Rolls-Royce Archives
| Identifier | Entry | ||
| Scan001 | The relationship between front wheel braking systems and the geometry of true pivotal steering. | ||
| View original record | FRONT WHEEL BRAKES AND TRUE PIVOTAL STEERING. [16546.]—I venture to think there is a slight error in your article on back and front wheel braking (page 180, February 11th). It is surely obvious that… | ||
| Scan002 | Published letter to the editor discussing the merits of true pivotal steering, with a diagram and an image of a Rudge-Whitworth wheel. | ||
| View original record | FRONT WHEEL BRAKES AND TRUE PIVOTAL STEERING. [16600.]—With reference to your editorial note at the conclusion of my letter [16554] in The Autocar of February 18th, Mr. Hubert Woods used exaggerated… | ||
| Scan003 | Technical discussion in the form of two letters regarding the design of front wheel brakes and pivotal steering. | ||
| View original record | FRONT WHEEL BRAKES AND TRUE PIVOTAL STEERING. [16722.]—In answer to Mr. Pugh's letter [16656], in which he states that he could not understand the second paragraph of my letter [16617] in your issue… | ||
| Scan004 | Departmental memo suggesting alterations to rear brakes to prevent them from sticking due to water and mud. | ||
| View original record | R.R. 3489 (100 H) (F 861. 25.2.10) E.P. 6138. DEPARTMENTAL MEMO. Issued Mar 18.1911 H1021 This column is for Name of Person addressed. DATE. Re. Rear Brakes. N.t.W. 17.3.11. I suggest that some… | ||
| Scan005 | Instruction regarding special larger covers for brake drums on wheels. | ||
| View original record | N2/L201011 58/4 October 20th 1911 Mr. Bailey 20-10-11 Re Covers for brake drums on wheels. ------------- Will you please arrange to instruct that special covers have a slightly larger diameter for… | ||
| Scan006 | Two proposed schemes for the length of the brake hand lever and gear. | ||
| View original record | See Mr Maclure's Recent note on Mr Karlsson Sheet dated 8.2.12. Re length of brake hand lever. TBB8/L15212. Mr Bailey. 15/2/12. Will you kindly get out two schemes of brake hand lever and gear in… | ||
| Scan007 | Suggestion to try a different fabric lining for the footbrake, instead of Ferodo. | ||
| View original record | X83 Re fabric lining to Footbrake. Mr Bailey 24/10/12. TBB10/L241012. It is suggested that we should try fabric similar to that which was found to be most suitable in our plate clutches, instead of… | ||
| Scan008 | The design and condition of the brakes, propeller shaft, and universal joints. | ||
| View original record | Wor/Hy1/L241113. Sheet.9. Both brakes are on the rear wheels, the foot brakes being contracting steel bands 2 1/4" wide and lined with fabric, and the hand brakes are expanding brass rings similar to… | ||
| Scan009 | The investigation of uneven wear on rear wheel foot brake liners following tests. | ||
| View original record | From:Exp. Dept. Copies for: J. R. By. Ha. X.353 Wor/Hyl/L22614. August 22nd. 1914. REPORT ON REAR WHEEL FOOT BRAKES. Since writing the report Wor/Hyl6/L20814 we have removed the brake drums from the… | ||
| Scan010 | Suggestion to test rear brakes by attaching a rolled steel rim to a sheet metal disc centre. | ||
| View original record | COPY. To By from R. Copy to J. " " Na. " " Wor. for Hy. 19/6/15 COPY R5/IB15615. June 15th.1915. Re Rear Brake Drums. I have suggested that we tested some rear brakes made by attaching a rolled rim of… | ||
| Scan011 | Extract detailing modifications to the back axle and brakes on experimental cars to reduce weight. | ||
| View original record | X.3458. Extract from ER/G1.5.19. (10) BACK AXLE AND BRAKES. - It is understood that some parts have been removed from the back axle, such as distance tubes etc. to reduce weight, and that the… | ||
| Scan012 | Requesting the standardization of a small stud to prevent outer brake shoe springs from fouling the inner brake drum. | ||
| View original record | R.R. 235a 20-T) (S F 673. 22-5-19) (G. 2676. E7C Mr. Clough from BY/Btn. c. Mr. Roscoe. BY/Btn15/P27.8.19. RE OUTER BRAKE SHOE SPRINGS. X.3458 With reference to the trouble which is usually… | ||
| Scan013 | Recommending an increase in clearance for the Brake Rope Connections on the 40/50 Chassis. | ||
| View original record | To DY. from EH. c. to LH. c. to De. c. to E. X.3458 EHL/LG29.8.19. 29th. Aug. 1919. BRAKE ROPE CONNECTIONS ON 40/50 CHASSIS. With reference to Mr. Elliott's note E6/G1.8.19., in which he says that Mr.… | ||
| Scan014 | Prevention of oil leakage to the brakes from the back axle by fitting diaphragms. | ||
| View original record | To Ba. from Bn. c. to Hs. X3652 Bn3/W22919. RE PREVENTION OF OIL LEAKAGE TO BRAKES FROM BACK AXLE. I attach copy of RS/G27819 which apparently should have been sent to you in the first place. In the… | ||
| Scan015 | Prints for making three experimental sets of a proposed oil catcher for the rear axle of a 40/50 chassis. | ||
| View original record | To H.R.C from D.A. To Mr. [text struck through] C. to Mr. [text struck through] C. to [text struck through] C. to Ck. X.3532 DA/STT/LF23/9/19. 40/50 Chassis - Proposed Oil Catcher for Near Axle.… | ||
| Scan016 | Issues with rear axle brake lubrication and arguing against American suggestions to remove lubricators. | ||
| View original record | X.3458 B.H. from E.P. c. to E.H. c. to C.Y. c. to Mr. Walker. c. to P.T. EP14/F29.1.20. (Handwritten: X3458, X3614, XP6) RE. LUBRICATION OF REAR AXLE BRAKE MECHANISM. In one of the American conference… | ||
| Scan017 | Lubrication of the rear axle brake mechanism and the potential use of oilless bearings. | ||
| View original record | R.R. 235a (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/13. X.3458 To EB. from Bn. Copy to Hs. " " [REDACTED] " " [REDACTED] " " [REDACTED] " " Ck. Bn6/W11. 2. 20. X3458 Re Lubrication of Rear Axle Brake… | ||
| Scan018 | Lubrication issues with the rear axle brake mechanism and a proposal for improvement. | ||
| View original record | X3457 C. to HS. C. to RY. EP/T24/F13.2.20. RE. LUBRICATION OF REAR AXLE BRAKE MECHANISM. -------------------------------------- I have noted yours ref. Bn6/W11.2.20. The question of attention being… | ||
| Scan019 | Extract listing future schemes and improvements for starter and ignition systems. | ||
| View original record | R.R. 225A 100 T) (S.H. 158, 11-8-20) G. 1500 X3532 Extract from RG/G7.9.20. In addition to our own starter and ignition schemes we now have for the immediate future:- X.295. (1) Smith dynamo cutting… | ||
| Scan020 | Letter to Ferodo Limited regarding the co-efficient of friction for 9L brake and clutch material. | ||
| View original record | X 3458 copy Ms. Hs. Hs MAR 7 1921 RECEIVED BY10-P7321. X 3422 X 3458 Messrs. Ferodo Limited., Sovereign Mills, CHAPEL-EN-LE-FRITH. March 7/21. Monday. Attention of Mr Herbert Frood. Dear Sir., REAR… | ||
| Scan021 | Letter confirming an order for 250 sets of Brake Shoe Facings made from the latest Ferobestos material. | ||
| View original record | BY10-P7321. contd. - 2 - In view of the foregoing therefore, we are of the opinion that you should go ahead and complete our order for R. series, that is, 250 sets of Brake Shoe Facings in your latest… | ||
| Scan022 | Test results for Ferodo brake material without brass wire, noting a lower co-efficient of friction. | ||
| View original record | X 3458 To BY. from Hs. Hsl/LG2. 3. 21. X 3422 FERODO FOR Your REAR BRAKES. X.3458 With reference to the Ferodo material for the rear brakes without the brass wire, we have lately been carrying out… | ||
| Scan023 | Acceptable gap for loose wheel flanges with reference to Goodyear and Dunlop specifications. | ||
| View original record | R.R. 199 (250 T) (SD676 19-7-17) MP180865 x3458 Hs. from BY. C EP. RECEIVED APR 5 x3458 x4050 x8725 FRONT AXLE - REAR HUB & BRAKE. DUNLOP WHEELS SUITABLE FOR STRAIGHT SIDED TYRES. BY6-P5.4.21. With… | ||
| Scan024 | Faulty working brakes, specifically the seizing of the rear axle mechanism and related lubrication issues. | ||
| View original record | X.3458 c.c. to Mr. [illegible] c. to Hs. c. to L. EP1/F25.4.21. A.T. X3458 RE. FAULTY WORKING BRAKES. During the last few months we have had a considerable number of complaints from our Depots of the… | ||
| Scan025 | Squeaking brake mechanisms, attributing the fault to over-lubrication of the guide pins. | ||
| View original record | -2- I do not feel that the fault is entirely on post-war cars, but it has always been a general one. Apart from the above we have also complained of squeaking of this brake mechanism, which, as… | ||
| Scan026 | Brake polishing issues and proposing tests with a new brake material and annealed brake drums. | ||
| View original record | R.R. 935c (to T.) (S.H. 988. 22/2/21.) Bm. 5988/5. Hs. from BY. X.3458 X2714 X3458 Stamp: BY2-P/10.8.21. CHASSIS - REAR HUB & BRAKE. Referring to Ph's remarks in regard to the brakes becoming more… | ||
| Scan027 | Footbrake glazing issues on the 40/50 chassis, proposing a new annealing treatment for brake drums. | ||
| View original record | H.R. 2952 (to T.) (S.H. 988. 22/2/21.) Bm. 5985:S. X3458 X224 [STAMPED: RECEIVED BY5-P10.10.21.] Mr Pendlebury from BY. c. Hs. 40/50 CHASSIS. REAR HUB AND BRAKE. RE THE TROUBLE WE ARE HAVING FROM… | ||
| Scan028 | Correspondence with supplier Ferodo Ltd. about a missing graph for a 40/50 HP chassis rear hub and brake. | ||
| View original record | Handwritten: By. from Wd. (struck through) c. to EP. c. to Hs. X 3458 X 3409 (struck through) X3458 Typed: Wd9/NJ13.10.21. 40/50 h.p.Chassis - Rear Hub & Brake. I send you (By) herewith a letter from… | ||
| Scan029 | Suggesting experimental tests to address issues with brake drum polishing and the consequent loss of braking effectiveness. | ||
| View original record | R.R. 63 (500 H) (S.E. 441. 22-1-18.) Bm. 2/212/18. X3458 Hs. from BY. BY5-P14.10.21. REAR HUB AND BRAKE. X3458 RE POLISHING OF BRAKE SHOES AND DRUMS AND X3409 CONSEQUENT FALLING OFF IN BRAKING… | ||
| Scan030 | Performance, materials, and friction coefficient of brake drums and Ferodo brake liners. | ||
| View original record | R.R. 65 (500 H) (S.E. 441. 22-1-18.) Bm. 2/212/18. Handwritten: X3458 OCT 17 Md. from BY. c. Hs. Handwritten: X3458 X3409 Stamp: RECEIVED BY4-P14.10.21. 40/50 CHASSIS. REAR HUB & BRAKE. RE BRAKE… | ||
| Scan031 | Continued letter discussing experimental work and requesting assistance from Messrs. Ferodo Ltd. | ||
| View original record | R.R. 4452 (to T.) (S.H. 988. 22/2/21.) Bm. 59858. 70 BY4-P14.10.21. contd. - 2 - We are endeavouring to locate this position ourselves, but put the facts before Messrs. Ferodo Ltd., at the request of… | ||
| Scan032 | Proposal to supply Ferodo Ltd. with a complete rear hub and brake assembly for testing brake liners. | ||
| View original record | X3458 COPY. Wd From BY. C. Hs. FC 1921 BY6-P1.11.21. X3458 X3409 40/50 CHASSIS. REAR HUB & BRAKE. RE BRAKE LINERS. Referring to Wd1/NJ281021 and Ferodo Ltd., letter of the 26th inst., after… | ||
| Scan033 | Request for the return of a loaned pamphlet concerning 4-wheel brakes. | ||
| View original record | X15559 R.R. 25m (M T) (S H. 928. 19-2-21) G. S. 69 PN. from Hs. nsl/LG4.11.21. 4-WHEEL BRAKES. We should be pleased to receive from you pamphlet of the 4-wheel braking which we loaned to you when you… | ||
| Scan034 | Brief note of thanks for a pamphlet on 4-wheel braking, which is being returned. | ||
| View original record | XG428/1557 PN4/DN/5.11.21. S/W. Hs. Very many thanks for the pamphlet on 4-wheel braking, which I now return to you. [Handwritten initials: P.N.] [Stamp: Purple Triangle] [Stamp: RECEIVED NOV 7]… | ||
| Scan035 | Cover note from Hs. to R. regarding an attached article on four-wheel braking. | ||
| View original record | X 15598 R.R. 235a (100 T. S.H. 788. 10-12-20) G. 2042 R. from Hs. Hsl/LG8.11.21. FOUR WHEEL BRAKING. Attached herewith is an article on four wheel braking which may be of interest to you. Hs. | ||
| Scan036 | Modification to the heat treatment process for 40/50 chassis brake drums. | ||
| View original record | X3458 EP. from BY. c. Hs. BY7-P25.8.22. 40/50 CHASSIS. BRAKE DRUMS. /3458 With reference to EP/Thn7/H3822, a month ago I altogether modified the heat treatment for the above parts by instructing the… | ||
| Scan037 | Material characteristics and friction coefficient of the Ferodo brake lining on the 40/50 chassis rear brakes. | ||
| View original record | X3458 40/50 CHASSIS. REAR BRAKES. Referring to Wd2/NJ7922 and the Ferodo Company's letter of the 5th ultimo., written as a result of my memo BY14-P31822, I regret pressure of work has prevented me… | ||
| Scan038 | Complaints of rattling brake ropes on the 40/50 chassis and a proposed temporary fix. | ||
| View original record | Y3458 BY [REDACTED] C. to Hs. EP8/H12.10.22. Y3422 Y3458 40/50 Chassis - Rattling of Brake Ropes. With reference to our complaints on this matter some months ago, the altered position of the brake… | ||
| Scan039 | Sending drawings concerning the front wheel brakes of Saurer lorries. | ||
| View original record | P/Hs. X4428.1559 Wa.6/Go.25.10.22 re Automobiles Industriels "SAURER" With further reference to our visit to Messrs SAURER's works, I am sending you herewith the following drawings: 3 AS 4948 3 AS… | ||
| Scan040 | Design and patent status of front wheel brakes used on Saurer Lorries. | ||
| View original record | To R. from Hs. c. to CJ. X4424 X559 Hs2/LG30.10.22. "SAURER" FRONT WHEEL BRAKES. We send herewith 3 arrangement drawings which give particulars of the front brakes used on the Saurer Lorries. The… | ||
| Scan041 | Investigation report into the cause of rear brake squeaks, including a diagram of the brake shoes. | ||
| View original record | 40/50 x3458 REAR BRAKE SQUEAKS. Foot brake. Squeaks appear to come from off-side brake. Brake dismantled and examined. Top shoe worn most - bottom shoe fair and even. 1/3 of top shoe worn very badly… | ||
| Scan042 | Foot brake issues, specifically squeaking and binding when brake shoes are reversed. | ||
| View original record | contd:- -2- foot brake. When shoes are reversed, a slight squeak appears on forward, and an occasional one on reverse. With shoes reversed, brakes bind very badly - Quite O.K. when replaced in… | ||
| Scan043 | Blueprint and notice for a front wheel brake produced by Messrs LEMOINE. | ||
| View original record | Hs 1559 XC4428 RECEIVED JUN 1 1923 P/W Hs. Wa.2/Co.30.5.23 Re: Invention ---------------- We are sending you herewith blue print and notice of a front wheel brake produced by Messrs LEMOINE. If it is… | ||
| Scan044 | Letter from Établissements Lemoine proposing their new HERBOT front-wheel braking system. | ||
| View original record | ÉTABLISSEMENTS LEMOINE Sté Ame Capital 6.000.000 Frs 21, RUE DE LAPPE PARIS USINES: 45, Bd Louis Lemoine, IVRY-PORT 61, Rue Lauriston (Champs Elysées) ADRESSE TÉLÉGRAPHIQUE MELNOIE PARIS TÉLÉPHONE RUE… | ||
| Scan045 | Promotional document in French for the Hersot front brake system by Établissements Lemoine. | ||
| View original record | 96 DESCRIPTION La timonerie actionne directement, au moyen du levier B, l'arbre flexible A d'une constitution toute spéciale. Celui-ci, pouvant tourner et coulisser librement dans le support K formant… | ||
| Scan046 | Promotional leaflet for the Lemoine-patented Hersot front brake system, detailing its characteristics and advantages. | ||
| View original record | FREIN AVANT HERSOT BREVETÉ S. G. D. G. LEMOINE LICENCIÉ EXCLUSIF POUR LA FRANCE ET LES COLONIES Le frein Hersot (LEMOINE, licencié France et Colonies), est une solution entièrement nouvelle et… | ||
| Scan047 | Tests to ascertain the effect of a 20 lb load on 40/50 Chassis Brake Springs G335 when heated to various temperatures. | ||
| View original record | By c.to Hs. H11/EF30823. Y3458 Laboratory. Re Tests to ascertain effect of a 20 lb.load on 40/50 Chassis Brake Springs G335, when heated to various temperatures. Method of Test. A bar of steel 1¼" X… | ||
| Scan048 | Fifth laboratory test report on 40/50 Chassis Brake Springs G335, detailing changes in length after heat treatment. | ||
| View original record | X3458 c.to Hs. H16 H16/EF31823. Laboratory. Re Tests on 40/50 Chassis Brake Springs G335, (further to our report H11/EF30823.) As requested we have carried out a fifth test on the above springs, and… | ||
| Scan049 | Cover note for a press extract concerning the Midland Automobile Club's Shelsley Walsh Hill Climb. | ||
| View original record | X1559 Wor. c. to Re. [Strikethrough] c. to BY [Strikethrough] c. to Hs. c. to EP. ROY2/MG11.9.23 The attached Press extract re the Midland Automobile Club Shelsley Walsh Hill Climb on Saturday may be… | ||
| Scan050 | Letter from automobile component manufacturer Alford & Alder regarding their patented Front Wheel Brakes. | ||
| View original record | X1559 FIRE: We do not accept any liability for any injury which may be caused by Fire to any Motor Car or Motor Cycle or part thereof entrusted to us for any purpose whatever. CUSTOMERS CARS ARE ONLY… | ||
| Scan051 | Continuation sheet of a letter from Alford & Alder regarding the trial of their brakes. | ||
| View original record | ALFORD & ALDER. Continuation Sheet No. 2 do not expect you to realise how effective the control is without an actual trial, under the worst conditions that you can possibly find with a car fitted with… | ||
| Scan052 | Attaching a copy of the description and blueprints for the U.S. Axle Company's front wheel brake design. | ||
| View original record | X1559 To [illegible] from BJ. c. to EP. c. to Hs. BJ/Py4/D27.11.23. Re: 4 Wheel Brakes - U.S. Axle Company. ------------------------------------ I attach hereto copy of Oyl-E-111623 of November the… | ||
| Scan053 | Letter forwarding a front wheel brake design from the U.S. Axle Company for inspection and comment. | ||
| View original record | Oy1-E-111625 November 16, 1925. Mr. Claude Johnson, Rolls-Royce, Ltd., London, England. (Copy for attention of Mr. Royce " " " Mr. E. Platford " " " Mr. E. Hives) COPY Dear Sir: We forward herewith… | ||
| Scan054 | Letter to the U.S. Axle Company acknowledging receipt of front wheel brake blueprints and forwarding them to the design department in England. | ||
| View original record | Gy2-E-111828 November 16, 1923. Mr. Kenneth Howard, U. S. Axle Company, Pottstown, Pa. Dear Sir: We have received description of your front wheel brakes with blueprints, and in accordance with our… | ||
| Scan055 | Copy of a document from The U.S. Axle Company detailing their front wheel brake data. | ||
| View original record | COPY. THE U. S. AXLE COMPANY. FRONT WHEEL BRAKE DATA. Briefly we will cover a few points regarding the action and design as follows:- Brake lever (A) is keyed to push rod (B), and can be located in… | ||
| Scan056 | Graph of torque input versus torque output, showing the friction effect for a W.W. slow speed servo. | ||
| View original record | CURVES SHOWING FRICTION EFFECT IN W.W. SLOW SPEED SERVO. AXIS LABELS: TORQUE OUTPUT. lbs. INS. TORQUE INPUT. lbs INS. PLOT LABELS: TOTAL TORQUE OUTPUT. INCREASING LOAD DECREASING LOAD SERVO TORQUE… | ||
| Scan057 | Excessive wear on brake drums for chassis 56-S-5 and the proposed repair procedures. | ||
| View original record | X3458 EP. BY16/H. 18. 6. 24. CHASSIS 56-S-5. EXCESSIVE WEAR ON BRAKE DRUMS. ------------------------------- We should not scrap Brake Drums immediately they begin to wear or show roughness. The brake… | ||
| Scan058 | Air Brakes and the forwarding of related documents. | ||
| View original record | To R. from BJ. c. to EP. c. to Hs. X1559 BJ/PyB/D7.7.24. Re: Air Brakes. I attach hereto copy of Cyl-E-62625, together with the booklets referred to. Will EP. and Hs. note that only one copy of the… | ||
| Scan059 | The inaccuracies of road tests published in motor papers due to speedometer errors. | ||
| View original record | R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rml/LG21. 3. 25. ROAD TESTS REPORTED IN - 'THE MOTOR' AND 'THE AUTO CAR'. Recently the motor papers have taken it upon… | ||
| Scan060 | Analysing the improbable performance claims of a 45 HP Renault competitor vehicle. | ||
| View original record | R.R. 493A (50B) (D.B. 175 25-9-24) J.H.D. -2- EXPERIMENTAL REPORT. Expl. No. REF Hs/Rm1/LG21.3.25. where they could ensure they were not being misled by the speedometer, and Brooklands has been closed… | ||
| Scan061 | Page discussing vehicle performance discrepancies and testing methods. | ||
| View original record | R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF Hs/Rml/LG21.3.25. (from the illustrations and Reg.No., is the same car as was used for 'The Motor' tests), is stated to… | ||
| Scan062 | Renault acceleration curves and horsepower calculations. | ||
| View original record | R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF Hs/Rm2/LG21.3.25. RENAULT ACCELERATION CURVES. When any car is being driven along the road en full throttle at anything… | ||
| Scan063 | Concave HP curves and the impossibility of constant acceleration in touring car engines. | ||
| View original record | R.R. 493A (50m) (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… | ||
| Scan064 | Analyzing braking test methodologies and their inherent inaccuracies. | ||
| View original record | R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/Eml/LG23.3.25. ANALYSIS OF BRAKING CURVES. As we have previously pointed out, the results of braking tests are of… | ||
| Scan065 | Brake efficiency and critiquing braking curves from 'The Motor' magazine. | ||
| View original record | R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: Hs/Bm1/LG23, 3.25. BRAKE EFFICIENCY DECN. FT/SEC2 ROAD SPEED M.P.H. Underneath the curve in 'The Motor' the following… | ||
| Scan066 | Page 4 of an experimental report critiquing the braking test methodology used by 'The Motor' magazine. | ||
| View original record | R.R. 493A (50m) (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… | ||
| Scan067 | Time-velocity curve graph for a 40/50 R.R. Open Touring car, comparing it 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. & 40/50. DATED 26/2/23.… | ||
| Scan068 | Blueprint graph showing braking curves for a 40/50 model car under various 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 WHEELS… | ||
| Scan069 | Three graphs comparing braking performance curves for a 14 HP Sports Delage, a 12-25 HP Vermorel, and an 11-24 Lagonda. | ||
| View original record | Graph A: A. The Motor 3/2/25 ROAD SPEED M.P.H. TIME TO REST SECS TIMES WHICH WOULD CORRESPOND WITH DISTANCES GIVEN 14 H.P. SPORTS DELAGE BRAKING CURVE ROAD - TARRED CONCRETE DRY Data points: 26 Ft, 42… | ||
| Scan070 | Stamped document from the Print Room in Derby. | ||
| View original record | ROLLS-ROYCE, LIMITED PRINT ROOM, 23 MAR. 25 DERBY | ||
| Scan071 | Comparative analysis of velocity curves for a Bentley Speed Model and a Vermorel 12-25, with commentary. | ||
| View original record | Graph 1: The MOTOR 3/3/25. ROAD SPEED M.P.H. TIME SECS. BENTLEY SPEED MODEL. THIS THE VELOCITY CURVE CONSISTS OF TWO STRAIGHT LINES JOINED TOGETHER BY A CURVE. THIS IS MOST IMPROBABLE. Graph 2: The… | ||
| Scan072 | Blank document page featuring a red ink stamp. | ||
| View original record | ROLL... P... 25 MAIL 1925 DERBY. | ||
| Scan073 | Graphical analysis of the acceleration curves for a 45 HP Renault. | ||
| View original record | ANALYSIS OF CURVES OF ACCELERATION OF 45 H.P. RENAULT, GIVEN IN THE MOTOR 3/3/25, BRAKE HORSE POWER, ENGINE R.P.M., FULL SIZE CURVES, 10 M.P.H, 20 M.P.H, 30 M.P.H, 40 M.P.H, 50 M.P.H, 60 M.P.H, 70… | ||
| Scan074 | Blank document sheet with a Print Room stamp. | ||
| View original record | ROLLS-ROYCE, LIMITED PRINT ROOM. 21 MAR. 25 DERBY | ||
| Scan075 | Graph charting the average coefficient of friction and temperature of Ferodo bonded asbestos lining over one hour. | ||
| View original record | AVERAGE CO-EFFICIENT OF FRICTION OF FERODO BONDED ASBESTOS LINING. SPEED & WORK CONSTANT WITH THE TEMPERATURE RISE FROM 70° TO 525° FAH. IN ONE HOUR. Left Y-Axis: VALUE OF μ. Right Y-Axis: DEGS. FAHR.… | ||
| Scan076 | Stamped page from the Print Room with a list of four handwritten numbers. | ||
| View original record | ROLLS-ROYCE LIMITED. PRINT ROOM 8 - MAY 1925 DERBY. x3458 x3409 x8420 x5940 | ||
| Scan077 | Proposed experimental design for brake covers to prevent mud and stone ingress. | ||
| View original record | 43458 To BY. From DA. c. to CJ. Hs. PATIALA. X.3458 X.8360 DA1/M21.7.25. With reference to BY9/H15.7.25., and Mr. Sidgreaves letter on the complaint from Patiala of the mud and fine stones getting… | ||
| Scan078 | Proposed simple cover design for the 40/50 HP rear brakes. | ||
| View original record | Y3458 To BY. from DA. c. to CJ. Hs. DA2/M22, 7.25. 40/50 HP. REAR BRAKES. X. 8360 X. 3458 Replying to your BY8/H15.7.25., as in the case of the 20 HP. chassis, Mr. Royce would like to try a simple… | ||
| Scan079 | Semi-hydraulic brake system, noting a similar design by the Sunbeam Co. and questioning the patentability of their own design. | ||
| View original record | R. c. Sg. c. Lor. o. Da. c. Hs. c. RY/AH. X155q BY.1/G.17.10.32. RECEIVED 17 OCT 1932 SEMI-HYDRAULIC BRAKE SYSTEM FOR MOTOR CARS. N.SCH. 3560. Referring to R.1/M.5.10.32. we have gone carefully into… | ||
| Scan080 | Potential substitution of Duralumin with hard rolled aluminium sheet for Brake Cover Plates to achieve a cost saving. | ||
| View original record | G.R.Y. Hs. RHO 81559. BY/EM/J.16.12.32. Brake Cover Plates G.78276/7. The Order Office have drawn our attention to the fact that if it is possible to use hard rolled aluminium sheet in place of… | ||
| Scan081 | Running aluminium brake carrier plates on cars in France. | ||
| View original record | X 1859 BY. from Hs/Gry. Hs/Gry.4/KT.15.2.33. BRAKE CARRIER PLATES. BY14/G10.2.33. We are running aluminium brake carrier plates on 19-EX, 3.Per.II, and Bensport, all these cars being in France. So far… | ||
| Scan082 | Test report on the extension of two Bensport front brake ropes under sustained load. | ||
| View original record | FILES. X 1559. 11.5.33. BRAKE ROPE EXTENSION. Two Bensport front brake ropes, each supporting a load of 200 lbs. were left undisturbed for a period of 148 hrs., the extension being measured every 24… | ||
| Scan083 | Analysis of an uncompensated braking system with mathematical formulas and test results. | ||
| View original record | -3- Hs/Grv.7/KT.25.9.33. For the uncompensated system shown, the amounts of braking can be shown to be front mαρ/(m²+αλ) and rear nβρ/(n²+βμ) and the sponge at the points F. and R. to be (m²+αλ)/α and… | ||
| Scan084 | Proposal to redesign the front brake equaliser mechanism for improved efficiency and lower cost. | ||
| View original record | 198 -4- Hs/Gry.7/KL.25.9.33. present swinging arm is a simple and effective equaliser. Although we think the front brake equaliser should be retained, we think a new design is required to provide a… | ||
| Scan085 | Requesting a valve modification to resolve an issue with brake thumps. | ||
| View original record | Xr559. 204 To RHC: from Hs/Gry: Hs/Gry.1/KT.13.10.33. BRAKE THUMPS: Will you please make a valve to the accompanying Hs.1166. We find that with a .015 hole in the piston as at present, thereis… | ||
| Scan086 | Blueprint of a valve for a front brake dashpot, including specifications for an internal spring. | ||
| View original record | Hs 1166 SPRING 10 TOTAL COILS 8 WORKING OF .020 WIRE & .0875 MEAN RADIUS FREE LENGTH .300 +5 .250 BAKELITE GB 857 MODS SCALE 2/1 ROLLS-ROYCE, LTD. PRINT ROOM 13 OCT 1933 DERBY. VALVE FOR FRONT BRAKE… | ||
| Scan087 | Blueprint of a Type 33 steering axle with 45 Hispano brakes. | ||
| View original record | ESSIEU DIRECTEUR DE 45 avec freins "Hispano" Type: 33 Frein de Jante. K.955 Patin de frein monté sur fusée de droite de Hoo. 1K598 par 3 rivets de 10% des Mantons. Cet oeil ne s'ajuste que sur la… | ||