Rolls-Royce Archives
| Identifier | Entry | ||
| img001 | Letter from F.H. Royce regarding the policy on body weights for the 20 HP and Goshawk chassis, with criticism of coachbuilding practices. | ||
| View original record | To CJ. from R. (At Le Canadel) c. to BY. Hs. EP. c. to E. Da. [Handwritten] 20HP BODY WEIGHT POLICY! [Typed] X.3730 X.4219 [Handwritten] R-RAMPANT [Typed] My dear CJ., Since writing to you yesterday,… | ||
| img002 | Urging a change in development priorities for aero engines and expressing frustration with the slow pace of progress. | ||
| View original record | POLICY R ORIGINAL R1/M26.8.25. X1906 F4369 X3804 X.4G44 X4550 FROM R. Copy to BY. HS. re. AERO ENGINES. We should realise that we are probably doing wrong by spending our time on - (1) Swash plate… | ||
| img003 | Standardisation sheet for a design alteration to flap-type bonnet ventilator shutter pivots. | ||
| View original record | To R. From Hs/Lid. Hs/Lid.6/MJ.14.7.31. ORIGINAL X.7260. X.1085. STANDARDISATION SHEET. FLAP TYPE BONNET VENTILATORS. We have moved the pivot of the shutters .250" nearer the centre than on the bonnet… | ||
| img004 | Specifications for a proposed harmonic damper, including its polar moment of inertia and natural frequency. | ||
| View original record | ORIGINAL To E. From Hs/Gry. Hs/Gry.1/MJ.21.8.31. r634. Herewith sketch of proposed harmonic damper. The polar moment of inertia is 13.8 lbs. in.2 or about one tenth of the effective interia of the… | ||
| img005 | Calculations for a harmonic damper. | ||
| View original record | To E. From Hs/Gry. Hs/Gry.3/MJ. 28.8.31. ORIGINAL HARMONIC DAMPER. Herewith calculations done at Cambridge on spring driven damper. The value of M is the effective polar moment of inertia of the… | ||
| img006 | Testing of balanced crankshafts and the production implications for the 25 HP and Phantom models. | ||
| View original record | To R. From Hs. c. to Sg. Wor. c. to By. ORIGINAL Hs.4/MJ.21.8.31. X.694. (crossed out) X.7010. X.5010. BALANCE WEIGHTS. R.4/M17.8.31. We had received instructions from W.W. to try a completely… | ||
| img007 | Examination and road test of a 27 HP Buick 8-cylinder engine. | ||
| View original record | To R. from Hs/Gry. c. Sg. c. Wor. E. c. Da. PY. ORIGINAL Hs/Gry.1/AD4.9.31. 27 HP. BUICK 8-CYLINDER. X3317. We have recently had an opportunity of trying one of these cars which had done 11,000 miles… | ||
| img008 | Testing Chrysler balance weights on a 25 HP engine to eliminate flywheel vibration. | ||
| View original record | To R. from.Hs/Cry c. Sg. c. Wor...E. C. Ds. PV. Hs/Cry.1/AD21.9.31. X.634. X.5810. BALANCE WEIGHTS 25 HP. We can now report on a test of Chrysler balance weights to LeC.2936 on a car which, without… | ||
| img009 | Bench tests for improved performance of the 25 HP engine. | ||
| View original record | SPEED FILE 12-GIV ORIGINAL To R. from Hs/ c. Sg. c. Wor. E. c. Da. EV. Hs/Rm3/AD1.5.8.31. X5771 / 85770. IMPROVED PERFORMANCE 25 H.P. We carried out some bench tests to see how much we could increase… | ||
| img010 | Vehicle performance testing, detailing modifications to the propeller shaft and exhaust, and analysing lap speeds. | ||
| View original record | Rm3/ADM.5.8.31. contd. -2- A 3" dia. propeller shaft was fitted to prevent whirling - we already have a design of cross member which enables us to utilise this. The P.II. exhaust system was fitted… | ||
| img011 | Blueprint graph of engine performance tests from Brooklands showing BHP and MEP against RPM. | ||
| View original record | 12 GIV BROOKLANDS TESTS AUG. 1931 R.M.27 CHINA UNIT 112° SHAFT CO OPEN HIGH LIFT ROCKERS S .65 C/R 14-50 AXLE RATIO S.U. H.V. 5. CARB. STD 15% LARGER B.H.P. M.E.P. INDUCTION DEPN. INS. HG. NO HOT SPOT… | ||
| img012 | Performance comparison graph of different exhaust systems against engine RPM. | ||
| View original record | RM.26 COMPARISON OF EXHAUST SYSTEMS. CHINA 112 SHAFT HIGH LIFT ROCKERS 5.65 C/R STD 15% LARGER CARB. ① OPEN EX. ② PII EX. SYSTEM ③ W.W. NSCH3286 PII FISHTAIL ④ W.W. NSCH 3286 25H.P. FISHTAIL ⑤ STD 25… | ||
| img013 | Performance data from a Brooklands test comparing different car configurations and components. | ||
| View original record | RM. 28 12 G IV BROOKLANDS TEST 14/8/31 CLOSE COUPLED FOUR SEATER WT. 32.25 CWT AXLE RATIO 11x50 TYRES 6" FORT DUNLOPS 19 RIMS. 60 M.P.H. = 3000 R.P.M. CONDITION OF CAR AND UNIT | Lap Time | Lap Speed… | ||
| img014 | Technical memorandum discussing proposals for increasing the performance of the 25 HP car. | ||
| View original record | SPEED' FILE ORIGINAL To R. from Hs. c. Sg. c. Wor. K. c. Dn. RV. HsL/AM5.8.31. INCREASED PERFORMANCE OF 25 H.P. x.5771. X.5010. If we can offer a 25 HP. car which has a maximum top speed of 75 M.P.H.… | ||
| img015 | Treatment of rivetless bonnets and concealed hinges, comparing manufacturing methods with other car makers. | ||
| View original record | ORIGINAL To Ey. From Hs/Lid. c. to Sg. E. c. to Ey. Hs/Lid.5/KT.22.6.31. 8385. RIVETLESS BONNETS. With reference to EV2/18.6.31. we attach sketched of the treatment of rivetless bonnet hinges as used… | ||
| img016 | Schemes to overcome rear brake groans and squeaks. | ||
| View original record | To R. From Hs. c. to Sg. For. c. to E. Da. c. to By. EP. ORIGINAL: Hs.11/MJ.9.6.31. x7360. P.2 REAR BRAKE GROANS & SQUEAKS. Referring to our memo Hs/GWH.1/AD.29.5.31. where we suggest that by… | ||
| img017 | Brooklands test results comparing acceleration and maximum speed for three different car configurations. | ||
| View original record | ORIGINAL To R. From Hs. c. to SG. Wor. c. to E. Rn. c. to Ey. PH. Hs/Rm.1/KT. 23.6.31. 8788. 8577'. BROOKLANDS TESTS. 19.6.31. Tests were conducted on three cars to estimate the acceleration and… | ||
| img018 | Performance comparison report of various car configurations, focusing on speed and acceleration. | ||
| View original record | - 2 - The most interesting point is that with the C.O. open 16.G.IV. is only 1 M.P.H. slower than 18.G.IV. whereas with the C.O. closed this difference is increased to 3.9 M.P.H. - i.e. we can get an… | ||
| img019 | Performance comparison and analysis of a closed 8-cylinder Buick, noting its engine, weight, and handling characteristics. | ||
| View original record | Hs/Rm.1/KT.23.6.31.cont'd. - 3 - with its improved power, as smooth and silent as the standard car. BUICK. We had a closed 8 cyl. Buick with a displacement of 3620 c.c. for comparison. The weight of… | ||
| img020 | Graph from Brooklands tests comparing horsepower, RPM, and road speed for different engine configurations. | ||
| View original record | Hs. 400 SHEET II BROOKLANDS TESTS 19/6/31 C.O. CLOSED 18 GIV 68.7 M.P.H. G.S.R.14 63.2 M.P.H. 18 GIV 35.7 CWTS JAPAN UNIT C/R 5.25 PIT SILENCER TWIN ZENITH 26 M.M. CHOKES. 112° CAMSHAFT C.O. CLOSED.… | ||
| img021 | Performance graph from Brooklands tests comparing Clutch HP and B.M.E.P. for two different vehicle configurations. | ||
| View original record | H.S. 401 H.S.401 BROOKLANDS TESTS 19/6/31 LAP SPEED C.O. CLOSED 18GW 68.7 M.P.H. G.S.R.14 63 M.P.H. -- (Dashed line curve details) -- 18GW 35.7 CWTS JAPAN UNIT TWIN ZENITHS 26 M/M CHOKES 112° CAMSHAFT… | ||
| img022 | Graph plotting Brake Horsepower and Brake Mean Effective Pressure against engine RPM from Brooklands tests. | ||
| View original record | SHEET I HS402 BROOKLANDS TESTS 19/6/31 LAP SPEED C.O. OPEN. 18G IV 70.64 M.P.H. 16G IV 69.66 18G IV 35.7 CWTS. JAPAN UNIT C/R. 5.25 TWIN ZENITH 26MM CHOKES 112° CAMSHAFT OPEN EXHAUST T.O.C. 11 49 49… | ||
| img023 | Tests on R. engine timing and camshafts, including diagrams comparing different timing settings. | ||
| View original record | The 20/25 benefits from 'R' engine inlet cams To E. From Hs/Rm. c. to By. Hs/Rm.6/KT. 24.6.31. X7090. TIMING AND CAMSHAFTS. We have made some more tests with the 1140 R. engine cam form camshaft.… | ||
| img024 | Camshaft alterations and their effects on engine performance, including M.E.P. and valve timing. | ||
| View original record | - 2 - The only alteration we would suggest is that having proved we can gain in low speed M.E.P. by altering the point of the exhaust valve opening to 40º B.B.C. we ought to try a shaft having this… | ||
| img025 | Experiments on carburetter positioning to determine the best all-round arrangement for a car engine. | ||
| View original record | To R. From Ha/Rm. c. to Sg. Wor. c. to Da. E. c. to By. ORIGINAL Hs/Rm.6/MJ.11.7.31. Y 080 x5080 We have been conducting various experiments on the positioning of carburetters with a view to… | ||
| img026 | Analysis of different carburetter arrangements and types, including Claudel and Zenith models. | ||
| View original record | -2- Hs/Rm.6/MJ.11.7.31.Cont'd. Arrangement (4) - Does not seem to have any particular merit as it eliminates ramming completely and whilst producing no more top HP. gives a very poor low speed M.E.P.… | ||
| img027 | Continued report on the characteristics and performance of S.U. carburettors. | ||
| View original record | -3- Hs/Rm.6/ML.11.7.31.Cont'd. S.U.CARBURETTERS. The S.U's. in spite of being a fixed jet carburetter, seem to break up the fuel stream very well. This of course is a feature of the expanding… | ||
| img028 | Performance graph comparing various carburetor arrangements for a PII engine with an aluminum head. | ||
| View original record | SHEET II Hs 411 COMPARISON OF VARIOUS CARB. ARRANGEMENTS P II 4.9 C/R ALUM HEAD ① TWO S.U'S PIPE ABOVE ② AS ① BUT PIPES JOINED TOGETHER CENTRALLY WITH THROUGH BORE ③ TWIN RR CARB 1.4 DIA. CHOKES ④… | ||
| img029 | Performance chart comparing different carburettor arrangements for a 25 HP engine. | ||
| View original record | SHEET 1 COMPARISON OF CARBURETTER ARRANGEMENTS FOR 25 HP HS. 413. JAPAN UNIT IV. G.8. 5.45 C/R. OPEN EXHAUST Nº1 TWO CLAUDELS. MM. CHOKES. 16mm INDUCTION AS SHOWN NºII TWO 36. VI. ZENITH. CHOKES 25m/m… | ||
| img030 | Alternative designs and materials, particularly aluminium versus steel, for rivetless bonnets. | ||
| View original record | To R. from Hs/Lid. c. Sg. Wor. c. E. Da. c. EV. ORIGINAL Hs/Lid./AD.15.7.31. RE : RIVETLESS BONNETS. X.7260. X.1085. We have now several alternative designs to work on, and it appears necessary to… | ||
| img031 | Summary of quarterly complaints and investigations into various brake-related issues. | ||
| View original record | To R. From GWH. c. to Sg. Wor. c. to E. Da. c. to By. EP. FILING RH. QUARTERLY COMPLAINTS. 84117 Item No.1. BRAKES. Front brake squeaks. We have tried experimentally every well known brake lining and… | ||
| img032 | Report page detailing issues and modifications for shock absorbers, springing, fabric couplings, steering, and exhaust systems. | ||
| View original record | (2) Item No.2. SHOCK ABSORBERS. Although a lot of work has been done on shock absorbers to eliminate the troubles, we are not in position to say at present, they are trouble proof. With the latest… | ||
| img033 | Modifications and resolutions for recurring vehicle complaints. | ||
| View original record | (3) Exhaust blows of the downpipe on the 20/25 HP. are being dealt with by a reinforced flange. We have not received a recurrent complaint after this modification has been carried out. Item No.6.… | ||
| img034 | List of resolved issues and ongoing improvements for various vehicle components. | ||
| View original record | (4) Item No.12. REAR AXLE THRUST. This job has been thoroughly dealt with. The 20/25 HP. rear axle is now practically free from troubles. Item 13. TELEGAUGE. With the fitting of the fused glass joint,… | ||
| img035 | Report page detailing resolutions for a list of numbered customer complaints and component failures. | ||
| View original record | (5) this complaint. Item No.19. NOISY OIL PUMPS. Depots can cure this complaint by the fitting of the reservoir per H.206. The Works are also producing better gears on future cars, and are fitting the… | ||
| img036 | List of reported complaints and their corresponding resolutions for items 26 through 32. | ||
| View original record | (6) complaints have been reduced. Attention has been paid to the valve guides to lessen the tendency to stick. The fitting of the asbestos packing will also lessen this trouble. Item No. 26. RADIATOR… | ||
| img037 | Tests for a water pump fabric drive and a fix for engine water leaks from cylinders. | ||
| View original record | (7) Item No.33. WATER PUMP FABRIC DRIVE. We have tried out a guard for the drive which is satisfactory, and can be fitted for recurrent complaints. A new type of fabric drive is undergoing tests. Item… | ||
| img038 | Proposed wind tunnel experiments to reduce the windage of streamlined car bodies. | ||
| View original record | SPEED FILE ORIGINAL To R. from Hs/Rm. c. Sg. c. Hcr. Da. c. E. Ry. Hs/Rm2/A114.8.31. 87830. 85830. STREAM LINED BODIES - R.R. CARS. Recently, conditions of motoring have so altered that we believe it… | ||
| img039 | Alternative car body shapes for aerodynamic testing and referencing recent American studies. | ||
| View original record | Hs/Hm2/AM4.8.31 contd. -2- We suggest that if Ev. would sketch two or three alternative shapes of windscreen and rear end of the car, the manufacture of which he would consider feasible from the point… | ||
| img040 | Investigation into three recorded failures of the low inertia damper spring plate. | ||
| View original record | To E. from Hs/Lid. c. Ry. c. Wor. Mx. Hs/Lid/AD24.8.31. X.634. X.5010. LOW INERTIA DAMPER - SPRING PLATE FAILURES. Rv6/Gll.8.31. The total number of failures to date appears to be three. (1) On… | ||
| img041 | Summary of a 1926 analysis comparing the fatty oil composition of Price's and Wakefield's lubricating oils. | ||
| View original record | To R. From Hs. c. to Sg. Wor. c. to E. Da. c. to By. COPY. Hs.8/MJ.24.8.31. X.967. X.1583. LUBRICATING OILS. In 1926 we arranged for the L.M.S. Chemists at Derby to do a complete analysis of Price's… | ||
| img042 | The chemical analysis of two oil samples, 'A' and 'B'. | ||
| View original record | C O P Y. London Midland & Scottish Rly.Co., Chief Mechanical Engineers Dept., Chemist's Office, Calvert Street, Derby. 22nd. Feb.1926. REPORT ON 2 SAMPLES OF OIL. MESSRS. ROLLS-ROYCE, DERBY. The two… | ||
| img043 | Report comparing the viscosity and asphaltic bodies of two oil samples, 'A' and 'B', after a heat test. | ||
| View original record | -2- contd.... 200°C. for 24 hours. in order to ascertain the amount of alteration in the viscosity of the oil and the separation of asphaltic bodies insoluble in very light petroleum (Pentane). There… | ||
| img044 | Design rationale, conclusions from testing, and future plans for the auto friction damper on the 40/50 model. | ||
| View original record | To E. From Hs. Hs.12/MJ.24.8.31. 1634: AUTO FRICTION DAMPER. ON THE 40/50. You will remember at the time when this was designed the demand for it chiefly came about because of the "bus knocks" which… | ||
| img045 | Complaints of cracked exhaust manifolds on Phantom I & 20 HP models, proposing to test modified replacements on customer cars. | ||
| View original record | COPY. Hm. From Hs/Lid. Hs/Lid.9/MJ.22.7.31. QUARTERLY COMPLAINTS. CRACKED EXHAUST MANIFOLDS P.1 & 20 HP. We have several modified types of exhaust manifolds suitable for 20 HP. cars and cast iron head… | ||
| img046 | Quarterly complaints of cracked exhaust manifolds on Phantom I & P.2 models. | ||
| View original record | COPY. To Hs. (Derby) SEVRES. Hm/VAY/MLG.28.7.31. QUARTERLY COMPLAINTS. CRACKED EXHAUST MANIFOLDS P.1 & P.2. With reference to your memo Hs/Lid.9/MJ.22.7.31 we think that you will be quites safe in… | ||
| img047 | The dispatch of various experimental exhaust manifolds for Phantom I and 20 HP models for testing. | ||
| View original record | COPY. To Hm. From Hs/Lid. Hs/Lid.l/AD4.9.31. P.1 and 20 HP. EXHAUST MANIFOLDS. We are sending to you under separate cover the following experimental exhaust manifolds :- 1 set of 20 HP. manifolds to… | ||
| img048 | Request for information and monthly reports on the performance of experimental modified exhaust manifolds for P.1. and 20 HP cars. | ||
| View original record | COPY. To Hm. From Hs/Lid. c. to Sg. Ha/Lid.1/MJ.2.10.31. EXPERIMENTAL MODIFIED EXHAUST MANIFOLDS. We are particularly anxious to obtain some information on the behaviour of the modified exhaust… | ||
| img049 | Power output difference between balanced and unbalanced twin carburettors. | ||
| View original record | To R. from Hs/Rm. C. SE. Wor. C. Ds. E. Ev. Hs/Rm.2/AM.2.10.31. X7080. X7090. ORIGINAL BALANCED TWIN CARBURETTERS. We send you herewith curve Rm.P30 showing the difference in power output of the twin… | ||
| img050 | Graph comparing the power output of balanced and unbalanced twin carburettor configurations. | ||
| View original record | COMPARISON OF POWER OUTPUT BALANCED & UNBALANCED TWIN CARBS. STANDARD CAMSHAFT. VALVE LIFT .480 STANDARD HEAD. 4.78 C.R. TWIN CARBS 1.4 CHOKES RM. P.30 B.H.P B.M.E.P R.P.M. Valve Timing Diagram: EX SI… | ||
| img051 | Power output difference between balanced and unbalanced twin carburetters. | ||
| View original record | To R. from Hs/Rm. c. SE. Wer. c. Ds. E. Ev. ORIGINAL Hs/Rm.2/ADL2.10.31. x7080. x7090. BALANCED TWIN CARBURETTERS. We send you herewith curve Rm.P30 showing the difference in power output of the twin… | ||
| img052 | Bringing the battery ignition system up to date with an attached list of recommendations. | ||
| View original record | ORIGINAL To R. From Hs/Wst. c. to Sg. Wor. c. to E. Da. c. to By. Hs/Wst./MJ.14.10.31. X6095 X6096 BATTERY IGNITION. We understand that the question of bringing our battery ignition up to date will… | ||
| img053 | List of advantages for an outside primary coil, a reduced capacity condenser, and a lighter contact breaker lever. | ||
| View original record | 15.10.31. Outside primary coil. The advantages of this are :- (a) More efficient interlinkage due to windings being closer to the core. (b) Better magnetic circuit resulting in increased inductance… | ||
| img054 | List of potential improvements for ignition system components. | ||
| View original record | -2- Distributor with brass inserts and nickel rotor also longer distance to earth. (a) Combination of sparking points used on other makes and noticed to give better results than stainless steel. (b)… | ||
| img055 | The Delco-Remy vacuum-operated automatic ignition advance system. | ||
| View original record | To R. from Hs/Wst. c. Sg. c. Wor. E. c. Hs. RV. ORIGINAL Hs/Wst.4/AHS.15.10.31. X4354 X7685 DELCO-REMY VACUUM OPERATED AUTOMATIC ADVANCE. The Delco-Remy Co. have produced a new system of effecting… | ||
| img056 | Road test report on 1931 cars, specifically the Chrysler 6 Cylinder and the Morris Isis. | ||
| View original record | To R. From Hs/Rn. c. to Sg. Wor. c. to Da. H. c. to By. ---------------- ORIGINAL X4012 & X3531 ROAD TESTS, 1931 CARS. ----------------------- CHRYSLER 6 Cyl. 73 X 111 mm. 2734 cc.… | ||
| img057 | Performance comparison and critique of a 20 HP Wizard car against a standard 25 HP model. | ||
| View original record | -2- of the numerous crankshaft periods which are all present as there is no crankshaft damper. The shaft is held in four bearings. The valve gear is not quiet, it is an overhead camshaft. The… | ||
| img058 | Vehicle accessories including dash boards, double batteries for starting, and various headlamp technologies and controls. | ||
| View original record | (2) Ha/Wst.1/KT.30.10.31.contd. boards, a particularly pleasing one being the board on the big Renault. Electric petrol gauges and combined oil and temperature gauges were also featured on some… | ||
| img059 | Trends in automotive electrical equipment observed at the Olympia Motor Show, covering ignition systems, dynamos, and horns. | ||
| View original record | To R. From Hs/Wst. ORIGINAL. c. to Sg. Wor. c. to E. Da. c. to Hy. Hs/Wst.1/KT.30.10.31. X3374 ELECTRICAL EQUIPMENT AT OLYMPIA. Ignition. The Lorraine engine had its battery ignition distributor… | ||
| img060 | Automotive features including instrument boards, batteries, headlamps, and other accessories. | ||
| View original record | Hs/Wst./CL.30.10.31.contd. (2) boards, a particularly pleasing one being the board on the big Renault. Electric petrol gauges and combined oil and temperature gauges were also featured on some stands.… | ||
| img061 | Interesting features, specifically the engine mounting on a Chrysler Plymouth, from the 1931 Motor Show. | ||
| View original record | ORIGINAL To R. from Hs/Ltd. c. to Eg. Wor. c. to E. Da. c. to Hy. MOTOR SHOW 1931. There are several features exhibited at the motor show which are interesting in so much as they apply to points in… | ||
| img062 | Gearbox and steering technologies, including synchromesh and flexible shackles, with competitor analysis. | ||
| View original record | -2- Gearboxes. With reference to the gearbox problem, one is immediately struck by the number of cars exhibited in which some form of improvement has been made. This impression is further manifest by… | ||
| img063 | Report comparing competitors' flexible shackles, cooling systems, radiator designs, and frame construction. | ||
| View original record | -3- and Studebaker are at the front end. The following employ a flexible shackle at the rear end of the road spring similar in construction to the R.R. shackle:- Packard 8 cyl. 34.5 HP. Packard 8 cyl.… | ||
| img064 | Frame design, radiator mounting, and a detailed analysis of brake drum construction and materials. | ||
| View original record | -4- circularised scheme of spring controlled weights at the extreme ends of the front bumpers. The new big Hispano Suiza in spite of having three point rubber engine mounting by which frame stiffness… | ||
| img065 | Brake drum material composition, alternative suppliers, and the increasing use of hydraulic brakes and shock dampers. | ||
| View original record | -5- Hs/Lid.2/KT.31.10.31.contd. Silicon 2.00% to 2.20% Phosphorous .15% to .19% Manganese .75% to 1.00% Sulphur .09% Chromium .25% to .45% Brinnel:- Normal 300-220. Special duty 230-260. Tensile… | ||
| img066 | Page discussing ignition and induction systems, including a diagram of an induction pipe layout. | ||
| View original record | -6- HS/Lid.24/KT.31.10.31.contd. shock dampers are so connected up as to allow about .250" wheel movement before the damping comes into action. Ignition. Two points worthy of note were noticed on… | ||
| img067 | Brief run and test report on a Hillman Wizard '75' car. | ||
| View original record | Hm/Lad.2/RT.31.10.31.contd. THE HILLMAN WIZARD '75'. In connection with the Motor Show report we give particulars of a brief run on a Hillman Wizard '75' which we have been able to test out. Car… | ||
| img068 | Road test report comparing the performance of a Wizard 75 with a 25HP model on various test hills. | ||
| View original record | -3- portion of pedal movement engages the clutch and consequently care has to be exercised in using it. The steering is the best feature of the car and is remarkably good. It is exceptionally light,… | ||
| img069 | Performance comparison between the 20/25 HP car and the Hillman Wizard, considering the impact of chassis and body weights. | ||
| View original record | Hs/Lid.2/KCT.31.10.31.contd. -9- N.B. It is important to note that the performance given for the average 20/25 HP. is for a chassis loaded up to only 31 cwt; whereas the finished car of the partition… | ||
| img070 | Copied letter from Cadillac Motor Car Company detailing information on propeller shaft assemblies. | ||
| View original record | C.O.P.Y. CADILLAC MOTOR CAR COMPANY, DETROIT, MICHIGAN October 21, 1931. Mr. E.W.Hives, Rolls Royce Ltd., Derby, England. Dear Sir: Sub: Propeller Shaft. Replying to Hs/Gry/2/MJ I attach copy of note… | ||
| img071 | Shaft balance specifications and tube thickness recommendations for the Phantom II shaft. | ||
| View original record | -2- (5) Oakland cars run through within 3/4 oz. inch for balance and have to run smoothly up to 4000 r.p.m. (6) I did not know the thickness of the P.II shaft, but it scaled 1/8". You will note they… | ||
| img072 | Blueprint diagram of a Plymouth engine front and rear mounting system. | ||
| View original record | PLYMOUTH ENGINE FRONT MOUNTING THIS PORTION IS FIXED TO THE CHASSIS C CENTRE OF GRAVITY B CENTER OF GRAVITY STABILIZING SPRING PLYMOUTH ENGINE REAR MOUNTING | ||
| img073 | Diagrams of flexible shackle designs used on various car makes. | ||
| View original record | Top-Left Panel: FLEXIBLE SHACKLE ON 8 CYL STUTZ (DESCRIBED AS PATENT SHIMMY SHACKLE) REAR END OF FRONT SPRING. Top-Right Panel: SLOTTED PLATE REGULATING AMOUNT OF TRAVEL. SPRING GUIDE BOLT PASSING… | ||
| img074 | Suggested scheme of windings for an outside primary ignition coil design. | ||
| View original record | SUGGESTED SCHEME OF WINDINGS FOR R.R. DESIGN OF OUTSIDE PRIMARY IGNITION COIL. Primary. 400 turns of 23 S.W.G. S.C.C. enamelled wire Length of mean turn 6.00" Approx. resistance cold 3.60 ohms. Watts… | ||
| img075 | Letter from Mechanics Universal Joint Company discussing a formula for critical speeds of drive shaft tubes. | ||
| View original record | C.O.P.Y. MECHANICS UNIVERSAL JOINT COMPANY. Division of Borg-Warner Corporation ROCKFORD, ILLINOIS October 19, 1931. C.A.H. Engineering Company, 5-139-140 General Motors Bldg. Detroit, Michigan.… | ||
| img076 | Performance and measurement of friction torsional vibration dampers. | ||
| View original record | To R. from Hs/Gry. c. to Sg. Wor. c. to E. Da. c. to Ry. ORIGINAL Hs/Gry.4/KT.7.11.31. x634. FRICTION TORSIONAL VIBRATION DAMPERS. According to Carter's calculations this type of damper lowers the… | ||
| img077 | Viability of purchasing and modifying a small Fiat car for the Peregrine class. | ||
| View original record | To R. From Hs. c. to Sg. Wor. c. to E. .Da. c. to By. SMALL CAR REPRESENTATIVE OF PEREGRINE. It was agreed some time ago that we should look around to see whether we could recommend the purchase of a… | ||
| img078 | Review of a 2.5 Litre Fiat Saloon, covering its specifications, performance, and handling characteristics. | ||
| View original record | Hs/Rm.1/MJ.13.11.31. 2.5 LITRE FIAT SALOON. TAX £20. The main particulars of this car are :- 6 cyl. Mono-block casting. Seven bearing crankshaft. 19.3 H.P. 72 x 103 mm. 251 cc. Wheel base 9 ft. 1 1/2… | ||
| img079 | Road test report and comparison of a car against competitors like the Wizard, Fiat, and Chrysler. | ||
| View original record | -2- Hs/Rm.1/MJ.13.11.31.Cont'd. top gear. Its acceleration is not outstanding but it cannot be called sluggish. The ingle Solex fitted is free from flat spots and pleasantly responsive. The body… | ||
| img080 | Design and limitations of the Diamond engine mounting system. | ||
| View original record | To R. From Hs. c. to Sg. Wor. c. to E. Da. c. to By. ORIGINAL Hs.8/MJ.16.11.31. X.7005. X.5085. DIAMOND ENGINE MOUNTING. The design of Diamond engine mounting so far has been on the basis of a… | ||
| img081 | Test results on the average rate of oil displacement in self-adjustable hydraulic shock absorbers. | ||
| View original record | ORIGINAL To R. from Hs/Rm. c. Sg. c. Wor. E. c. Ds. EV. X.235 X.7920. X.5520. Hs/Rm.2/AM9.11.31. SELF ADJUSTABLE HYDRAULIC SHOCK ABSORBERS. In view of your suggestion that it might be possible to make… | ||
| img082 | The movement of shock damper levers, comparing pumping action at various speeds. | ||
| View original record | To R. from Hs/ c. Sg. c. MOT. E. c. Dr. RV. MOVEMENT OF SHOCK DAMPER LEVERS P.II. In order to compare the pumping action available at the shock dampers at various speeds, the following figures have… | ||
| img083 | Test data for various rear damper specifications at different speeds on two road surfaces. | ||
| View original record | Time in secs. to complete 360° of the O.S. rear damper in an upward direction Specification of rear dampers. Speed in MPH. ROAD SURFACE "A" ROAD SURFACE "B" Outward direction Inward direction Outward… | ||
| img084 | Comparing clutch spring loads, leverages and pedal pressures between the 25 HP and 40/50 HP models. | ||
| View original record | To Da. From Hs/Rm. ORIGINAL Hs/Rm.1/AD21.11.31. x5480. With reference to your enquiry re the clutch spring loads and leverages Da2/M7.11.31, we attach a sketch showing the existing leverages. We have… | ||
| img085 | Fitting a Bosch dynamo and comparing the third brush machine with a voltage control generator. | ||
| View original record | ORIGINAL. To R. From Hs. c. to Sg. Wor. c. to E. Da. c. to By. Hs.1/MS.23.11.31. X4562 BOSCH DYNAMO. With reference to the attached, we are arranging to fit this dynamo on to one of our chassis. We… | ||
| img086 | Tests on cross steering tube load variations and a potential solution involving component clearances. | ||
| View original record | To Da. from Hs/Rm. Hs/Rm.1/AD25.11.31. X.7425. X.5425. You will remember that you wrote asking us whether the variation in cross steering tube load was due to the spring taking a permanent set, or… | ||
| img087 | Comparative test report between a 29 HP 8 Cylinder Chrysler and a Rolls Royce 16-G.4. | ||
| View original record | ORIGINAL To. R. from Rm. c. Sg. Wor. cc. Da. E. By. Hs/Rm.1/ME.9.2.31. X4012. 29 H.P. - 8 CYLINDER CHRYSLER. We had the opportunity of carrying out a careful comparative test between one of these cars… | ||
| img088 | Page 2 of a vehicle performance report, detailing analysis of the gearbox, suspension, steering, and brakes. | ||
| View original record | - 2 - Gear Box. This has an almost inaudible third. The change is remarkably simple in spite of the fact that it is a straight dog. We attribute some of the easy change to the light fly wheel and the… | ||
| img089 | Trial and potential purchase of a Maybach car, focusing on issues with its clutches. | ||
| View original record | To R. From Hs. c. to Sg. WoT. c. to E. Ds. c. to Ry. ORIGINAL γ MAYBACH CAR. Rn. has gone to Berlin. The Motor Show is at present being held there and he will try the different types of Maybach cars… | ||
| img090 | Supercharged Mercedes and Lockheed brakes from the 1931 Berlin Motor Show. | ||
| View original record | To R. From Hs/Rm. c. to Sg. NOR. c. to E. Da. By. Hs/Rm.2/RT.9.3.31. x651. x407. BERLIN MOTOR SHOW, 1931. 8 CYL. SUPERCHARGED MERCEDES. We tried the 7655 C.M. Mercedes which has a bore and stroke of… | ||
| img091 | Technical report discussing designs for bonnet ventilators and shock dampers. | ||
| View original record | - 2 - with their fitting and also the consequent central lubrication points. The one point where they are unsatisfactory is that too much pedal pressure is required on big cars. If this system was… | ||
| img092 | Carburettor silencers and interior heating systems, with a diagram for the latter. | ||
| View original record | - 3 - Hs/Rm.R/K.T.9.3.31.cont. in front of the front axle. Chryslers, Packard, and in fact most cars are using this. The main advantage as far as we can see is accessibility because there does not… | ||