||
| View original record | x9946 Hs To R. from CJ. To Nor. from CJ. To Rg. from CJ. To Hs. from CJ. CJ6/E12/2/24 I enclose for your information copy of further report received from PN. CJ. Enc. Copy of letter dated 9/2/24 | ||
| scan0386 | Typed memo from Cannes detailing a car's performance over the Col de la Croix Haute and required mechanical adjustments. | ||
| View original record | COPY. Hotel Metropole Cannes. 9/2/24 CJ. We reached this place yesterday evening, coming over the Col de la Croix Haute. Snow not too bad. Ice difficult and slippery in places. The iron servo shoes… | ||
| scan0387 | Forwarding a copy of a letter concerning car PN being driven to the south of France. | ||
| View original record | X9946 To Wor. from CJ. To PN. from CJ. To Hs. from CJ. To Rg. from CJ. To E. from CJ. To EP from CJ. CJ7/E12/2/24 I enclose herewith copy of letter received from R. this morning with reference to the… | ||
| scan0388 | Commentary on PN's car, comparing its engine, steering, clutch, and brakes with other models. | ||
| View original record | COPY. La Villa Mimosa, Le Canadel, Par Le Lavandou, Var. France. Re PN's Car. Not much value now Hs. has reported to you. 9/2/24 My dear CJ., You very kindly sent me PN's letters I think it requires… | ||
| scan0389 | The concluding page of a letter signed by F.H. Royce concerning an individual named PN and their car. | ||
| View original record | COPY. - 2 - In conclusion PN. has not arrived here but I do not expect him if his car is fairly right or very wrong. I sincerely hope the former. Yours v. sincerely, (Sgd) F.H.Royce. | ||
| scan0390 | Letter discussing fuel mixture performance, a servo lever fault with a sketch, and brake adjustments. | ||
| View original record | Carmey 13/2/24 X9946 Mr. E. Howes R.R. Derby. Dear Sir, I have duly received your Memos of 6th, 7th, & 8th inst, which I have very carefully considered & noted for further action. - Replying shortly… | ||
| scan0391 | Letter detailing the testing of a car, focusing on performance issues with brakes, clutch springs, and coachwork fittings. | ||
| View original record | Referring to memo of 8th inst - I had already examined points 1, 2, 3, 5. - Points 4, 6, & 7 I have not yet had an opportunity, but I will as soon as I can - you must realise that for all it matters I… | ||
| scan0392 | 'CJ' enclosing a copy of a letter from 'PN' regarding an experimental car in the South of France. | ||
| View original record | x9946 To R. from CJ. To Hs. from CJ. To Wor. from CJ. To Rg. from CJ. To B.J from CJ. CJ2/E14/2/24 I enclose herewith for your information copy of letter received from PN with reference to the… | ||
| scan0393 | Typed report on the comparison testing of an experimental car and a Riviera model, focusing on engine, brake, and axle performance. | ||
| View original record | COPY. Hotel Metropole Cannes. 11/2/24 C.J. In view of Hives having sent 1 or 2 levers increasing the servo effect, I am awaiting their arrival before taking the Exp: car over to R., also hourly I am… | ||
| scan0394 | Competitor's engine acceleration. | ||
| View original record | X.9680 (crossed out) X9946 To R. from CJ. To Wor. To Hs. To BJ. CJ9/Ell.2.24. X.9680 (crossed out) X.4214 I enclose herewith copy of further letter received from PN. How do the Hispano people arrive… | ||
| scan0395 | Secret memorandum regarding issues with a car's servo and proportionate braking system. | ||
| View original record | X9946 To HS. from R. c. to CJ. RG. PN. E. DA. S E C R E T. R2/M15.2.24. RE. PN'S CAR AND PROPORTIONATE BRAKING. X.9880 X9946 X.9940 My impression is that PN. was braking his car with his front wheel… | ||
| scan0396 | Internal memorandum from CJ to multiple recipients forwarding a copy of a letter from PN. | ||
| View original record | HS X9680 X9940 To R. from CJ. To Hs. from CJ. To Wor from CJ. To Rg. from CJ. To BJ from CJ. CJ1/E16/2/24 I enclose herewith for your information copy of further letter received from PN. CJ. Enc. Copy… | ||
| scan0397 | Typed letter from Cannes discussing car performance, road tests, and potential sales. | ||
| View original record | COPY. Hotel Metropole Cannes. 14/2/24 C.J. I am just starting off for Le Canadel. The 10% servo lever we waited for proved useless owing to a part having been fitted and brazed in wrong position. The… | ||
| scan0398 | Chassis delay, a high-speed servo, a seized reverse-pinion, and other test updates. | ||
| View original record | TELEGRAMS METROPOLE CANNES Hôtel L'Hermitage X9946 Monte Carlo HOTEL METROPOLE Cannes HS 16.2.24 apparently from RG2 / W 13.2.24 there will be no final chassis (4 brakes) starting for France until… | ||
| scan0399 | Letter regarding a new brake lever with increased servo and a query about faulty carburation on a 40/50 HP model. | ||
| View original record | X9946 Expl:Dept: Messrs. Rolls-Royce Ltd., Derby, England. 18th. Feb. 1924. Mr. Lauro, C/O Mr. Northey, L'Hermitage Hotel, Monte Carlo. Dear Lauro, We have sent over to you another brake lever giving… | ||
| scan0400 | Car skidding into a ditch, the seizure of the reverse pinion, and the subsequent repair work. | ||
| View original record | Rolls-Royce Ltd 5 Boulevard Gambetta (France) Nice 18th February 1924 Mr Hives Rolls-Royce Ltd Derby Dear Sir, I was unable to report last Saturday, having been extremely busy - On the 14th inst. we… | ||
| scan0401 | Letter discussing car usage by Mr. Northey, expenses, and a personal request to travel due to a family emergency. | ||
| View original record | Mr Northey is actually using the other Standard Car which arrived a few days ago - Until further notice I have been instructed to make our Depot my head quarters & pick up Mr Northey, when instructed… | ||
| scan0402 | Examining steering shocks on an experimental car and proposing spring modifications. | ||
| View original record | X9946 To Hs. Da. Rg. E. } FROM R. c. to CJ. PN. EP. BY. S E C R E T. E. A. C. RE. STEERING+ X.9680(strikethrough) X.9430 X9946 I examined PN's experimental car. The shocks are the natural ones from… | ||
| scan0403 | Internal routing slip from CJ distributing a copy of a further report from PN. | ||
| View original record | Handwritten top left: Hs Handwritten top right: X9680 (struck through) X9946 To R. from CJ. (R. is struck through) To Hs. from CJ. To Wor. from CJ. (Wor. is struck through) To Rg. from CJ. (Rg. is… | ||
| scan0404 | Secret memo detailing the steering setup on a specific car following steering failures during a bump test. | ||
| View original record | To R. from Hs. c. to CJ. Wor. c. to RG. DA. c. to E. BY. c. to PN. EP. x9946 S E C R E T. Hs6/LG20.2.24. EAC. - STEERING. x9450 x9946 With reference to the steering on PN's car. This car is fitted… | ||
| scan0405 | Typed memo detailing car performance comparisons and mechanical issues in France. | ||
| View original record | COPY. Hotel Metropole Cannes 16/2/24 CJ. I left R. at Le Canadel yesterday having stayed the night at Bonnes. We discussed many things, incidentally he told me he had instructed the high-speed Servo… | ||
| scan0406 | Letter from F. H. Royce to C.J. regarding performance issues with PN's experimental car. | ||
| View original record | COPY to Wor.} from Rg. Hs. X9680 X9946 La Villa Mimosa, Le Canadel, Par Le Lavandou, Var, FRANCE. 20.2.24. My dear CJ., PN'S EXPERIMENTAL. On testing and hearing further about PN's car, I am quite in… | ||
| scan0407 | Letter detailing brake lever modifications and diagnosing a carburation fault based on engine behaviour. | ||
| View original record | Nice 21/2/24 *A980 X9946 Mr. E. Hives Exp. Dept. Rolls-Royce Derby Dear Sir, I have to hand your letter of the 18th inst. I note that you have sending a correct brake lever giving 10% increase on the… | ||
| scan0408 | Vehicle performance, maintenance adjustments, and comparative acceleration tests. | ||
| View original record | The priming lever not only I admit more fuel, but also a helpful quantity of air - With the high speed fit, apparently I have no trouble, except that machinery, if I happen to be alone on the road &… | ||
| scan0409 | Test drive report on an experimental car, focusing on the performance of its brakes and clutch. | ||
| View original record | X.9680 X9946 To HS. RG. FROM R. E. DA. SECRET. E.A.C. 111. R1/M21.2.24. c. to CJ. BJ. Wor. BY. PN. RE. PN'S EXPERIMENTAL CAR. X9946 X.9680 BRAKES. I drove this for about 16 miles over extremely bad,… | ||
| scan0410 | Vehicle performance and component feedback after a road test. | ||
| View original record | contd:- -2- ENGINE. I could not run very fast because I could not trust the roads. At 55 m.p.h. there seemed lots of acceleration. This engine seems good and has caused no trouble on the 1600 miles of… | ||
| scan0411 | Car's mileage, behavior, wear on servo shoe liners, and part fitment. | ||
| View original record | Nice Sunday 24th February 1924 Mr E. Hives. Rolls-Royce Ltd. Derby. Dear Sir, Since writing my last report of a few days ago I have nothing of importance to report - Sir P. N. saw me this morning &… | ||
| scan0412 | Letter discussing engine running issues, including erratic carburetion and misfiring, and proposing maintenance. | ||
| View original record | readjusting the slow speed lever & valve. But the carburation is still somehow erratic. I may go out with a very good running, like I did to-day, & on the way, after about 50 miles I was having… | ||
| scan0413 | Letter providing a performance report on a car after a 600-700 mile drive. | ||
| View original record | Nice 28th. February 1926 X9680 X9946 Mr E. Hives. Rolls-Royce Derby Dear Sir Hives, I am enclosing herein Time & Expenses Sheet for week ending the 23rd inst. initialed by Sir North. I have very… | ||
| scan0414 | Vehicle performance, noting issues with the brakes and spark plugs. | ||
| View original record | bad road Brakes not always reliable - Cooling system absolutely O.K. Oil " do. do. Ignition " do. do - except. that I had last night to replace the 12 K.L.G. - F.12 Plugs. by other clean plugs - as… | ||
| scan0415 | Internal memorandum discussing potential improvements and alternatives for clutch design. | ||
| View original record | To HS. ST. RG. E. DA. } c. to CJ.Wor.PN.BY. S E C R E T. CLUTCH FOR EAC'S. [Handwritten, 49680 is crossed out] 49680 49946 R7/M4.3.24. X.9480 X.4244 X.9680 X.4214 [Handwritten] 49946 Some slight… | ||
| scan0416 | Methods for making a clutch brake and the necessity of having one ready. | ||
| View original record | contd:- -2- I have gone over many ways of making a clutch brake but most of the simple ones leave the running shaft with end pressure by the spring. If my suggestions here given are not good or… | ||
| scan0417 | Car's condition and journey from Monte Carlo, detailing brake adjustments and mileage. | ||
| View original record | Digne 6th March 1924 X9680 X9946 Mr E. Hives Rolls-Royce Ltd Derby Dear Sir, Please excuse my having not sent my usual report these last few days, but I have really been so very busy up to a late hour… | ||
| scan0418 | Correspondence regarding a journey to England and enclosing expense sheets. | ||
| View original record | I hope that we shall be able to complete the journey to England without any incident - I do not know when I shall be reaching Derby as that depend on Mr P.F.'s plans & business - but I presume that it… | ||
| scan0419 | Secret memo discussing E.A.C. engine mounting variations, correcting a previous statement and detailing retard vibration issues. | ||
| View original record | x9946 To E. from Hs. c. to R. c. to CJ. SECRET. Hs3/LG1.4.24. E. A. C. ENGINE. x9550 (crossed out) x9680 x9946 With reference to E1/M14.3.24. You state that the only EAC. engine we have yet tried in a… | ||
| scan0420 | Secret internal memo regarding the E.A.C. engine mounting, discussing design variations and vibration issues. | ||
| View original record | [Handwritten at top: X9680 (crossed out) X9946] To E. from Hs. c. to R. c. to CJ. SECRET. Hs3/LGl.4.24. E. A. C. ENGINE. [Handwritten above: X9946 (underlined) X9550 (crossed out)] With reference to… | ||
| scan0421 | Taking a 40/50 HP model with a 4-wheel brake system to the Grand Prix and its preparation. | ||
| View original record | X9946 PN8/DN/17.6.24. TO Hs. FROM PN. CJ. agrees with me that it would be very useful from various aspects if I were to take one of our 40/50 HP models, having our complete system of 4-wheel brakes,… | ||
| scan0422 | Secret memo discussing car modifications for the Grand Prix and options for other available models. | ||
| View original record | X9946 To PN. from Hs. S E C R E T. Hs1/LG18.6.24. Referring to PN8/DN17.6.24. We suggest that the car you take to the Grand Prix should be fitted with the latest scheme of 4-wheel brakes, but also… | ||
| scan0423 | Typed memo discussing the repainting of car parts and the allocation of a specific vehicle. | ||
| View original record | contd:- -2- We shall not damage the body-work doing this work but the front axle and steering parts would have to be repainted. The only car which we have at all reasonable is one you took to France… | ||
| scan0424 | Selecting a 40/50 HP car with new four-wheel brakes for a press demonstration in France for the Grand Prix. | ||
| View original record | X9946 PN4/DN/19.6.24. TO Hs. FROM PN. In reply to your Hsl/LG18.6.24 and referring to our conversation on the 'phone this morning, it would not be suitable for the purpose we have in mind in taking a… | ||
| scan0425 | Secret memo regarding a car being prepared for the French Grand Prix and for Press runs. | ||
| View original record | To CJ. from Hs. SECRET. X9946 Hs3/LG25.6.24. E. A. C. X9946 With reference to the attached letter from Mr. Massac Buist dated 20th.inst. We are preparing a car for PN. which he proposed to take to the… | ||
| scan0426 | Car arrangements for a trip to France, discussing vehicle specifications and the opportunity to test stronger springs. | ||
| View original record | S/W. Mr.Hives. X9946 CWB5/MH23.7.24. I understand that there is to be some alteration in the arrangement made for PN's visit to France with the F.W.B. car, of which you are probably aware. In any case… | ||
| scan0427 | Forwarding the first three daily reports for a F.W.B. Cabriolet on trial in France. | ||
| View original record | S/W. HS from H. X9946 H2/EP/22.8.24. Re:- F.W.B. Cabriolet on trial in France. Please see attached the first three daily reports from my driver Henning, who is driving this car for a number of miles… | ||
| scan0428 | Road test report from J. H. Henning detailing a journey to Paris and the performance of the vehicle. | ||
| View original record | Henning's report from Paris. BJ. Paris, Sunday August 17, 1924 As requested yesterday, after meeting Mr. G. H. Baillie at the R.A.C. and receiving papers and instructions from Mrs. Baillie, I drove to… | ||
| scan0429 | Road test report from J.H. Henning on a journey from Paris. | ||
| View original record | BJ. Henning's first report from France. Hotel D'Angleterre BOURGES. Monday August 18, 1924. We started from Paris this morning in a S.W. gale with frequent heavy showers, real drenchers. We were going… | ||
| scan0430 | Test drive report from France detailing vehicle performance on hills and in wet weather. | ||
| View original record | BJ. Henning's report from France. Roanne. Tuesday August 19, 1924 We did 193 miles to-day, wet weather. We climbed hills of steep gradient of ½ mile long on second on route 81 between Thiers and… | ||
| scan0431 | Front spring failure which caused an accident to a 48-PK car in France. | ||
| View original record | R.E. 403A (20H) (D.A. 652 20-3-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. 9946 REF: HWS/LDD/2.9.24. X9946 To H. from Hs. c. to CJ. HJ. c. to HD. HY. c. to H. Ds. c. to Wor. S E C R E T. ACCIDENT TO… | ||
| scan0432 | Vehicle's braking issues, noting a pull to the right after spring replacement. | ||
| View original record | R.E. 493A (20H) (D.A. 652 20-3-24) J.H.D. -2- EXPERIMENTAL REPORT. Expl. No. 9946 REF: We suggest, when the springs were changed, which was done during the Works Holiday, that the 1 3/4% springs and… | ||
| scan0433 | Accident report concluding a broken spring centre bolt was the cause, not the 4-wheel brakes. | ||
| View original record | contd :- -3- We consider that from the 19th. to the 25th. the car was run with the centre bolt broken and the front spring was not properly held. From the evidence we cannot attribute the accident to… | ||
| scan0434 | Diagram illustrating a broken centre bolt on a front spring assembly. | ||
| View original record | BROKEN CENTRE BOLT ON FRONT o/s SPRING 48 P.K. (27.8.24) Packing plate slipped out of place. Spring Clips Loose. FRONT END of Spring 2nd & 3rd spring leaves slipped out of place. Bolt Sheared here.… | ||
| scan0435 | Diagram illustrating the failure of a broken centre bolt on a front spring assembly. | ||
| View original record | BROKEN CENTRE BOLT ON FRONT o/s SPRING 48 P.K. (27.8.24) packing plate slipped out of place Spring clips loose FRONT END of Spring 2nd & 3rd Spring leaves slipped out of place. Bolt Sheared here. (Top… | ||