Rolls-Royce Archives
| Identifier | Entry | ||
| img001 | Letter concerning the 20 HP chassis body weight policy and criticizing archaic bodybuilder practices. | ||
| View original record | [Handwritten] 20 HP BODY WEIGHT POLICY! 10 To CJ. from R.(At Le Canadel) c. to HY. Hs. EP. c. to E. Da. My dear CJ., Since writing to you yesterday, I think I have come across the reason for our… | ||
| img002 | Prioritization of aero engine design and production projects. | ||
| View original record | FROM R. Copy to HS. re. AERO ENGINES. Handwritten notes: POLICY, R, R1/M26.8.25, X1906, X4369, X3804, X.4544, X4550 We should realise that we are probably doing wrong by spending our time on - (1)… | ||
| img003 | Standardisation sheet about moving the pivot on flip flap type bonnet ventilators. | ||
| View original record | ORIGINAL To R. From Hs/Lid. Hs/Lid.6/MJ.14.7.31. X.7260. X.1085. STANDARDISATION SHEET. FLIP FLAP TYPE BONNET VENTILATORS. We have moved the pivot of the shutters .250" nearer the centre than on the… | ||
| img004 | The 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 spring-driven 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 | Tests on balanced crankshafts, production schedules, and stock levels for various car models. | ||
| View original record | To R. From Hs. c. to Sg. Wor. c. to By. Hs.4/MJ.21.8.31. X.7010. X.5015. BALANCE WEIGHTS. R.4/107.8.31. We had received instructions from W.W. to try a completely balanced crankshaft including the big… | ||
| img007 | Examination and on-road performance review of a 27 HP Buick 8-cylinder engine. | ||
| View original record | ORIGINAL To R. from Hs/Gry. c. Sg. c. WOr. E. c. Pl. Ev. Hs/Gry.1/AD4.9.31. 27 HP. BUICK 8-CYLINDER. Y3317, We have recently had an opportunity of trying one of these cars which had done 11,000 miles… | ||
| img008 | Testing Chrysler and Rolls-Royce balance weight schemes to eliminate flywheel vibration on a 25 HP engine. | ||
| View original record | To R. from.Hs/Gry c. Sg. c. Wor..H. c. De. RV. Hs/Cry.1/ADSL.9.31. x.634 x.5910. 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 and modifications for improved performance on a 25 HP engine. | ||
| View original record | SPEED FILE 12 GIV ORIGINAL To R. from Hs/Rm. c. Sg. c. Wor. c. E. c. Da. EV. Hs/Rm3/AD.5.8.31. X5771. 85770. IMPROVED PERFORMANCE 25 H.P. We carried out some bench tests to see how much we could… | ||
| img010 | Vehicle performance, component testing, and achieved speeds on a track. | ||
| View original record | -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 with a cut-out. The… | ||
| img011 | Graph showing engine performance tests conducted at Brooklands in August 1931. | ||
| View original record | 12 GIV BROOKLANDS TESTS AUG 1931 R.M.27 CHINA UNIT 112I SHAFT CO OPEN HIGH LIFT ROCKERS 5.65 C/R S.U. H.V.5. CARB. 11/50 AXLE RATIO STD 15% LARGER B.H.P 76.62 MPH 73.45 MPH M.E.P NO HOT SPOT INDUCTION… | ||
| img012 | Graph comparing Brake Horsepower vs RPM for five different exhaust system configurations. | ||
| View original record | RM.26 COMPARISON OF EXHAUST SYSTEMS. CHINA 11/2 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 25HP FISHTAIL ⑤ STD. 25… | ||
| img013 | Brooklands test results for a 12 G IV Close Coupled Four Seater car, comparing performance with different configurations. | ||
| View original record | R.M. 28 12 G IV BROOKLANDS TEST 14/8/31 CLOSE COUPLED FOUR SEATER WT. 32.25 CWT TYRES 6" FORT DUNLOPS 19" RIMS. 60 MPH = 3000 R.P.M. AXLE RATIO 11 X 50 CONDITION OF CAR AND UNIT LAP TIME LAP SPEED 1)… | ||
| img014 | Potential improvements to the 25 HP car to increase performance and smoothness. | ||
| View original record | 'SPEED' FILE ORIGINAL To R. from Hs. c. Sg. c. E. c. Sor. E. c. Dn. WV. Hsl/AM.5.8.31. X.5771. X.5010. INCREASED PERFORMANCE OF 25 H.P. If we can offer a 25 HP. car which has a maximum top speed of 75… | ||
| img015 | Design of rivetless bonnet hinges, with reference to practices by Morris and Armstrong Siddeley. | ||
| View original record | To Ey. From Hs/Lid. c. to SG. E. c. to Ey. ORIGINAL 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 | Scheme to eliminate rear brake groans and squeaks by using an anti-squeak type shoe. | ||
| View original record | To R. From Hs. c. to Sg. Por. c. to E. Da. c. to By. EP. ORIGINAL P.2 REAR BRAKE GROANS & SQUEAKS. x7360. Referring to our memo Hs/GWH.1/AD.29.5.31. where we suggest that by interconnecting the hand… | ||
| img017 | Performance tests conducted at Brooklands on three cars to compare speed and acceleration. | ||
| View original record | ORIGINAL To R. From Hs/Rm. c. to Sg. Wor. c. to E. Ba. c. to Hy. PM. Hs/Rm.1/AT. 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 on test vehicles, analyzing top speeds and acceleration with different engine and body configurations. | ||
| View original record | - 2 - The most interesting point is that with the C.O. open 18.G.IV. is only 1 M.P.H. slower than 16.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 | Road test report comparing a vehicle's performance with a Buick, noting acceleration, smoothness, and handling issues. | ||
| 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 comparing road wheel horsepower against engine RPM from Brooklands and China unit tests. | ||
| View original record | SHEET II BROOKLANDS TESTS 19/6/31 LAP SPEEDS 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 | Graph from Brooklands tests showing engine performance curves for Clutch HP and B.M.E.P. | ||
| View original record | H.S. 401 BROOKLANDS TESTS 19/6/31 LAP SPEED C.O. CLOSED 18GV 68.7 M.P.H. G.S.R. 14 63 M.P.H. 18 GV 35.7 CWTS JAPAN UNIT TWIN ZENITHS 26 M/M CHOKES 112° CAMSHAFT P II REAR SILENCER & FISHTAIL TIMING… | ||
| img022 | Blueprint graph comparing engine performance for two configurations from Brooklands tests, plotting BHP and BMEP against RPM. | ||
| View original record | SHEET I HS 402 BROOKLANDS TESTS 19/6/31 LAP SPEED C.O. OPEN. | 18 G IV 70.64 M.P.H | 16G IV 69.66 18 G IV 35.7 CWTS. JAPAN UNIT C/R. 5.25 TWIN ZENITH 26MM CHOKES 112° CAMSHAFT OPEN EXHAUST T.O.C. 11°… | ||
| img023 | Technical memorandum discussing timing and camshaft tests for the R-engine. | ||
| View original record | The 20/25 benefits from 'R' engine inlet cams To E. From Hs/Rm. c. to Ey. 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 valve timing and lift. | ||
| 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 40° B.B.C. we ought to try a shaft having this… | ||
| img025 | Experiments on various carburetter arrangements for a car engine. | ||
| View original record | To R. From Ha/Rm. c. to Sg. Wor. c. to Da. E. c. to By. ORIGINAL 87080 x5080. We have been conducting various experiments on the positioning of carburetters with a view to determining the best all… | ||
| img026 | Technical comparison of Claudel and Zenith carburetter systems and arrangements. | ||
| 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 | The characteristics of S.U. carburettors, their performance, and a comparison with Bentley induction systems. | ||
| View original record | -3- Hs/Rm.6/Wl.11.7.31.Cont'd. S.U.CARBURETTORS. 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 comparison graph of various carburettor arrangements on a PII engine with an aluminium 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.… | ||
| img029 | Performance graph comparing two different carburettor arrangements (Claudel and Zenith) for a 25 HP engine. | ||
| View original record | SHEET I COMPARISON OF CARBURETTER ARRANGEMENTS FOR 25 HP Hs. 413. JAPAN UNIT IV. G.8 5.45 C/R. OPEN EXHAUST Nº I TWO CLAUDELS. M.M. CHOKES. 24 m/m INDUCTION AS SHOWN Nº II TWO 36. VI. ZENITH. CHOKES… | ||
| img030 | Alternative designs and materials for rivetless bonnets, comparing aluminium to steel. | ||
| View original record | ORIGINAL To R. from Hs/Lid. c. Sg. Wor. c. E. Da. C. M. 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 | Quarterly complaints report detailing various issues with vehicle braking systems. | ||
| View original record | To R. From GWH. c. to Sg. Wor. c. to E. Da. c. to By. RP. FILING Hs/GWH.1/KE.29.7.31. 84117 RR. QUARTERLY COMPLAINTS. Item No.1. BRAKES. Front brake squeaks. We have tried experimentally every well… | ||
| img032 | Ongoing issues and resolutions for various vehicle components including shock absorbers, springing, and exhausts. | ||
| 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 | Recurring complaints and modifications for various vehicle components. | ||
| 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 | Fixes and improvements for various vehicle components, including the rear axle, telegauge, and starter motor. | ||
| 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 | Faults and their remedies for various vehicle components, including the oil pump, engine, dynamo, and lubrication system. | ||
| View original record | (5) this complaint. Item No.19. NOISY OIL PUMPS. Depots can cure this complaint by the fitting of the reservoir per Hd.206. The Works are also producing better gears on future cars, and are fitting… | ||
| img036 | List of modifications and improvements made to address various component complaints. | ||
| View original record | (2) 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 | Updates on a water pump fabric drive and a solution 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 | Proposal to conduct wind tunnel experiments to reduce windage and improve the aerodynamics of car bodies. | ||
| View original record | 'SPEED' FILE. ORIGINAL To R. from Hs/Rm. c. Sg. c. Scr. Da. c. E. Ev. Hs/Rm2/All4.8.31. 87830. 85830. STREAM LINED BODIES - R.R. CARS. Recently conditions of motoring have so altered that we believe… | ||
| img039 | Suggestion to sketch and test alternative car body shapes, referencing similar work done in America. | ||
| View original record | -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 of view of appearance… | ||
| img040 | Analysis of three instances of spring plate failures in a low inertia damper. | ||
| View original record | To E. from Hs/Lid. c. RV. c. Wgr. Mx. Hs/Lid/AD24.8.31 X.634. X.5010. LOW INERTIA DAMPER - SPRING PLATE FAILURES. RV6/G11.8.31. The total number of failures to date appears to be three. (1) On… | ||
| img041 | Analysis and composition of Price's and Wakefield's lubricating oils. | ||
| View original record | To R. From Hs. c. to Sr. Wor. c. to E. Da. c. to By. COPY. Hs.8/MJ.24.8.31. A.967. A.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 examination and composition of two oil samples, labelled '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 two oil samples, 'A' and 'B', after a heat test, measuring viscosity and asphalting bodies. | ||
| 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 history and performance of the auto friction damper on the 40/50 model. | ||
| View original record | To E. From Hs. Hs.12/MJ.24.8.31. y634: 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 | Quarterly complaint memo regarding cracked exhaust manifolds on Phantom I & 20 HP models and a request for testing modifications. | ||
| 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 about cracked exhaust manifolds for models Phantom I & P.2. | ||
| View original record | COPY. To Hs. (Derby) SEVRES. Hm/VA/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 | Distribution and testing of experimental Phantom I and 20 HP exhaust manifolds. | ||
| View original record | COPY. To Hm. From Hs/Lid. Hs/Lid.1/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 progress reports on experimental modified exhaust manifolds for P.I. and 20 HP cars. | ||
| View original record | COPY. To Hm. From Ha/Lid. c. to Sg. EXPERIMENTAL MODIFIED EXHAUST MANIFOLDS. We are particularly anxious to obtain some information on the behaviour of the modified exhaust manifolds for P.I. and 20… | ||
| img049 | Power output difference between balanced and unbalanced twin carburetters. | ||
| View original record | To R. from Hs/Rm. c. Sg. Wor. c. Ra. L. By. Hs/Rm.2/ADL 2.10.31. X7080. X7090. 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 carburettors. | ||
| View original record | RM. P30 COMPARISON OF POWER OUTPUT BALANCED & UNBALANCED TWIN CARBS. STANDARD CAMSHAFT VALVE LIFT .480 STANDARD HEAD 4.78 C.R TWIN CARBS 1.4 CHOKES B.H.P. B.M.E.P. R.P.M. EX IN .013 CLCE 7.5 51 55… | ||
| img051 | Power output difference between balanced and unbalanced twin carburettors. | ||
| View original record | To R. from Hs/Rm. c. Sg. Wor. c. Ex. L. By. Hs/Rm.2/ADL 2.10.31. x7080. x7090. BALANCED TWIN CARBURETTORS. We send you herewith curve Rm.P30 showing the difference in power output of the twin… | ||
| img052 | Recommendations for updating the battery ignition system. | ||
| View original record | To R. From Hs/Wst. c. to Sg. Wor. c. to E. Da. c. to By. Ha/Wst.J/WJ.14.10.31. X6095 X6096 BATTERY IGNITION. We understand that the question of bringing our battery ignition up to date will shortly… | ||
| img053 | List of advantages for a primary coil, circular condenser, and contact breaker lever. | ||
| View original record | 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 for less… | ||
| img054 | List of suggestions and observations for ignition system components including the distributor, insulated lever, governor, and contact breaker levers. | ||
| 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. Ds. RV ORIGINAL Hs/wst.4/AM 5.10.31. X4254 X7685 DELCO-REMY VACUUM OPERATED AUTOMATIC ADVANCE. The Delco-Remy Co. have produced a new system of effecting… | ||
| img056 | Road test report on a 1931 Chrysler 6 Cylinder and Morris Isis. | ||
| View original record | ORIGINAL To R. from Hg/Bn. c. to Sg. Wor. c. to Da. M. c. to Hy. Hs/Bn.T/KT.27.10.31. x404 x3531. ROAD TESTS, 1931 CARS. CHRYSLER 6 Cyl. 73 X 111 mm. 2794 cc. This car has almost the same acceleration… | ||
| img057 | Performance analysis and review of a 20 HP Wizard 2610 cc car. | ||
| 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 | Contemporary automotive features including dashboards, batteries, lamp controls, and accessories. | ||
| View original record | (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. A double battery was shewn… | ||
| img059 | Electrical equipment trends observed at the Olympia Motor Show, covering ignition, dynamos, horns, and instruments. | ||
| View original record | To R. from Hs/Wst. c. to Sg. Wor. c. to E. Da. c. to Hy. ORIGINAL Hs/Wst.1/KT.30.10.31. Y3374 ELECTRICAL EQUIPMENT AT OLYMPIA. Ignition. The Lorraine engine had its battery ignition distributor… | ||
| img060 | Dashboards, 24-volt batteries, lamp controls, and other electrical accessories for cars. | ||
| View original record | (2) Hs/Wst.1/CLT.R.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… | ||
| img061 | Interesting features from the 1931 Motor Show, focusing on engine mounting. | ||
| View original record | To R. from Hs/Ltd. c. to Sg. Wor. c. to E. Da. c. to Hy. ORIGINAL Hs/Ltd.2/KT.31.10.31. X631 X3531 MOTOR SHOW 1931. ------------------ There are several features exhibited at the motor show which are… | ||
| img062 | Technical report on gearbox and steering technologies, comparing competitor features like synchromesh and flexible shackles. | ||
| 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 page detailing observations on competitors' car designs, focusing on flexible shackles, cooling systems, and radiator 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 | Competitor car features, focusing on 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 specifications, liner manufacturers, and developments in hydraulic dampers. | ||
| View original record | -5- 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 strength 17-20 tons/sq.in.… | ||
| img066 | Report notes on ignition systems and induction pipe layouts, with a diagram of an intake manifold. | ||
| View original record | -6- 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 ignition systems; on the Chrysler… | ||
| img067 | Brief test run of a Hillman Wizard '75' car, detailing its particulars and general impressions. | ||
| View original record | He/Jsd.2/CT.H.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 performance test report comparing a competitor's car (Wizard 75) to a Rolls-Royce 25HP. | ||
| View original record | HS/Lid.2/KT.31.10.31.contd. -3- portion of pedal movement engages the clutch and consequently care has to be excercised in using it. The steering is the best feature of the car and is remarkably good.… | ||
| img069 | Performance comparison note between a 20/25 HP chassis and a Hillman Wizard. | ||
| View original record | Hs/Lid.2/ACT.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 | Letter from Cadillac Motor Car Company discussing developments in 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: Subj: Propeller Shaft. Replying to Hs/Gry2/MJ I attach copy of note… | ||
| img071 | Page discussing specifications for Oakland cars and Phantom II shafts, including balance and thickness. | ||
| View original record | -2- (5) Oakland cars run through within 3/4 oz. incl. 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 illustrating the front and rear mounting of a Plymouth engine. | ||
| 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 | Blueprint comparing four different designs of flexible spring shackles used by various manufacturers. | ||
| 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 for the windings of an outside primary ignition coil. | ||
| 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 the critical speeds of drive shaft tubes and providing a formula. | ||
| View original record | COPY. MECHANICS UNIVERSAL JOINT COMPANY. Division of Borg-Warner Corporation ROCKFORD, ILLINOIS October 19, 1931. C.A.S. Engineering Company, 3-132-140 General Motors Bldg. Detroit, Michigan.… | ||
| img076 | Effects of friction torsional vibration dampers on crankshaft critical speed and vibration period. | ||
| View original record | To M. from Hs/Gry. c. to SG. Wor. c. to E. Da. c. to Hy. 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 | Recommending the purchase and evaluation of a small Fiat car for the 'Peregrine' class. | ||
| View original record | To H. From Hs. c. to Sg. Wor. c. to E. Da. c. to By. Hs.2/WJ.13.11.31. X535. X4027. SMALL CAR REPRESENTATIVE OF PEREGRINE. It was agreed some time ago that we should look around to see whether we… | ||
| img078 | Technical assessment and test report of a 2.5 Litre Fiat Saloon. | ||
| View original record | Ha/Rm.1/WJ.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. 2516 cc. Wheel Base 9 ft. 1½… | ||
| img079 | Vehicle performance and handling report, comparing it to competitor models. | ||
| View original record | -2- Ha/Rm.J/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 criticisms of the Diamond engine mounting, considering a separate gearbox. | ||
| View original record | To R. From Hs. c. to Sg. Wor. c. to E. Da. c. to Hy. ORIGINAL DIAMOND ENGINE MOUNTING. The design of Diamond engine mounting so far has been on the basis of a conversion scheme which could be applied… | ||
| img081 | Results of tests on self-adjusting hydraulic shock absorbers. | ||
| View original record | To R. from Hs/Rm. c. Sg. c. WDR. E. c. Da. RV. X.235 X.7920. X.5520. Hs/Rm.2/AHD 9.11.31. SELF ADJUSTABLE HYDRAULIC SHOCK ABSORBERS. In view of your suggestion that it might be possible to make the… | ||
| img082 | Methodology and conditions for testing the movement of shock damper levers. | ||
| View original record | To R. from Hs/Les. c. Sg. c. WGR. H. c. Ra. W. 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 table comparing rear damper performance at various speeds on two different road surfaces. | ||
| View original record | Time in secs. to complete 360° of the O.S. rear damper in an upward direction Specification Speed ROAD SURFACE "A" ROAD SURFACE "B" of rear dampers. in MPH. Outward direction Inward direction Outward… | ||
| img084 | Comparing clutch spring loads and pedal pressures for the 25 HP and 40/50 models. | ||
| View original record | To Da. from Hs/Rm. 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 very… | ||
| img085 | Fitting of a Bosch dynamo and comparing a 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 | Investigation into cross steering tube load, permanent set, and wear on ball pads. | ||
| 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 on a 29 HP 8 Cylinder Chrysler, detailing its performance and characteristics. | ||
| View original record | To. R. from Rm. c. Sg. Mor. c.c. Da. E. By. Hs/Rm.1/NE.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 fitted… | ||
| img088 | Performance and handling review of a vehicle, comparing it to competitor models. | ||
| 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 | Testing Maybach cars and issues with fitting their clutches to a 14-MX car. | ||
| View original record | ORIGINAL To R. From Hs. c. to Sg. Wor. c. to E. Ds. c. to Ry. X4531 X2200 MAYBACH CAR. Rn. has gone to Berlin. The Motor show is at present being held there and he will try the different types of… | ||
| img090 | Test report on an 8-cylinder supercharged Mercedes from the 1931 Berlin Motor Show. | ||
| View original record | To R. From Hs/Rs. c. to Sg. Wor. c. to E. Da. Hy. BERLIN MOTOR SHOW. 1931. 8 CYL. SUPERCHARGED MERCEDES. x651. x407. We tried the 7653 C.M. Mercedes which has a bore and stroke of 95 X 135 m.m. The… | ||
| img091 | Bonnet ventilators, shock dampers, and central lubrication systems with accompanying diagrams. | ||
| 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 | Technical memo discussing carburettor silencers and a crude interior heating scheme with a diagram. | ||
| View original record | - 3 - Hs/Rm.R.A.T.D.3.5.31.cont. in front of the front axle. Chryslers, Pacard, and in fact most cars are doing this. The main advantage as far as we can see is accessibility because there does not… | ||