Rolls-Royce Archives
| Identifier | Entry | ||
| Scan001 | High-speed steering wobbles caused by unbalanced Dunlop inner tubes. | ||
| View original record | No. 4657 BJ20/DN1.9.25. TO R. c. to BY & Hs FROM BJ. HIGH SPEED STEERING WOBBLES. In R1/M22.8.25, you write as follows :- "Regarding the present chassis I think we are bound to issue these, and it… | ||
| Scan002 | The reliability of Houdaille hydraulic dampers for high-speed steering wobbles. | ||
| View original record | H.R. 493a (50 H) (P.D. 31. 12-6-25) J.H.B. EXPERIMENTAL REPORT. Expl. No. 1457 REF Hs1/LGK.9.25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to WOr. STEERING - HYDRAULIC DAMPERS. X457… | ||
| Scan003 | Causes and potential solutions for high-speed steering wobbles. | ||
| View original record | To BY. from R. c. to CJ. BJ. c. to PN. CWB. c. to Hs. DA. +457 R1/M1.9.25. X.457 X.8430 X.8520 STEERING - HIGH SPEED WOBBLES. Many thanks for your suggestion that inertia damping might be used in… | ||
| Scan004 | Vehicle dynamics, focusing on gyroscopic movements, damping, and weight reduction. | ||
| View original record | contd :- -2- a hillock the other. Through the irregularity of the road sometimes these gyrostatic movements are resisted by the shock of the irregular road surface. Sometimes they are assisted by the… | ||
| Scan005 | Tests conducted to understand high-speed steering wobbles. | ||
| View original record | R.R. 493a (30 H) (D.D. 31, 12-6-25) J.H.D. xC57 EXPERIMENTAL REPORT. Exptl. No. REF: HsG/LC2.9.25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to WCY. HIGH SPEED STEERING WOBBLES. 457… | ||
| Scan006 | Inquiry to Dunlop Rubber Co. regarding testing facilities for the dynamic balance of wheels and tyres. | ||
| View original record | 457 Hs/Rn2/LG. 2nd. Sept. 1925. The Dunlop Rubber Co., Fort Dunlop, Erdington, Birmingham. Dear Sirs, For the attention of Mr. Healey. Development Dept. Mr. Royce is under the impression that the… | ||
| Scan007 | Inquiry to the Cambridge Instrument Co. regarding the testing of dynamical balance for low-pressure tyres. | ||
| View original record | 4457 Hs/Rml/LG. 2nd. Sept. 1925. The Cambridge Instrument Co., Cambridge, England. Dear Sirs, For the attention of - Collins Esq. An occasion has recently arisen as to the relative accuracy of the… | ||
| Scan008 | Experimental apparatus built to investigate high-speed steering wobbles. | ||
| View original record | To Hs. from DA. X457 DA2/M2.9.25. HIGH SPEED STEERING WOBBLES. X.457 X.401 Thank you for your Hs/Rm2/LG31.8.25. Over the weekend we have constructed an apparatus rather similar to the sketch we sent… | ||
| Scan009 | Concerning high-speed steering wobbles. | ||
| View original record | R.R. 493a (50 H) (D.D. 31, 12-6-25) J.H.D. 4457 EXPERIMENTAL REPORT. Expl. No. REF Hs/Rm2/LG3. 9. 25. To R. from Hs/Rn. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. HIGH SPEED STEERING WOBBLES.… | ||
| Scan010 | High-speed steering wobble, its causes, and contributing factors like brakes and tyres. | ||
| View original record | R.R. 493a (50 H) (D.D. 31. 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF:Hs/Rm2/LG3.9.25. point, drastic alteration in the present standard design of the front of the car will be necessary to… | ||
| Scan011 | The causes of front axle wobble and the application of damping devices to prevent it. | ||
| View original record | R.R. 499A (50 H) (D.D. 31. 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF. Hs/Rm2/LG39.25. elements previously mentioned. It should be pointed out that a front axle will not start to vibrate… | ||
| Scan012 | Investigating and solving vehicle wobble through damping in steering and axles. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. -4- EXPERIMENTAL REPORT. Expl. No. REF Hs/Rn2/LG3.9.25. a wobble. The available means of applying the damping are :- (1) In the steering system. (2) On the… | ||
| Scan013 | Report on tests conducted in France. | ||
| View original record | To BJ. from Hs. X457 Hs7/LG4. 9.25. X5840 TESTS IN FRANCE. Referring to BJ19/DN3. 9.25. We attach a report which we have received from France as requested in your memo. ref. above. Hs. | ||
| Scan014 | Letter discussing tyre pressure tests and the causes of steering wobble on chassis 9-G-111. | ||
| View original record | COPY. Hotel de France, Chateauroux, Indre, France. GWH1/Crn24.8.25. To Hs. From G.W.Hancock. ---------------- CHASSIS 9-G-111. ---------------- We have received your letter of the 22nd. inst. and have… | ||
| Scan015 | Report on steering wobble tests for the 20 HP car. | ||
| View original record | To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. H57 Hs5/LG4.9.25. H840 X457 STEERING WOBBLES on 20 HP. CAR. We attach a report of tests for steering wobbles carried out on 9-G-111… | ||
| Scan016 | Tests for steering wobbles on chassis 9-G-111. | ||
| View original record | R.R. 495A (50 H) (D.D. 31. 12-6-25) J.H.D EXPERIMENTAL REPORT. Expl. No. REF GWHl/Crn30.8.25. Hotel de France, Chateauroux, Indre, France. To Hs, From G.W.Hancock. CHASSIS 9-G-111. Tests for steering… | ||
| Scan017 | Report concluding that after re-balancing the wheels, the steering was perfect with tyre pressures at 40 lbs. | ||
| View original record | contd :- -2- of private owners would be nervous if they had the same conditions. After balancing up wheels once more, the steering was perfect. Tyre pressures under these tests were 40 lbs.… | ||
| Scan018 | Mechanical device to counteract high-speed steering wobbles. | ||
| View original record | R.R. 453a (50 M) (D.D. 31. 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expt. No. X 457 REF: Hs/Rml/LG4. 9. 25. To R. from Hs./Rm. c. to CJ. BY. c. to RG. E. c. to DA. BY. c. to Wor. HIGH SPEED STEERING… | ||
| Scan019 | Proposal for an anti-wobbling device by strengthening shock absorbers and adding a torsional spring. | ||
| View original record | contd :- -2- It appears to us that there are possibilities in this idea if it was given a fair chance. If the shock absorber arms and ball ends were strengthened, the rod replaced by a tubular sleeve… | ||
| Scan020 | Confirmation of a wire from Royce regarding gyrostatic wobble and wheel precession. | ||
| View original record | S.R. 235A (100 T) (S.H. 159, 11-8-20) G 2800 X457 CONFIRMATION OF WIRE. COPY to OJ. " " WD. " " RY. WEST WITTERING. 4. 9. 25. CLARKE. ROYCAR. DERBY. IS THERE SUCH A THING AS A GYROSTATIC WOBBLE AND… | ||
| Scan021 | Tests investigating high-speed steering wobbles. | ||
| View original record | R.R. 495A (50 H) (D.D. 31. 12-6-25) J.H.D. EXPERIMENTAL REPORT. To R. from Hs./Rm. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. Expl. No. 4457 REF: Hs/Rm2/LG4.9.25. HIGH SPEED STEERING WOBBLES.… | ||
| Scan022 | Confirmation of a telegram from R. (Royce) to Clark regarding a 'gyrostatic wobble' issue and arranging a meeting. | ||
| View original record | X487 CONFIRMATION OF TELEGRAM RECEIVED FROM R, on 4.9.25. "CLARK. ROYCAR DERBY. X.457. X.8430. IS THERE SUCH A THING AS A GYROSTATIC WOBBLE AND CAN IT BE AT WHEEL SPEED WITH SUITABLE MOUNTING. IS IT… | ||
| Scan023 | Technical memorandum discussing the phenomenon of front wheel wobbles, specifically addressing gyroscopic wobble. | ||
| View original record | To R. from EFC. c. to CJ. DA. c. Hs. X457 EFCg/T4.9.25. FRONT WHEEL WOBBLES. In confirmation of our telephone conversation and in answer to your telegram, I am coming to Chichester with Hs. on Monday… | ||
| Scan024 | Continued discussion on the physics of wheel motion, specifically conical oscillation and precession. | ||
| View original record | Contd. -2- EFC6/T4.9.25. the period of revolution, also applies. If the body has three equal principal moments of inertia it is equi-momental to a sphere, in which case the combined effect of the… | ||
| Scan025 | Gyroscopic wobble and precession in relation to wheel speed and brake drums. | ||
| View original record | Contd. -3- EFC3/T4.9.25. which causes the precession. There is this difference, that whereas the speed of ordinary precession is reduced as the wheel speed is increased, the speed of conical… | ||
| Scan026 | High-speed steering wobble observed during testing of a Lambda Lancia car. | ||
| View original record | R.R. 493a (50 H) (D.D. 31. 12-6-25) J.H.D. EXPERIMENTAL REPORT Expl. No. +457 REF: Hs1/LG5.9.25. To R. from Hs. c. to CJ. BJ. c. to BG. E. c. to DA. EY. c. to Wor. LAMBDA LANCIA CAR. +4048 We have had… | ||
| Scan027 | Chassis twisting, frame distortion, and high-speed wobble. | ||
| View original record | R.R. 493A (50 HD) (D.D. 31. 12-6-25) J.H.D. EXPERIMENTAL REPORT -2- Expl. No. REF: HSL/LG5. 9.25. As far as we could see the whole chassis was twisting transversally about some point towards the rear… | ||
| Scan028 | Engine and vehicle specifications. | ||
| View original record | R.R. 495a (50 H) (D.D. 31. 12-6-25) J.H.D. -3- Expl. No. REF. Hsl/LGS. 9.25. EXPERIMENTAL REPORT. Engine :- Bore 3" Stroke 4.8" Capacity 2.12 litres. Wheel base 10 ft 4½" Track 4 ft 5½" Direct drive… | ||
| Scan029 | Blueprint showing a detailed assembly of a mechanical component, likely a carburetor. | ||
| View original record | ", | ||
| Scan030 | The causes of high-speed wheel wobble, concluding that wheel balancing is the most effective cure. | ||
| View original record | W/N. c. to EY. c. to HS. c. to BP. K457 Hm's Department.(Hm.is absent). NRC3/EW9.9.25. Chassis 123-EM, 16-LM, 103-MC, & 15-MC. In reply to your Br7/H.1.9.25, we do not agree that slack in the pivot… | ||
| Scan031 | The steering and braking of a Lambda Lancia car. | ||
| View original record | R.R. 493A (50 H) (D.D. 31. 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. 4457 REF Hs/Rm2/LG10.9.25. To R. from Hs/Rm. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. LAMBDA LANCIA CAR. 4457 74048… | ||
| Scan032 | The importance of wheel balance in reducing road shocks transmitted to the steering. | ||
| View original record | contd :- -2- steering is that road shocks, in our experience, are reduced. (b) Wheel balance. The makers had taken the trouble to balance all the wheels on this car. We found that this was very… | ||
| Scan033 | High-speed steering wobbles in a Hispano Suiza, with comparisons to the Phantom. | ||
| View original record | R.R. 493a (50 H) (D.D. 31. 12-6-25) J.B.D. EXPERIMENTAL REPORT. Expl. No. 4457 REF: Hs/Rm3/LG10.9.25. To R. from Hs/Rm. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. HIGH SPEED STEERING WOBBLES.… | ||
| Scan034 | Letter to Dunlop Rubber Co. regarding the fitting of balloon tyres to Michelin disc wheels for experiments on high-speed steering wobbles. | ||
| View original record | +457 Hs/Rml/LG. 10th. Sept. 1925. Messrs. The Dunlop Rubber Co., Fort Dunlop, Erdington, Birmingham. Dear Sirs, For the attention of Mr. Paull. We have a pair of Michelin disc wheels which we have… | ||
| Scan035 | Alterations to pivot lean to resolve high-speed steering wobbles. | ||
| View original record | To R. from Hs/Rm. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. +457 Hs/Rm4/LG10.9.25. HIGH SPEED WOBBLES. +suto Alteration to pivot lean. We have altered the pivot lean on a car from standard… | ||
| Scan036 | Improvements to the New Phantom and India models' steering to address slow speed wobbles and road shocks. | ||
| View original record | To BY. HS. from R. c. to CJ. BJ. c. to RG. Wor. c. to DA. E. c. to PN. CWB. 1457 R1/M10.9.25. NEW PHANTOM & INDIA. RE. STEERING. X.3430 X.401 SLOW SPEED WOBBLES & ROAD SHOCKS. X.5430 X.457 Regarding… | ||
| Scan037 | Mitigating high-speed wobbles and road shocks through tyre selection, balancing, and a new damped pendulum lever design. | ||
| View original record | Contd :- o2o the same object we have sent a new box with larger dia. worm so as to further reduce the feeling of road shocks. A damped pendulum lever will be used for this also as soon as a simple… | ||
| Scan038 | Evaluation of Derihon hydraulic shock absorbers against Houdaille models. | ||
| View original record | To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. x459 Hs4/LG11.9.25. HYDRAULIC SHOCK ABSORBERS. f4046 We have seen a sample of the Derihon shock absorber and we shall receive some… | ||
| Scan039 | High-speed steering wobbles in a Hispano car, comparing it to the Phantom. | ||
| View original record | R.R. 493a (50 H) (D.D. 3L 12-6-25) J.H.B. +457 EXPERIMENTAL REPORT. Expl. No. REF Hs/Rm2/LG11.9.25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. HIGH SPEED STEERING WOBBLES.… | ||
| Scan040 | Letter from Dunlop regarding the supply of Disc Wheels with Well-base rims for Micehlin and Hispano Suiza cars. | ||
| View original record | Telegraphic Address. "DUNLOPS, BIRMINGHAM." Telephone No. BIRMINGHAM CENTRAL 4108. PRIVATE BRANCH EXCHANGE. 25 LINES. Registered Offices. DUNLOP HOUSE, I, ALBANY ST. LONDON, N.W.I. BY APPOINTMENT… | ||
| Scan041 | The delay and steering modifications for the New Phantom's 10,000-mile test in France. | ||
| View original record | EXPERIMENTAL REPORT. Expl. No. 4457 REF: Hs2/LG12.9.25. S E C R E T. To BJ. from Hs. 10,000 MILES TEST IN FRANCE ON NEW PHANTOM. It is certain that this car will not be ready to start on the… | ||
| Scan042 | Dissatisfaction with the Houdaille part and arrangements for a 10,000-mile car test. | ||
| View original record | Contd :- -2- Here again we are not satisfied that we have got the best we can do. Neither R. or ourselves are satisfied with the Houdaille, and samples of other makes are being procured. We arranged… | ||
| Scan043 | High-speed steering wobble caused by wheel imbalance, comparing the Silver Ghost and Phantom models. | ||
| View original record | To B.J. from Hs. [Handwritten Annotations] X457 (underlined) X457 X8430 (crossed out) [Typed Text] Hs3/LG12. 9. 25. With reference to the attached memos. in connection with balance of wheels. This… | ||
| Scan044 | High-speed wobbles, comparing a Hispano car to the EAC and testing steering modifications on a Phantom car. | ||
| View original record | H.H. 493A (50 Hd) (D.D. 31. 12-6-25) J.H.D. 4457 EXPERIMENTAL REPORT. Expl. No. REF Hs/RmL/LG14.9.25. To R. from Hs/Rm. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. HIGH SPEED WOBBLES+ 4457… | ||
| Scan045 | Investigating the causes and characteristics of wheel wobble using a dynamometer. | ||
| View original record | R.R. 493a (50 H) (D.D. 31, 12-6-25) J.H.D. -2- EXPERIMENTAL REPORT. Expl. No. REF Hs/Rml/LG14.9.25. tinctly objectionable. We have not tried this test on a second car yet; it appears to us so far that… | ||
| Scan046 | High and low speed steering wobbles through the use of hydraulic and friction dampers. | ||
| View original record | To CJ. from R. c. to Hs. c. to EY. c. to Da. c. to PN. c. to CWB. STEERING. R7/M14.9.25. X. 8430 X.457 X.1152. Regarding the hgih speed steering wobbles we have reported what we are doing. We are… | ||
| Scan047 | Technical memo discussing the causes of high-speed wheel wobble and proposed experiments to resolve it. | ||
| View original record | To Hs. from R. c. to CJ. Wor. c. to BY. DA. c. to EFC. CWB. tu57 STEERING. X.8430 X.401. X.458 Naturally you will still be pressing forward the tests to ascertain why the high speed wobbles appear at… | ||
| Scan048 | Wheel wobble, tramping speed, tyre pressure, and pivot angles. | ||
| View original record | contd :- -2- parts of the wheels and axles, we shall get a tendency to wobble when the tramping speed sychronises with the road wheel speed, but we want to be sure of this. As you know we can lower… | ||
| Scan049 | High-speed steering wobbles, comparing different front axle configurations. | ||
| View original record | EXPERIMENTAL REPORT. To R. from Hs./Rn. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. Expl. No. +457 REF Hs/Rnl/LG15.9.25. HIGH SPEED STEERING WOBBLES. We have compared the standard front axle… | ||
| Scan050 | Axle modifications and brake performance, investigating vehicle wobble. | ||
| View original record | 493A (50 H) (D.D. 31. 12-6-25) J.H.B. EXPERIMENTAL REPORT. -2- Exptl. No. REF Hs/Rm/LG15.9.25. has been increased and increased in weight which would increase its transverse moment of inertia. The… | ||
| Scan051 | Investigating the causes of high-speed steering wobbles. | ||
| View original record | R.R. 495a (50 H) (D.D. 31. 12-6-25) J.H.D. +L57 Expl. No. REF HS/Rm2/LG15.9.25 EXPERIMENTAL REPORT. To R. from Hs/Rm. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. HIGH SPEED STEERING WOBBLES.… | ||
| Scan052 | The causes of wheel wobble, with a diagram illustrating the test setup. | ||
| View original record | R.R. 498a (50 H) (D.D. 91. 12-8-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/Rm2/LG15.9.25. INDICATOR. we had anticipated from the movement with the wheels running slowly which appeared to be… | ||
| Scan053 | Tests conducted to understand high-speed wheel wobble on tyres. | ||
| View original record | R.R. 493a (50 H) (D.D. 21. 12-6-25) J.H.L. -3- Exptl. No. REF: Hs/Rm2/LG15.9.25. EXPERIMENTAL REPORT. on the tyres, the wobbles instantly vanished completely. This was with balanced tyres. We repeated… | ||
| Scan054 | The causes of tyre wobble, including damping, tread pattern, and road surface moisture. | ||
| View original record | R.R. 493a (50 H) (D.D. 21. 12-6-25) L.H.L. EXPERIMENTAL REPORT. -4- Expl. No. REF: Hs/Rm2/LG15.9.25. takes place. We believe the damping of the tyre is also important, but in addition that we shall… | ||
| Scan055 | Letter to Dunlop Rubber Co. inquiring about wheel specifications, compatibility, and cost. | ||
| View original record | X457 Hs/Rm2/LG. Expl: Dept: 16th. Sept. 1925. Messrs. The Dunlop Rubber Co., Fort Dunlop, Erdington, Birmingham. Dear Sirs, Vehicle Equipment Section. For the attention of A. Lodge Esq., We enclose… | ||
| Scan056 | High-speed steering wobbles caused by tyres running out of true. | ||
| View original record | R.R. 493A (50 H) (D.D. 31. 12-8-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. 4457 REF: Hs/Rm/LG16.9.25. To R. from Hs/Rm. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. HIGH SPEED STEERING WOBBLES.… | ||
| Scan057 | Reduction in recommended tyre pressure for the instruction book to mitigate wobbles and road shocks. | ||
| View original record | To [REDACTED] Copy to... Hs. "NEW PHANTOM" AND "INDIA" STEERING. SLOW SPEED WOBBLES AND ROAD SHOCKS. Handwritten: X457 As R1/M10.9.25 recommends that tyres should be pumped to 55 lbs. pressure, C.J.… | ||
| Scan058 | Brief report on tests of hydraulic dampers to address high-speed steering wobbles. | ||
| View original record | To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. +457 HIGH SPEED STEERING WOBBLES. +8430 We shall be sending you a full report on the tests carried out today. Briefly, the results… | ||
| Scan059 | Phenomenon of high-speed wobbles in a vehicle chassis. | ||
| View original record | X457 R. C. BJ. C. HS. BY6/H. 17.9.25. ----------------- HIGH SPEED WOBBLES. ----------------- Hs' memos Hs/RM1/LG. 15 9.25. and Hs/RM2/LG. 15.9.25. have just come to hand. It might appear that my… | ||
| Scan060 | Correcting a previous analysis of high-speed wheel wobble. | ||
| View original record | The Firs Matlock 17. 9. 25 X457 Ro I am feeling a bit run down left early today & may not be in tomorrow hence this note. I made an obvious error which yourself or Rm may have noticed & corrected I… | ||
| Scan061 | Analysis of wheel behaviour and path during a full lock turn, comparing two different curve representations. | ||
| View original record | & is dashed on to ground in the position e.g "toeing in" ~~thus~~ impact of wheel on ground & road drag caused by full lock slavvy wheel in turn swings this wheel back & brings wheel in air again to… | ||
| Scan062 | Test results for high-speed steering wobbles and proposing further tests on wet or greasy roads. | ||
| View original record | To Hs. from E. X.457 E1/M17.9.25. HIGH SPEED STEERING WOBBLES. It is very interesting to note the results you have obtained by running the front wheels of the car on smooth drums, a test which I… | ||
| Scan063 | Wheel balancing issues and steering complaints for the 'Silver Ghost' model. | ||
| View original record | R.R. 498a (50 M) (B.D. 31. 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expt. No. 7457 REF: Hs1/LGl8.9.25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. 'SILVER GHOST' STEERING. K9430 We… | ||
| Scan064 | Tests to understand the cause of high-speed steering wobbles. | ||
| View original record | R.R. 493a (50 M) (O.D. 21. 12-8-25) J.H.L. +457 EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rm2/LG18.9.25. To R. from Hs/Rm. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. HIGH SPEED STEERING WOBBLES.… | ||
| Scan065 | Tests conducted on wheel wobble and its characteristics. | ||
| View original record | K.R. 495a (50 H) (D.D. 91. 12-6-25) J.H.L. EXPERIMENTAL REPORT. -2- Expl. No. REF:Hs/Rm2/LG18.9.25. (4) Out of balance in the proportions likely to be met with in practice is quite incapable of… | ||
| Scan066 | Wheel wobble, its causes related to toe-in/out, and axle behaviour. | ||
| View original record | R.R. 493x (50 H) (D.D. 91, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF Hs/Rm2/LG18. 9. 25. (7) When the wheels are given an excess of toe in the wobbles becomes worse - when a toe out, they… | ||
| Scan067 | Analyzing the self-exciting dynamics of high-speed wheel wobble. | ||
| View original record | R.R. 495a (50 H) (D.D. 91. 12-6-25) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. REF: Hs/Rm2/LG18.9.25. the wheel manage to give the axle a minute criss cross movement. This little movement is… | ||
| Scan068 | Analyzing the gyroscopic effects on high-speed wheel wobble. | ||
| View original record | R.R. 403a (50 H) (D.D. 21. 12-6-25) J.H.L. EXPERIMENTAL REPORT. -5- Expl. No. REF Hs/Rm2/LG18.9.25. other than its natural period. Section 2. of the report is explained as follows. When water is… | ||
| Scan069 | Inquiry into using slow-motion kinematograph film to investigate high-speed steering wobble. | ||
| View original record | To PN. from Hs/Rm. 4457 Hs/Rm1/LG18.9.25. HIGH SPEED STEERING WOBBLES. We have a car fitted up with the front wheels running on a pair of revolving drums. By this means we are able to observe the high… | ||
| Scan070 | Proposing the use of slow-motion cinema to investigate high-speed steering wobbles. | ||
| View original record | X457 To Hs. PNS/EH 21.9.25. HIGH SPEED STEERING WOBBLES. In reference to your memo HS/RML/LG 18.9.25., I am not surprised to hear that pouring water on the drums instantly stopped the wobbles, as… | ||
| Scan071 | Outlining the policy for correcting steering wobbles on Silver Ghost and Phantom models. | ||
| View original record | To H. Hs. By. Ev. N.) from BJ. 4451 CORRECTING STEERING WOBBLES. BJ5/H22.9.25. At CJ's request, I am forwarding the following extract from Sales Conference Minutes of to-day:- "Correcting Steering… | ||
| Scan072 | Postscript memorandum detailing three traced cases of steering wobble on 'Silver Ghost' chassis. | ||
| View original record | To R. ) from B.J. Hs. ) By. ) BP. ) N. ) BJ5/H22.9.25 (Cont'd.) --2-- P.S. Since writing the foregoing, we have received the following information from W. (Hm/WW12/W22.9.25):- "We have no list of… | ||
| Scan073 | High-speed wobbles and a test involving a torque tube on the front axle. | ||
| View original record | To Hs. from DA. +457 DA8/M23.9.25. HIGH SPEED WOBBLES. X.457 X.8420 It is understood that you will again run the car fitted with a torque tube to the front axle, so arranged as to make the pivots… | ||
| Scan074 | Modifications to the 20 HP steering system to address low-speed wobbles. | ||
| View original record | +457 To Hs. from DA. c. to CJ. BY. DA6/M239.25. 20 HP. STEERING. X.5430 X.457 X.5450 It is desired as soon as possible to get on the big worm to this chassis too. The design is practically ready and… | ||
| Scan075 | Report on high-speed steering wobbles and gyroscopic forces. | ||
| View original record | S/W (Hs). 457 CWB20/LH23.9.25. HIGH SPEED STEERING WOBBLES. ref. Hs/RM2/LG18.9.25. This exhaustive report is most interesting, and really does appear to give a satisfactory explanation of all the… | ||
| Scan076 | Solutions for high-speed steering wobble on the Phantom model. | ||
| View original record | 1457 to Hs. from DA. c. to CJ. BY. c. to EP. FN. DA1/M23.9.25. PHANTOM STEERING. VISIT OF HS. EP. RM. ON THURSDAY 22ND. INST. X.8430 X.457 X.401 To deal immediately with the question of high speed… | ||
| Scan077 | List of agreed-upon modifications and tests for vehicle components, including axles and wheels. | ||
| View original record | -2- wobbles. As soon as this .940 lead worm has been tested and agreed to, existing worms should be scrapped. (7) In order to take out weight, as an immediate move it is proposed to do more machining… | ||
| Scan078 | The weight savings of the latest Dunlop well-based wheel compared to the standard Dunlop wheel. | ||
| View original record | R.R. 495A (50 M) (D.D. 21. 12-8-25) J.H.L. EXPERIMENTAL REPORT. Expl. No. +457 REF: Hs3/LB25.9.25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. DUNLOP WHEELS. +3725 We find that… | ||
| Scan079 | Use of slow-motion film to investigate high-speed steering wobbles. | ||
| View original record | +457 To PN. from Hs/Rm. Hs/Rm2/LG26.9.25. HIGH SPEED STEERING WOBBLES. We thank you for your PN&/EH21.9.25 containing information re. slow motion kinematagraph film which we were thinking of taking.… | ||
| Scan080 | Theories on the cause of high-speed steering wobbles. | ||
| View original record | 4457 To CWB. from Hs/Rm. Hs/Rml/LG26.9.25. HIGH SPEED STEERING WOBBLES. We thank you for your CWB20/LH23.9.25. At the moment we are inclined to agree with your observation as to the commencement of a… | ||
| Scan081 | High-speed steering wobbles. | ||
| View original record | R.R. 493a (50 H) (D.D. 31. 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. 4457 REF Hs/Rm3/LG26.9.25. To R. from Hs/Rm. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. HIGH SPEED STEERING WOBBLES.… | ||
| Scan082 | The preference for axle rigidity in torsion for steering over equalised brakes. | ||
| View original record | Contd :- -2- steering and an axle held rigidly in torsion would be preferable, from the driver's point of view, to a perfectly equalised pair of brakes on an axle which could be made to assume a… | ||
| Scan083 | The performance and testing of three types of hydraulic shock absorbers. | ||
| View original record | X 457 EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rm/LG26.9.25. To R. from Hs/Rm. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wcr. HYDRAULIC SHOCK ABSORBERS. X8520 X457 We have tested three types of… | ||
| Scan084 | Testing of shock absorbers and their effectiveness in alleviating wobbles. | ||
| View original record | MADE AT CROXLEY contd :- -2- getting in the system. We are reducing the severity of the test as we consider that it is over-strenuous owing to the fact that the shock absorbers have no possible chance… | ||
| Scan085 | Tests for high-speed steering wobbles on a Silver Ghost fitted with torque control. | ||
| View original record | 457 To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. Wor. Hs/Rml/LG28.9.25. HIGH SPEED STEERING WOBBLES. x8420 With reference to DAS/M23.9.25! We have tried a car fitted with the torque control… | ||
| Scan086 | Investigations into high-speed steering wobbles. | ||
| View original record | R.R. 498a (50 H) (D.D. 31. 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. +457 REF. Hs/Rm1/LG29. 9. 25 To R. from Hs/R m. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to WOr. HIGH SPEED STEERING… | ||
| Scan087 | Tests conducted to mitigate steering wobble issues. | ||
| View original record | R.R. 495a (50 M) (D.D. 31. 12-8-25) J.H.L. EXPERIMENTAL REPORT. -2- Expl. No. REF Hs/RmL/LG29.9.25. They attained a small amplitude which could be maintained at a fixed speed, but died out as soon as… | ||
| Scan088 | Diagram comparing the effect on high-speed steering wobbles by removing the side-steering tube. | ||
| View original record | HIGH SPEED STEERING WOBBLES FRONT STANDARD PIVOT LEAN AND TOE-IN 7.25" BALLOON TYRES INFLATED 20 LBS/sq' COMPARISON OF EFFECT OF REMOVING SIDE-STEERING TUBE ON WOBBLES A. SIDE STEERING TUBE CONNECTED… | ||
| Scan089 | Diagram illustrating tyre contact patches under different pivot lean and wheel alignment settings. | ||
| View original record | FRONT LEAN OF TYRE (AROUND) FRONT LEAN OF TYRE 4° FORWARDS FRONT LOW G TYRE 8.20 FORWARDS FRONT FRONT LEAN 1/2 FORWARD FRONT PIVOTS VERTICAL FRONT LEAN OF PIVOTS 1" BACK FRONT LEAN OF PIVOTS 3/4" BACK… | ||
| Scan090 | Page marked with a stamp from the Print Room in Derby. | ||
| View original record | ROLLS-ROYCE, LIMITED PRINT ROOM, 29 SEP 1925 DERBY. | ||
| Scan091 | Letter from Dunlop regarding 'shimmy' (wheel wobble), comparative tyre wear, and enclosing a paper entitled 'Etudes sur le Shimmy'. | ||
| View original record | Telegraphic Address. "DUNLOPS, BIRMINGHAM." Telephone No. BIRMINGHAM CENTRAL 4108. PRIVATE BRANCH EXCHANGE. 25 LINES Registered Offices. DUNLOP HOUSE, I, ALBANY ST LONDON. N.W.I. BY APPOINTMENT DUNLOP… | ||
| Scan092 | High-speed steering wobbles, detailing tests on different tyre types from Dunlop. | ||
| View original record | R.R. 493a (50 M) (D.D. 31. 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. 1457 REF: Hs/Rnl/LGS.10.25 To R. from Hs/Rn. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. HIGH SPEED STEERING WOBBLES.… | ||
| Scan093 | Tests conducted to understand and mitigate hub wobble using different tyres and steering components. | ||
| View original record | R.R. 493a (50 H) (D.D. 31. 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF:Hs/RmL/LG6.10.25. We send you figures taken by a pencil in the end of the hub which demonstrate the relative amplitude… | ||
| Scan094 | Sketches comparing different axle and tyre configurations. | ||
| View original record | FRONT (E) AS (A) BUT WITH SPRINGS ON INSIDE OF S.S. TUBE ONLY. STUD ENDS TO TAKE THRUST LOADING? NOTE OFFSET FRONT (A) OF (D) FRONT N/S R.R. STD TYPE S.S. TUBE SOLID PIVOT + TRACK AS BEFORE (B) FRONT… | ||
| Scan095 | Folded sheet with a Print Room stamp in the bottom right corner. | ||
| View original record | ROLLS-ROYCE, LIMITED PRINT ROOM, 3 JAN 1925 DERBY. | ||
| Scan096 | Letter to the Dunlop Rubber Co. regarding a Michelin paper and tyre testing results on drums. | ||
| View original record | X457 Hs/Rml/LG. 6th. Oct. 1925. Messrs. The Dunlop Rubber Co., Fort Dunlop, Erdington, Birmingham. Dear Sirs, For the attention of Mr. Healey. Development Dept. Thank you for the Michelin Paper which… | ||
| Scan097 | Issues with Rapson tyres, specifically out of balance, out of truth, and steering wobbles. | ||
| View original record | To Hs. from Da. +457 DA5/M7.10.25. RAPSON TYRES AND STEERING WOBBLES. X.1238 X.457 X.401 We know that you do not like Rapson tyres, and that you have found them to be considerably out of balance and… | ||
| Scan098 | Analysis of wheel wobble, or 'shimmy', as conducted by the Michelin Tyre Company. | ||
| View original record | X457 8.10.25. ANALYSIS OF WHEEL WOBBLE BY THE MICHELIN TYRE COMPANY. CONTENTS OF THE PAPER :- 1. Definition. 2. Object of the tests. 3. Nomenclature of the parts concerned. 4. Method of measuring high… | ||
| Scan099 | The objectives and probable causes of wheel shimmy, based on tests conducted on a Renault L.S. 1923. | ||
| View original record | Contd :- -2- blows due to the inequalities of the ground on the steering and which are all the more accentuated when the steering is very light and tyre approaches low pressure proportions. (2) OBJECT… | ||
| Scan100 | Page from a paper discussing methods for identifying and measuring vehicle wobble and vibration. | ||
| View original record | contd :- -3- (3) IDENTIFICATION OF THE PRINCIPAL PARTS IN THE STEERING SYSTEM. In order to avoid any misunderstanding, we shew in illustration 1. the names of the parts which will be most often used… | ||
| Scan101 | Analysis of wheel shimmy, detailing its principal movements and effects on the chassis and steering system. | ||
| View original record | contd :- -4- 'comfort' tyres 880 X 160 mm; at 1.5 klgms. (21.4 lbs/sq.in.) inflation pressure, enabled us to announce the following. The wheel shimmy started on dry and even ground at a critical speed… | ||
| Scan102 | Analysis of wheel wobble, axle oscillations, and spring movement based on slow-motion kinematics and tests. | ||
| View original record | contd :- -5- the marks left on the ground of one of the front wheels (see Illustration No.2.) which shows the violence of the tyre when it scrubs on the ground which confirms the indication of our… | ||
| Scan103 | Page from a report discussing wheel shimmy, periodicity, and forces at critical speeds. | ||
| View original record | cntd :- -6- 50 m/m (2.0") If one considers that the successive compressions and extensions take place 10 to 12 times per second and the oscillation of the wheels about their steering pivots are… | ||
| Scan104 | Classification of tests for various vehicle components and conditions. | ||
| View original record | contd :- -7- (6) CLASSIFICATION OF TESTS. A. The road. Nature of the ground. { (Level and dry surface. (Level and damp surface. (Irregular surface, holes (etc. Direction of car. { (Straight.… | ||
| Scan105 | Analysis of 'shimmy' or 'wobble', discussing the influence of road conditions and tyre types. | ||
| View original record | contd :- -3- A. THE ROAD. Shimmy is much more violent, its oscillations are more regular, and it is sustained over longer periods when the ground is dry and smooth. On wet ground the intensity of the… | ||
| Scan106 | Study on the causes of wheel shimmy, focusing on tyres, speed, and wheel types. | ||
| View original record | contd :- -9- (a) A new tyre does not promote wheel wobble so violently as an old tyre: The shimmy starts less easily and is maintained for a smaller period. However, on badly worn tyres whose cords… | ||
| Scan107 | Analysis of wheel shimmy, exploring the effects of wheel weight, front brakes, and steering play. | ||
| View original record | CONTD :- -10- This wheel tends to slow up, while the other tends to accelerate and one can imagine an explanation of shimmy based on these considerations. Weight. (a) If one considerably increases the… | ||
| Scan108 | Technical analysis of steering wobble and shimmy, considering factors like play and castor angle on various cars. | ||
| View original record | contd :- -11- Inner lash In The new 12-HP. Renault without appreciable play, the steering has hardly any tendency to wobble. When play increases however, shimmy appears. If the phenomenon persists,… | ||
| Scan109 | Analysis of steering geometry, including wheel cant and pivot inclination, in relation to vehicle stability and shimmy. | ||
| View original record | contd :- -12- angle so that the tendency to shimmy will not be increased. It is not much use aiming at anti-castoring which increases the tendency of the steering to take charge and renders a hair-pin… | ||
| Scan110 | Continued analysis of wheel shimmy, discussing the effects of pivot axis placement and track width adjustments on steering performance. | ||
| View original record | contd :- -13- ought to be brought back in the plane of the tyre. Firstly because the steering will gain in sweetness, secondly, because the tangential reaction of the ground will have less chance to… | ||
| Scan111 | Page from a report analyzing wheel shimmy and steering forces, including calculations and test results. | ||
| View original record | contd :- -14- became heavy and objectionable. We placed friction in the stop pivots which opposed starting of shimmy. This did not stop it because the arm of the lever which makes the wheel oscillate… | ||
| Scan112 | Analysis of steering system components, including the pivot axis and lever joints, in relation to reducing friction and shimmy. | ||
| View original record | contd :- -15- selectiveness of the steering. Having regard to this end they have changed different variables according to the types of car in question but which all have for their object the reduction… | ||
| Scan113 | Technical analysis comparing worm and sector versus worm and nut steering systems in relation to shimmy and wobble suppression. | ||
| View original record | contd :- -16- the reversibility increasing at the same time as the resistance to road shocks diminishes. We think it is a good idea to keep as big a multiplication as compatible with the degree of… | ||
| Scan114 | Analysis of wheel shimmy, covering factors such as toe-in, steering, and spring flexibility. | ||
| View original record | contd :- -17- (2) There is an inevitable tendency with all modern cars with semi-reversible steering to shimmy. (3) There is an increase in steering couple by the employment of low pressure tyres. Toe… | ||
| Scan115 | Analysis of steering shimmy, the role of suspension components, and the effect of shock absorbers. | ||
| View original record | contd :- -18- (1) The extremity of the pendulum lever. (2) The ball joint on the side steering arm. (3) Front spring shackles are in a straight line and occupy such a position that the arc of… | ||
| Scan116 | Technical explanation of static and dynamic wheel balancing. | ||
| View original record | contd :- -19- H. OUT OF BALANCE OF THE WHEELS. There are two sorts of out-of-balance :- (a) Static out of balance which can be easily observed and suppressed. (b) Dynamic out of balance which is more… | ||
| Scan117 | Page discussing the principles of dynamic and static balance, and their effect on wheel shimmy and steering. | ||
| View original record | contd :- -20- m w^2 d1 = P/g w^2 d2 One does not bother about dynamic balance which in this case is not present if the centre of gravity of the masses m and p are located in the same perpendicular… | ||
| Scan118 | Wheel oscillations and balance, specifically investigating the causes of shimmy related to tyre patches. | ||
| View original record | contd :- -21- The diagram that we have taken (see test 18.) shows the regularity of the oscillations. Out of balance of the wheels actually plays an important part in the production of shimmy and it… | ||
| Scan119 | General conclusions on the causes and contributing factors of steering shimmy, with analysis of tyre types and specific car models. | ||
| View original record | contd :- -22- We do not believe that this distortion plays an important part in the production of shimmy. GENERAL CONCLUSIONS. (1) Shimmy affects the steering of numerous late model cars fitted with… | ||
| Scan120 | The causes of wheel wobble, shimmy, and potential methods for elimination. | ||
| View original record | contd :- -23- (3) We have not found a satisfactory explanation of the forces promoting wobbles. The fact that the wobble period is almost always exactly equal to that of a wheel revolution, has made… | ||
| Scan121 | Page of recommendations for designers on how to eliminate steering shimmy and improve vehicle stability. | ||
| View original record | contd :- -24- in the steering. At the critical speed of the car (52 to 55 mph) it is possible to see clearly the independent spring of each wheel take up any position and remain there without moving… | ||
| Scan122 | Appendix page noting the omission of sections on back lash, steering effort, and balloon tyres. | ||
| View original record | APPENDIX. The measurement of back lash and steering effort. This is not of much interest to R-R, so is omitted. The advantage of balloon tyres. Omitted, being only obvious remarks. ************** | ||
| Scan123 | Study of steering torques and wheel play data for various vehicles, primarily Renault models. | ||
| View original record | ETUDE DES COUPLES DE BRAQUAGE [Left Table] Voitures R3 50.519 704 32 28 12.7 15 10 st: 1.00 R6 42.158 635 34 26 13.1 10 8 4.55 LS (baches) 36.831 863 34 26 13.1 13 14 10.00 (rattrapage) 12/13 LM… | ||
| Scan124 | Blank document page with a pink ink stamp from the print room. | ||
| View original record | ROLLS-ROYCE, LIMITED PRINT ROOM, 10 OCT 1925 DERBY. | ||
| Scan125 | Study on the variation of steering torque based on tire type and pressure. | ||
| View original record | ETUDE SUR LE 8 DAY Variation du Couple de Braquage suivant le type de pneu et la pression (Volant de Cm.50) Voiture de | Charge | Câblé | Confort | OBSERVATIONS : Charge : AV | Dimensions : Pression :… | ||
| Scan126 | Specification table in French detailing chassis and wheel (jante) data for various car models. | ||
| View original record | C A B L E | J A N T E S Type de la voiture | Char-ge | Di-mensions | Pres-sion | Ef-fort | Di-mensions | Pres-sion | Ef-fort | OBSERVATIONS 1'AV ERI | 662 | | | | 775/145 | (0.750) 90 | (1.250) 24… | ||
| Scan127 | Blank page with a Print Room date stamp in the bottom right corner. | ||
| View original record | ROLLS-ROYCE, LIMITED PRINT ROOM. 10 OCT 1925 | ||
| Scan128 | Tests conducted to resolve high-speed steering wobbles. | ||
| View original record | R.R. 493A (50 H) (R.D. 31. 12-6-25) J.H.L. EXPERIMENTAL REPORT. Expl. No. 4457 REF HS/R ml/LG9.10.25. To R, from Hs/Rm. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. HIGH SPEED STEERING WOBBLES.… | ||
| Scan129 | Endurance testing of hydraulic devices and side steering tubes to eliminate wobbling. | ||
| View original record | R.R. 498a (30 H) (D.D. 31. 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF. Hs/R ml/LG9.10.25. We are testing these for endurance on the bumping rig, they would appear to be very much more reliable… | ||
| Scan130 | Michelin Tyre Company's investigations into high-speed wobbles and wheel shimmy. | ||
| View original record | R.R. 83a (50 H) (D.D. 31. 12-6-25) J.H. EXPERIMENTAL REPORT. Expl. No. 4457 REF: Hs/Rm/LG10.10.25. To R: from Hs/Rm. c: to DA. c: to BJ. HIGH SPEED WOBBLES. MICHELIN TYRE COMPANY'S INVESTIGATIONS.… | ||
| Scan131 | Tests investigating the causes and potential cures for wheel wobble. | ||
| View original record | R.R. 482A (50 H) (D.D. 31. 12-6-25) J.H.L. EXPERIMENTAL REPORT. -2- Expl. No. REF Hs/Rn/1/LcL.10.25. Their remarks on increasing the width of the track appear to be reasonable. We do not agree with… | ||
| Scan132 | Distributing a report and a French translation regarding high speed steering wobbles. | ||
| View original record | X457 To E. from Hs. To RG. " " To BY. " " To Wor. " " Hs1/LG10.10.25. HIGH SPEED STEERING WOBBLES. We attach copy of Hs/Rm1/LG10.10.25. We have sent copies of the French translation mentioned in this… | ||
| Scan133 | High-speed wobbles, discussing Michelin's investigations into 'wheel shimmy'. | ||
| View original record | EXPERIMENTAL REPORT. Expl. No. REF Hs/RmL/LG10.10.25. To R. from Hs/Rm. c. to DA. c. to BJ. HIGH SPEED WOBBLES. MICHELIN TYPE COMPANY'S INVESTIGATIONS. Last week we received from Mr. Healey of the… | ||
| Scan134 | The causes of vehicle wobble and the ineffectiveness of certain remedies. | ||
| View original record | R.R. 493a (50 M) (D.D. 31, 12-6-25) J.H.L. EXPERIMENTAL REPORT. -2- Expl. No. REF. Hs/Rml/LG10.10.25. Their remarks on increasing the width of the track appear to be reasonable. We do not agree with… | ||
| Scan135 | Scheme showing the distance between the intersection of the pivot pin and the centreline of the tyre. | ||
| View original record | SCHEME SHOWING DISTANCE BETWEEN POINT OF INTERSECTION OF C/L OF PIVOT & PIN, & C/L OF TYRE. MEASURED ALONG C/L OF PIVOT. ROLLS-ROYCE LIMITED PRINT ROOM 12 OCT. 25 DERBY. THIS NUT IS REDUCED TO PREVENT… | ||
| Scan136 | Hand-drawn sketch with annotations for a mechanical test rig. | ||
| View original record | ORIGINAL X457 WHEEL APPROX OF THE SAME DIA AS A CAR WHEEL, MADE OF SOME MATERIAL EASILY MELTED AND USED AGAIN. MR ROYCE SUGGESTED AN ANTIMONY ALLOY BENT FLAT STRIP TWO RADIUS RODS OF FLAT ROD TO… | ||
| Scan137 | Steering wobbles and tyre pressure adjustments for Phantom demonstration cars. | ||
| View original record | 457 PN2/DN14.10.25. TO Hs FROM PN Steering Wobbles. Resulting from our conversation when you were at Conduit Street last, when you informed me that you had been able to decide definitely that steering… | ||
| Scan138 | Test report on high speed wobbles, examining the effect of tyre pressure with and without shock absorbers. | ||
| View original record | 16/1925 4057 HIGH SPEED WOBBLES. 98NK. STANDARD H.P TYRES. No SHOCK ABSORBERS. Tyre Press lbs/□" | PERIOD OF WOBBLE UP M.P.H. | DOWN. M.P.H. 35 | 58-64 | 64-56 40 | 60-63 | 63-58 45 | 65-68<-VIOLENT->… | ||
| Scan139 | Confirming that properly balanced wheels with a tyre pressure of 45 lbs should prevent steering wobbles. | ||
| View original record | To PN. from Hs. X457 Hs6/LG16.10.25. STEERING WOBBLES. PN2/DN14.10.25. We confirm that with properly balanced wheels there should be no risk of wobbles with a tyre pressure of 45 lbs. Hs. | ||
| Scan140 | Response to a customer regarding wheel wobble issues on a non-Phantom car. | ||
| View original record | To Rg. from Hs/Rm. X457 Hs/RmB/LG16.10.25. WHEEL WOBBLE. Y3465 With reference to Mr. Smith's letter attached. We suggest that an answer like the one we attach might meet the case. We should however… | ||
| Scan141 | The causes and cures for low and high-speed wheel wobble. | ||
| View original record | R.R. 493a (50 H) (D.D. 21, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rm2/LG161025 To RG. from Hs./Rm. WHEEL WOBBLE. There are two kinds of wheel shimmy quite separate in cause and cure. A… | ||
| Scan142 | With recommendations to fix low speed wobble and shimmy in steering. | ||
| View original record | EXPERIMENTAL REPORT. -2- Expl. No. REF Hs/Rm2/LG1610 will develop low speed wobble. Carefully check the lean of the pivot and if it is more than 1°, alter it by altering the angle of the wedge to… | ||
| Scan143 | Letter to Dunlop Rubber Co. Ltd. returning a Michelin paper and discussing high-speed steering wobbles. | ||
| View original record | +459 Hs/Rn4/LG. Expl: Dept: 16th. Oct. 1925. A. Healey Esq., The Dunlop Rubber Co.Ltd., Fort Dunlop, Erdington, Birmingham. Dear Sirs, For the attention of M.A.Healey. Research Dept. We are returning… | ||
| Scan144 | Letter from Dunlop Rubber Co. Ltd. regarding a Michelin paper on 'Shimmy' and inquiring about the status of tyre and wheel tests. | ||
| View original record | Telegraphic Address. "DUNLOPS, BIRMINGHAM" Telephone No. BIRMINGHAM CENTRAL 4108. PRIVATE BRANCH EXCHANGE. 25 LINES. Registered Offices. DUNLOP HOUSE, 1, ALBANY ST LONDON. N.W.1. X457 BY APPOINTMENT… | ||
| Scan145 | High-speed wobbles for car 98-NK under different tyre and suspension configurations. | ||
| View original record | R.R. 493A (50x) (D.B. 175 25-9-24) J.H.D. 457 REF. Hs/RB.20.10.25. EXPERIMENTAL REPORT. Expl. No. HIGH SPEED WOBBLES - 98-NK CAR. Very stiff front springs - low geared steering. Standard 33 X 5 high… | ||
| Scan146 | Investigating high-speed steering wobbles by modifying spring leaf configurations. | ||
| View original record | R.R. 498A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. 457 REF: Hs/Rm3/LG231025 To R. from Hs/Rm. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. HIGH SPEED STEERING WOBBLES.… | ||
| Scan147 | High-speed wobbles caused by low pressure balloon tyres on New Phantom cars. | ||
| View original record | R.R. 493a (50 H) (D.D. 31. 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. 4457 REF: Hs1/LG26.10.25. To B.J. from Hs. BALLOON TYRES - HIGH SPEED WOBBLES. 44565 4457 We cannot agree to the fitting of… | ||
| Scan148 | The effect of high and low pressure tyres on wheel wobble. | ||
| View original record | H.R. 493a 150 H) (D.D. 31. 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF Hs1/L026.10.25. deflected. In other words, the balloon tyre absorbs very little energy when tramping is taking place,… | ||
| Scan149 | Letter to The Dunlop Rubber Co. discussing practical difficulties with a steering device suggestion, referencing Ackermann geometry. | ||
| View original record | X457 Hs/Rml/LG. Expl: Dept: 27th. Oct. 1925. Messrs. The Dunlop Rubber Co., Fort Dunlop, Erdington, Birmingham. Dear Sirs, For the attention of Mr. Healey. Research Department. With reference to your… | ||
| Scan150 | Wheel wobble on Chassis No. 931. | ||
| View original record | Hs/Rm. XC457 Rg8/W29.10.25 WHEEL WOBBLE. With reference to Hs/Rm3/LG16.10.25, please note that Mr. Smith's car is an old one, Chassis No.931. Rg. Rg. | ||
| Scan151 | The testing of Dunlop high-pressure tyres, discussing mileage, pressures, and effects on steering for the Phantom and 20 HP models. | ||
| View original record | R.R. 493A (50 H) (D.D. 31. 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. 4457 REFis/Rm2/LG31.10.25. To BJ. From Hs/Rm. c. to FN. c. to CWB. TYRES. X3538 With reference to BJ2/H30.10.25 attaching copy… | ||
| Scan152 | Steering tests carried out on chassis 93-NK at various tyre pressures. | ||
| View original record | R.R. 493a (50 H) (D.D. 31. 12-6-25) J.H.D. EXPERIMENTAL REPORT. COPY. Expl. No. REF: GWH/Gms.7.25. To Hs. From G.W.Hancock. RE. CHASSIS 93-NK. Steering tests carried out on 93-NK. Front tyres… | ||
| Scan153 | Letter from the American branch to the British branch regarding a hydraulic steering system. | ||
| View original record | ROLLS-ROYCE OF AMERICA, INC. SPRINGFIELD, MASS. X457 Oy14-E-111125 November 11, 1925. Mr. E. W. Hives, Rolls-Royce, Ltd., Derby, England. Dear Mr. Hives: Re Steering I want to draw your attention to… | ||
| Scan154 | The necessity of balancing Silver Ghost wheels to prevent steering wobble. | ||
| View original record | EXPERIMENTAL REPORT. Expl. No. +457 REF Hs2/LG12.11.25 To FN. from Hs. c. to H. c. to BJ. BALANCE OF SILVER GHOST WHEELS. 7401 +457 As a matter of interest, we are sending you copies of reports… | ||
| Scan155 | Cause of steering wobbles, attributing it to the imbalance of tyres and inner tubes. | ||
| View original record | COPY. Sept 7th.1911. To Mr. Wormald. RE. STEERING WOBBLES. When Mr. Hanbury was here on Monday he made some interesting statements in regard to steering wobbles and consequently have made some careful… | ||
| Scan156 | Committee discussion regarding steering wobbles caused by out-of-balance tyres. | ||
| View original record | COPY. RE: STEERING WOBBLES. Nov. 15th. 1911. Mr. Nadin informed the Committee that he had written to 'S' asking for a reply to our letter asking whether we should be correct in returning to the makers… | ||
| Scan157 | Minutes of the 93rd Steering Committee meeting discussing the balancing of tyres with Dunlop, Michelin, and Continental. | ||
| View original record | Dec.4th, 1911. --------------- STEERING. 93rd. Meeting. Re: balance of tyres. Mr. Nadin submitted a letter from the Dunlop Tyre Co. dated Dec. 22nd. concerning the balance of tyres. The gist of their… | ||
| Scan158 | Customer's feedback on wheel balancing issues and a suggested solution. | ||
| View original record | COPY. To Mr. Johnson. Mr. L.F.Gjers of Middlesborough who has four 40/50 HP. Rolls-Royce cars, who called in the other day, while waiting for his wife, to have a chat with me as he often does,… | ||
| Scan159 | Steering wobble on a 15-MC Cabriolet Demonstration Car. | ||
| View original record | To R. from B.J. Copy to Hs. By X457 BJ2/H12.11.25. 15-MC - Cabriolet Demonstration Car. Steering Wobble. I attach a copy of PN6/DN10.11.25, with regard to steering wobbles and balancing wheels, for… | ||
| Scan160 | Steering wobble issue in a 15-MC Cabriolet 'Phantom' during a demonstration. | ||
| View original record | COPY OF PN6/DN10.11.25. To BJ. From PN. c. to H. and Bt. 15-MC - Cabriolet 'Phantom' Demonstration. Steering Wobble. This car was used by Bt. yesterday in connection with his work, and it appears that… | ||
| Scan161 | New front axle design for the Phantom to reduce steering wobbles. | ||
| View original record | To BY. from R. c. to CJ. BJ. Hs. X457 R3/M16.11.25. RE. PHANTOM FRONT AXLE. (STEERING WOBBLES) X.235 X.457 X.8420 X.8430 DA. is sending a drawing of a new complete front axle, of a design we have made… | ||
| Scan162 | Correspondence regarding wheel wobble on an ancient 40/50 car, attaching an extract from a letter on the subject. | ||
| View original record | R. Mr. WJ. A.F.S. C. Her. C. Hs. X457 Rg2/W17. 11. 25 WHEEL WOBBLE. I have had some correspondence regarding the above, with Col. Smith, the owner of an ancient 40/50 car. I attach hereto copy of his… | ||
| Scan163 | Letter discussing the need for a hydraulic damping device to control steering wheel wobble. | ||
| View original record | COPY. Isomer, Mapledurham, Oxon. 13.11.25. Rg7/W. Dear Mr.Rowledge, I thank you for your letter of the 29th. ult. I had hoped to have seen you, either at the I.A.E.dinner or Council meeting, to have… | ||
| Scan164 | Letter from The Wilson Engineering Works discussing their device to control front wheel wobble. | ||
| View original record | COPY of Extract. David J. Smith, Esq. The Wilson Engineering Works. Mapledurham. The writer read with great interest that part of your letter dealing with the subject of front wheel wobble. This,… | ||
| Scan165 | Steering issues, tyre pressures, and proposed improvements to axle and damper systems. | ||
| View original record | To HS. from R. To BY. from R. c. to CJ. BJ. PN. +457 R6/M:8.11.25. STEERING - TYRE PRESSURES. X.3538 X.5830 X.8430 X.457 I notice in France they have come to the same conclusion as myself, namely,… | ||
| Scan166 | Tests conducted to understand and mitigate high-speed steering wobbles. | ||
| View original record | R.R. 498A (50 H) (D.D. 31. 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. +457 REF: Rm1/LGS.12.25. to R. from Hs/Rm. c. to CJ. BJ. c. to RG. E. c. to DA. EY. c. to Wor. HIGH SPEED STEERING WOBBLES.… | ||
| Scan167 | Tests investigating steering wobble, wheel dishing, and king pin friction. | ||
| View original record | -2- Hs/Ral/LGS.12.25. Under these circumstances we could obtain no shimmy at any speed. The steering was definitely heavier with the wheels dished out, so we carried out a test to determine if the… | ||
| Scan168 | Wheel balancing, out-of-balance issues, and steering wobble. | ||
| View original record | EXPERIMENTAL REPORT. To PN. from Hs. c. to BJ. c. to CWB. c. to EP. Expl. No. +457 REF. Hs1/LG9.12.25. WHEEL BALANCING. +401 PN5/DN1.12.25. On several cars we have tried, the amount of out of balance… | ||
| Scan169 | High-speed steering wobbles and the design of a new axle to mitigate the issue. | ||
| View original record | To HS. from DA. DA2/M11.12.25. HIGH SPEED STEERING WOBBLES. X.457 X.8420 X.8430 With reference to Hs/Rml/LGS.12.25., it will of course have occurred to you that the effect of arranging the axle to… | ||
| Scan170 | Steering wobbles, experimental reports, and the effect of springing and 4-wheel brakes. | ||
| View original record | To WOR, from Hs. X457 HsB/LG25.1.26. STEERING WOBBLES. With reference to the letter from Mr. Nadin dated Jan. 2nd. 1926 which we attach herewith. We will send to Springfield for the attention of NA.… | ||
| Scan171 | The impact of modified brakes and stiffer springs on the car's riding qualities and unsprung weight. | ||
| View original record | contd :- -2- and the springs modified. We have not heard of a single case of a customer complaining of any deterioration in the riding qualities of the car after the brakes had been fitted. We are… | ||
| Scan172 | Suggesting a gearing change for an inertia damper to better counteract high-speed steering wobble. | ||
| View original record | To BY. from Hs/Rn. X457 Hs/Rm1/LG26.1.26. INERTIA DAMPER. ✓8520 With reference to the inertia damper for high speed steering wobbles. We find that when we are experiencing a wobble of the maximum… | ||
| Scan173 | The rear springing and tyre performance of the 7-EX car at Le Canadel, with recommendations for improvements. | ||
| View original record | Hs. To EY. } FROM R. DA. } LE CANADEL. c. to CJ. BJ. RG. X457 RL/AM. 2.26. RE. REAR SPRINGING - TYRES. X.8410 X.457 X.8992 X.8820 X.4117 X.235 7-EX RRs CAR AT LE CANADEL. I find the springing on this… | ||
| Scan174 | Investigation into high-speed steering wobbles, detailing findings and seeking information on how the problem is handled in the USA. | ||
| View original record | To Na. } FROM Hs. To OY. } c. to WOR. X 457 Hs2/LG6. 2.26. RE. HIGH SPEED STEERING WOBBLES. We attach herewith some of the experimental reports in connection with the above phenomenon. The facts… | ||
| Scan175 | Tests of new hydraulic shock absorbers to eliminate high-speed steering wobbles. | ||
| View original record | Expl: Report: Expl: No. X457 Ref. Hs/RmS/LG9.2.26. To R. from Hs/Rn. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to OY. Wor. R-R HYDRAULIC SHOCK ABSORBERS. We have carried out a series of tests to… | ||
| Scan176 | Tests conducted on tyres and dampers to eliminate wheel wobble. | ||
| View original record | contd :- -2- hydraulic dampers would cope with the wobbles set up by these tyres. We then tried 7.25" tyres at 20 lbs/sq.in: We found that we were unable to eliminate the wobbles produced by these… | ||
| Scan177 | The phenomenon of high-speed steering wobbles or 'shimmy' in cars. | ||
| View original record | Expl: Report. Expl.No. 457 4457 3809 Ref. Hs/Rm2/LG9. 2. 26. To R. from Hs/Rm. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. HIGH SPEED WOBBLES. We believe that the extent of the variations… | ||
| Scan178 | Car 'shimmy' and 'wobble' issues, particularly in relation to new well base tyres. | ||
| View original record | contd :- -2- when passing a verdict on any alteration liable to affect 'shimmy'. While we have not the slightest doubt that it is possible for a car to be fitted with the new well base tyre at 35… | ||
| Scan179 | Letter to Mr. E. W. Hives concerning experimental work and theories on front wheel wobble. | ||
| View original record | ROLLS-ROYCE OF AMERICA, INC. SPRINGFIELD, MASS. Y457 Oy2-E-21026 R E J A J R G E R D a B y W O R February 10, 1926. Mr. E. W. Hives, Mickleover, Near Derby, England. (Personal) Re Front wheel wobble… | ||
| Scan180 | Letter discussing front wheel wobble, gyroscopic effects, and the impact of reducing toe-in. | ||
| View original record | Oy2-E-21026 -2- February 10, 1926. This "precesses" the gyroscope and gives the necessary alternate impulses to the system to increase both the tramping effect and the accompanying wobble. Whatever… | ||
| Scan181 | Cause and potential solutions for steering wobble on Mr. Salamanca's car. | ||
| View original record | To CJ. from Hs. 4457 HS4/LG12.2.26. 4457 78430 STEERING WOBBLES ON MR. SALAMANCA'S CAR. We think it is probable that Mr. Salamanca would re-gain confidence in the steering on his car if a new type… | ||
| Scan182 | Typed note discussing the causes of 'wobble' in Phantom and Silver Ghost cars. | ||
| View original record | contd :- -2- can be tried on which wobbles do not occur. In the same way, there are a large number of RR. cars running which have never experienceda wobble: The only reason why the Phantom car is… | ||
| Scan183 | Concerning steering wobble issues on a customer's car. | ||
| View original record | Y457 To Hs. from CJ. Steering Wobbles on Sa's car. CJ1/E15/2/2/26 With reference to your memo. Hs4/LG12/2/26 concerning steering wobbles on Sa's car, is de Salamanca aware of what the difference is… | ||
| Scan184 | Fractured links and worn link holes in hydraulic shock absorbers. | ||
| View original record | Expl: Report. Expl: No. X457 Ref. Hs/RMS/1/L17.2.26. To R. From Hs/Rm. c. to CJ. BJ. c. to RG. E. c. to WY. DA. c. to Wor. HYDRAULIC SHOCK ABSORBERS. X235 [Blueprint Image Labels] FRACTURED LINKS.… | ||
| Scan185 | Steering wobble issues and recent steering improvements on the Phantom model. | ||
| View original record | To Sa. from Hs. c. to CJ. +457 Hs3/LG17.2.26. STEERING WOBBLES. X457 X235 CJ. has passed on to us a letter in which you point out the faults with the steering fitted to your Phantom car. During the… | ||
| Scan186 | High-speed steering wobbles, tyre pressures, and the potential of hydraulic dampers. | ||
| View original record | contd :- -2- We have a Hispano car and on this we can produce high speed wobbles. We have recently tried a new Cadallic car which developed the high speed steering wobble during the trial run. We know… | ||
| Scan187 | Letter discussing the causes of high-speed steering wobble and the improvements being made. | ||
| View original record | contd :- -3- about to build up, leads us to believe that what you may be feeling is road shocks which are transmitted to the steering wheel. It is not necessary to travel over a rough road to produce… | ||
| Scan188 | The benefits and design considerations of hydraulic shock dampers, including tyre pressure and a relief valve modification. | ||
| View original record | Hs To DA. } FROM R. BY. Le CANADEL. c. to CJ. BJ. Wor. c. to RG. E. PN. CWB. 457 R2/M19.2.26. RR. HYDRAULIC X.235 SHOCK DAMPERS. X.8520 X.457 I have already written to press these forward for both… | ||
| Scan189 | Comparative tests of a new non-skid tyre, which demonstrated increased high-speed steering wobbles. | ||
| View original record | File 4457 Hs/Rm2/LG20.2.26. HIGH SPEED STEERING WOBBLES. 43809 Careful comparative tests of the high pressure well base rim and tyre with the new non-skid tread demonstrate that this tyre is… | ||
| Scan190 | Tests to determine the minimum loading for hydraulic shock dampers to eliminate high-speed steering wobbles. | ||
| View original record | 457 Expl: Report! Expl: No. Ref. Hs/Rm3/LG20. 2. 28. To R. From Hs/Ra. c. to CJ. HJ. c. to RO. E. c. to DA. SY. c. to OY. Wor. HYDRAULIC SHOCK DAMPERS. X235 X457 We carried out tests to ascertain what… | ||
| Scan191 | Investigation into the causes and effects of front wheel wobble. | ||
| View original record | To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wox. +457 Hs2/LG22. 2.26. RE. FRONT WHEEL WOBBLE. +4565 With reference to the attached note from OY. on wheel wobble. We have investigated… | ||
| Scan192 | Observations and potential solutions for front wheel wobble on cars with front brakes. | ||
| View original record | C O P Y. To Hs. from OY. RE. FRONT WHEEL WOBBLE. Mr. John Warren Watson of the "Stabilator" Co. mentioned some interesting points in experimental work he is doing in connection with wheel wobble on… | ||
| Scan193 | Risk of high-speed steering wobbles associated with low-pressure tyres. | ||
| View original record | X457 HS To R. from CJ. Copy to BY. Copy to Hs. Low Pressure Tyres & Steering Wobbles. I am delighted to see that you are pressing for the hydraulic shock dampers, but I am rather alarmed to find that… | ||
| Scan194 | Letter from the Spanish representative regarding a steering wobble and a replacement part for trial. | ||
| View original record | La conducción de personas y coches por mi personal es a riesgo del cliente o solicitante, ya se trate de una prueba oficial, ya por cualquier otro concepto, declinando la Casa C. de Salamanca toda… | ||
| Scan195 | Letter discussing the phenomenon of high-speed wobble, potential solutions, and American front brake practices. | ||
| View original record | ROLLS-ROYCE OF AMERICA, INC. SPRINGFIELD, MASS. X457 Oy6-E-22326 February 23, 1926. Mr. E. W. Hives, Mickleover, near Derby, England. (Personal) Re High Speed Wobbles Dear Hives: Many thanks for your… | ||
| Scan196 | High-speed wobble, comparing to American cars and proposing hydraulic steering gear solutions. | ||
| View original record | Oy6-E-22326 -2- February 23, 1926. Remember that no American car uses any form of servo system, so that their increase in braking is very "mild", and, with the increase in operating friction, the… | ||
| Scan197 | Technical memorandum discussing wheel swing, tire tread effects, and potential steering system improvements. | ||
| View original record | Oy6-E-22326 -3- February 23, 1926. you do not attempt to explain why it goes on swinging outwards. It seems to me the explanation is the same as that of the improvement affected by flat tire treads.… | ||
| Scan198 | Wheel wobble, steering effects, and potential improvements using Lovejoy and criss-cross shock absorbers. | ||
| View original record | Oy6-E-22326 -4- February 23, 1926. The effect of this would be that each wheel would be pretty well left to itself in going straight ahead, but they would move together in steering, each wheel setting… | ||
| Scan199 | Hydraulic shock damper failure, potential design improvements, and terminology. | ||
| View original record | DA. To HS/Rm. } FROM R. BY. c. to CJ. BJ. E. +457 R3/M25.2.26. HYDRAULIC SHOCK DAMPER. X.457 X.235 The failure of the link is not serious. It is possibly due to fracture in rivetting, and could easily… | ||
| Scan200 | The effectiveness of hydraulic shock dampers and plans for testing and implementation. | ||
| View original record | To DA. BY. Hs. } FROM R. LE CANADEL. c. to CJ. BJ. Wor. E. RG. +457 R2/M26.2.26. HYDRAULIC SHOCK DAMPERS. X.235 X.457 X.4565 It is indeed good news that the above are so effective to reduce high speed… | ||
| Scan201 | Pressing for the adoption of hydraulic shock dampers, semi-balloon tyres, and a lighter front axle for Phantom & Coshank models. | ||
| View original record | To Hs. } FROM R. BY. } LE CANADEL. DA. } c. to CJ. BJ. Wor. x457 R1/M27.2.26. RE. PHANTOM & COSHANK LOW PRESSURE TYRES. X.4565 X.5420 x457 X.235 X.8420 I am pressing for the adpption of the… | ||
| Scan202 | Effects of hydraulic shock absorbers on vehicle springing and steering wobble. | ||
| View original record | To R. From Hs. c. to CJ. c. to RG. E. c. to DA. BY. c. to Cy. Wor. X457 Hs7/LG3.3.26. HYDRAULIC SHOCK ABSORBERS. 1235 Although we have made no remarks on the effect of these shock absorbers on the… | ||
| Scan203 | The effects of axle design, front wheel brakes, and tyres on steering wobble and road shocks. | ||
| View original record | contd :- -2- of the axle without it getting into a period. This is supported by the fact that whenever we have increased the tendency to wobble we have increased the road shocks felt on the steering… | ||
| Scan204 | Cover memo regarding high speed wobbles, attaching a report and blueprints. | ||
| View original record | COPY X45J To R. from BJ. c. to EWT (for Works Committee) BJ/Py20/D8.3.26 Re: High speed wobbles We attach hereto copy of Oyl-E-22526 dated the 25th February, regarding the above, together with the… | ||
| Scan205 | Letter from America to Mr. F.H. Royce concerning high-speed wobbles, gyroscopic couple and tire design. | ||
| View original record | COPY. ROLLS-ROYCE OF AMERICA, INC. SPRINGFIELD, MASS. Cyl-M-22-26. February 28, 1926. Mr. Claude Johnson, Rolls-Royce, Ltd., London, England. (Copy for attention of Mr. F.H. Royce). Dear Sir: Re: High… | ||
| Scan206 | Page with a purple ink stamp from the Print Room, Derby. | ||
| View original record | ROLLS-ROYCE LIMITED. PRINT ROOM 10 MAR 1936 DERBY. | ||
| Scan207 | Customer complaints of low speed wobbles on 20 HP cars fitted with 4-wheel brakes. | ||
| View original record | To DA. from Hs. 4457 Hs4/LG19.3.26. LOW SPEED WOBBLES ON 20 HP. X5430 We are getting several complaints from customers of low speed wobbles on 20 HP. cars fitted with 4-wheel brakes. These cars have… | ||
| Scan208 | Resolving low speed wobbles on a 20 HP car, including a proposed fix using friction washers. | ||
| View original record | contd :- -2- are going to do with the customer who complains of low speed wobbles. It has been suggested that we tell him he is fortunate, he might have had high speed wobbles. We attach herewith a… | ||
| Scan209 | Low-speed steering wobble issue on the 20 HP chassis. | ||
| View original record | X457 Ho OWB2/DN20.3.26. TO EP c. to DJ, H of. & Hs FROM OWB 20 HP Low Speed Steering Wobble. We have been aware from the earliest times that a low speed steering wobble could be set up on the India… | ||
| Scan210 | Investigation into low-speed steering wobbles on the 20-HP model. | ||
| View original record | W/S c. GWB. c. Wor. c. HS. c. BI. Xu57 EP9/H22.3.26. re. 20-HP. Low Speed Steering Wobbles. With reference to your memo CWB2/DN20.3.26. This matter has already been thoroughly gone into. I have… | ||
| Scan211 | Solutions for low-speed wobbles on the 20 HP model. | ||
| View original record | To Hs. from DA. X457 DA2/M23.3.26. LOW SPEED WOBBLES ON 20 HP. X.457 X.5430 X.5420 Replying to your Hs4/LG9.3.26. R. has refused to consider several times a device in the steering pivot equivalent to… | ||
| Scan212 | Experimental tyre tests concerning high-speed wobbles, comfort, noise, and skidding. | ||
| View original record | To G.J. from Hs. c. to B.J. x457 Hs1/LG25.3.26 X1583 x457 X4565 Referring to the telephone message which we have received from you today. From experimental tests, the oversize medium tyres on the… | ||
| Scan213 | Low-pressure tyre performance on the Phantom model, suspension issues, and a separate note on oil alternatives. | ||
| View original record | contd :- -2- conjunction with DA. Hdy! CWB. EP. have proved that the fitting of low pressure tyres does not overcome the particular complaint which we are at present investigating on the Phantom. This… | ||
| Scan214 | Comparison of Prices and Wakefields oils, discussing composition, availability, and suitability for standardisation. | ||
| View original record | contd :- -3- standardisation sheet, we are sending it on to you and BJ. for signature. The difference between Prices and Wakefields oil is that Prices contains a 10% mixture of sperm and lard oil, and… | ||
| Scan215 | Solutions for steering wobble and vibration issues on 20-HP and 40/50 HP cars. | ||
| View original record | Hs. BY. Wor. CWB. X457 EP11/H25.3.26. re. STEERING. 20-HP. and 40/50 HP. With reference to your promise to CWB. that new type Friction Scheme should be used to deal with complaints of the low speed… | ||
| Scan216 | Reports of low-speed steering wobbles in 20-HP cars and issuing instructions for rectification. | ||
| View original record | ~~BY.~~ Hs. ~~Wor.~~ for Mx. X457 EP6/H25.3.26. re. 20-HP. Low Speed Steering Wobbles I am attaching herewith copies of reports from Br. in regard to the above. of three cars he has dealt with, i.e.… | ||
| Scan217 | Fix for low-speed steering wobbles on the 20 HP model. | ||
| View original record | Jds. X457 CWB6/DN25.3.26. TO BJ c. to EP & Hs FROM CWB 20 HP Low Speed Steering Wobbles. I discussed this matter with Hs. and EP and Da. at "W" on the 24th March. It was stated by Hs that this… | ||
| Scan218 | Steering adjustments and solutions for low speed wobbles on 20 HP and 40/50 HP models. | ||
| View original record | To EP. from Hs. c. to BY. c. to Wor. c. to CWB. 7457 Hs2/LG26.3.26. STEERING 20 HP. and 40/50 HP. X.5430 X.8430 X.457. Referring to EP11/H25.3.26. BY. has agreed that he will issue instructions so… | ||
| Scan219 | Customer complaints of low-speed steering wobble on 20 HP models and proposed solutions. | ||
| View original record | To R. From Hs. c. to CJ. BJ. c. to BG. Z. c. to DA. BY. c. to OY. Wor. X457 HsS/L.29.3.26. LOW SPEED STEERING WOBBLES. X5430 X457 We have had several customers complain of low speed wobbles on the 20… | ||
| Scan220 | Authorising the production of 12 new friction devices to fix low-speed steering wobble on customer cars. | ||
| View original record | BY. Hs. EWT. X457 EP6/H1.4.26. re. Low Speed Steering Wobble. CJ. has given his approval for 12 sets of new Friction Device to the pivots, referred to in Hs2/LG26.3.26. to be made up for use on cars… | ||
| Scan221 | High-speed steering wobbles experienced on car 7-EX with medium pressure tyres. | ||
| View original record | To Hs. & DA. from R. at Le Canadel. c. to CJ. BJ. 457 R2/M2.4.26. RE. HIGH SPEED STEERING WOBBLES. X.457 X.235 7-EX MEDIUM PRESSURE TYRES. X.4565 X.8820 On car 7-EX we find we get these at the… | ||
| Scan222 | Concerning a low-speed steering wobble on a Phantom model car. | ||
| View original record | X457 HS from EP 44 PK This car last week end. on one or two occasions built up low speed steering wobble. Is this considered part of the programme of standard Phantom or is there something different… | ||
| Scan223 | Steering wobble and vibration issues on car 7-EX and potential solutions. | ||
| View original record | To Hs. from R. c. to BJ. Wor. c. to RG. BY. x457 R5/M18.5.26. RE. 7-EX ETC. X.8770 X.8430 X.235 X.457 (1) With reference to 7-EX, this car would be a suitable one to fit up with hydraulic shock… | ||
| Scan224 | Implementation of spring-loaded ball joints for India steering connections to prevent wobbles. | ||
| View original record | 4457 To EY. from DA. c. to BJ. Hs. DA2/M28.5.26. INDIA STEERING CONNECTIONS. X.5425 X.5450 X.8425 X.457 We send herewith Ns.ch.2201 shewing the spring loaded ball joint for the India cross steering… | ||
| Scan225 | Improvements and tests on the Phantom model's tyres and steering system. | ||
| View original record | To BJ. } FROM R. Hs. } c. to Wor. RG. CWB. c. to BY. PN. OY. Mr. Fuller. X457 R2/M29.5.26. PHANTOMS - MEDIUM PRESSURE TYRES AND STEERING. X.457 X.8820 X.8430 X.8450 (1) Providing the hydraulic dampers… | ||
| Scan226 | Necessity and drawbacks of extra friction on front axle pivots to prevent steering wobble. | ||
| View original record | TO HS. FROM R. X457 R3/M31.5.26. re. FRICTION ON FRONT AXLE PIVOTS - N.SCH.2200. - X.8420. I dislike immensely the extra friction on the front axle pivots as we have been forced to arrange it on… | ||
| Scan227 | Further improvements and design modifications for hydraulic shock dampers. | ||
| View original record | x457 TO HS. FROM R. R14/M10.6.26. Copy to -BJ. " WOR. " BY. " DA. RR. PATTERN HYDRAULIC SHOCK DAMPERS - (FURTHER IMPROVEMENTS) -X.235. It will be realised that these should never be fitted single… | ||
| Scan228 | Problem of high-speed wobbles and the benefits of hydraulic shock dampers over friction types. | ||
| View original record | To BJ. from Hs. +457 Hs1/LG15.6.26. HYDRAULIC SHOCK DAMPERS. X235 Answering your BJ3/E14.6.26. We had a case of high speed wobbles occurring on a car in customers hands on one of the original 20 HP.… | ||
| Scan229 | Report discussing the benefits of hydraulic dampers on 20 HP cars for improving ride comfort and spring longevity. | ||
| View original record | contd :- -2- With the hydraulic dampers, once the setting has been made, there is no reason why it should alter. R. in his R3/M24.7.25 said :- "Many of the 20 HP. cars have given me a very… | ||
| Scan230 | The communication and process for addressing reports of 'front wheel wobbles' on new cars. | ||
| View original record | HS X457 To BY from BJ. Copy to Wor. Copy to Hs. Front Wheel Wobbles. You were mentioning on Tuesday evening that Works officials had repeatedly reported front wheel wobbles but no notice had been… | ||
| Scan231 | Solutions for high-speed steering wobbles on chassis 79-LC during trials. | ||
| View original record | To Hm. from Hs/Rn. +457 Hs/Rml/LG5.7.26. CHASSIS 79-LC - SCHMIDT'S TRIALS. +4117 With reference to Sg/Mac8/HW1.7.26 attached. We do not consider that the alterations made to this chassis will overcome… | ||
| Scan232 | Forwarding a request from The Cambridge Instrument Co. | ||
| View original record | To R. from Hs/Rn. +457 +4630 We have received the attached request from The Cambridge Instrument Co. We are forwarding some information in case you should think it expedient to give them what they… | ||
| Scan233 | Letter from Cambridge Instrument Co. Ltd. requesting to use records taken with a Laboratory Chronograph for a promotional leaflet. | ||
| View original record | CAMBRIDGE INSTRUMENT CO. LTD., 45, GROSVENOR PLACE, LONDON S.W.1. July 19th. 1926. Messrs. Rolls-Royce Ltd., Expl: Dept: Nightingale Rd., Derby. Dear Sirs, We are preparing a descriptive leaflet… | ||
| Scan234 | Method for measuring high-speed steering wobbles using a chronograph and electrical contacts. | ||
| View original record | To R, from Hs/Rm. THE MEASUREMENT OF HIGH SPEED STEERING WOBBLES BY MEANS OF THE CHRONOGRAPH. High speed steering wobbles are a typical instance of a case where the chronograph can be used… | ||
| Scan235 | The adaptation of a 3-pen chronograph for the measurement of braking performance. | ||
| View original record | Contd. -2- Hs/RmL/T22.7.26. Adaptation of the 3-Pen Chronograph to the Measurement of Braking Performance. The adaptation of the three-pen chronograph for making braking tests entirely eliminates all… | ||
| Scan236 | Continued page discussing the calculation of car speed and retardation from braking test records. | ||
| View original record | Hs/RnL/T22.7.26. -3- Contd. The number of wheel revs. in the second before braking, which can be read off on the record, gives the car speed in m.p.h. The car speed in m.p.h. being accurately known… | ||
| Scan237 | Comparison of road shock and ride comfort between standard high-pressure tyres and 6.75' Dunlop balloon tyres. | ||
| View original record | 4457 Hs. from Rm. Hs/Rm4/LG18. 8. 26. ROAD SHOCKS AND TYRE SIZE. X 4050 As a result of the numerous opportunities of comparison which we have been able to make between the standard tyres and the 6.75"… | ||
| Scan238 | High-speed steering wobbles, comparing 6' and 6.75' tyres and the effect of wheel inertia. | ||
| View original record | To R. from Hs/Rm. c. to BJ. Wor. c. to E. Da. c. to Ey. OY. x457 Hs/Rm5/T23.8.26. HIGH SPEED STEERING WOBBLES. With reference to the 6.75" tyres having a greater tendency to promote high speed wobbles… | ||
| Scan239 | Recommending the adoption of low-pressure tyres to keep pace with competitors like Bentley, Daimler and Panhard. | ||
| View original record | To FN. from Hs. c. to BJ. COPY. X457 Hs4/LG31.8.26. LARGE SECTION TYRES. X4565 You will see by our memo. Hs3/LG31.8.26 we are recommending the use of low pressure tyres. We should therefore like to… | ||
| Scan240 | Preliminary steering tests for the 12-EX car, focusing on damper settings and wobble reduction. | ||
| View original record | To R. from Hs/Rm. c. to BJ. Wor. c. to E. Da. c. to BY. +457 Hs/RmL/LGL.9.26. 12-EX CAR - STEERING TESTS. X7430 X4565 Below are preliminary tests received from Hs/Rm. in France on the steering of… | ||
| Scan241 | Tyre performance, steering wobble, and the effect of tyre pressure on selectiveness. | ||
| View original record | contd :- -2- noted that though we have some 6.75" tyres worn to the canvas and very uneven, they will not wobble even with no dampers. Another point of interest is that unless we add a lot of friction… | ||
| Scan242 | Technical report discussing vehicle suspension issues, including insufficient damping and damper design. | ||
| View original record | contd :- -3- wheel increase. Possibly it is the effect they have on the main pivot lean as 1° on the rear = 3/4° pivot lean approximately. We are more or less convinced that a large proportion of the… | ||
| Scan243 | Safety implications and reputational risk of wheel wobble caused by larger, lower-pressure tyres at high speeds. | ||
| View original record | To Hs. from BJ. (COPY) c. to R. c. to Wor. c. to EV. c. to PN. c. to CWB. LARGE SECTION TYRES. I think we are all in accord that the sooner we can adopt a larger tyre and lower pressure than we are… | ||
| Scan244 | Testing of larger section low-pressure tyres on a standard chassis. | ||
| View original record | Contd. -2- BJ5/D2.9.26. In another memorandum you have suggested that this car should be fitted with larger section, low pressure tyres. We think this would be very advantageous and immediately PN.… | ||
| Scan245 | That tests for front wheel wobble should be conducted using well-worn tyres. | ||
| View original record | To PN from BJ. Copy to CWB. Copy to Hs. Front Wheel Wobble. There seems a possibility that tyres which have been in use for some time are more inclined to create front wheel wobbles than new tyres.… | ||
| Scan246 | Performance of 6.75 inch Dunlop balloon tyres compared to 6.00 inch tyres, detailing test results and handling characteristics. | ||
| View original record | X457 To BJ. From Hs. Hs2/LG9.9.26. 6.75" BALLOON TYRES. X4565/X7430 see x7430 for reports. With reference to the attached reports. Up to that dated 16.8.26, the car was run with the 6.00" Dunlop… | ||
| Scan247 | Expressing disappointment over repetitive testing being conducted on the same cars on Continental roads. | ||
| View original record | contd :- -2- Continental roads. We consider it is a pity that both PN. and CWB. are simply repeating the tests on the same cars as we have already tested. In our opinion it would have been a very much… | ||
| Scan248 | Results of testing three different tyre sizes to understand their effect on high-speed wobble. | ||
| View original record | To R. from Hs/Rm. c. to BJ. Wor. c. to RG. E. c. to DA. BY. X457 Hs/Rm1/LG10.9.26. HIGH SPEED WOBBLES. X457 X4050 X4565 With reference to our Hs/Rm5/T23.8.26. in connection with peripheral weight… | ||
| Scan249 | Visit to Dunlop in Birmingham to discuss tyre development, including modifications to triple stud and balloon tyres. | ||
| View original record | x457 Hs/Rm/LG14.9.26. x4050 x4565 DUNLOP TYRES. During a recent visit to the Dunlop Co. Birmingham, we discussed a number of points with Mr. Paull, their axtativ developement superintendent. TRIPLE… | ||
| Scan250 | Discussion with Dunlop regarding the performance of triple stud and traction tread tyres, focusing on wear, wobbling, and safety. | ||
| View original record | contd :- -2- comfort than the standard straight sided tyre we had been running them at reduced pressures. However, we do not believe that this accounts for their wobbling tendencies. The Dunlop Co.… | ||
| Scan251 | Letter to Dunlop Rubber Co. Ltd. regarding high-speed wobbles and 'shimmy' issues with various tyre treads on the 40/50 HP chassis. | ||
| View original record | c. to BY. 4457 Expl: Dept: Hs/Rm3/LG. 15th. Sept. 1926. - Paull Esq., The Dunlop Rubber Co. Ltd., Fort Dunlop, Erdington, Birmingham. Dear Sir, From a recent conversation which our Mr. Bailey had with… | ||
| Scan252 | Letter to Dunlop Rubber Company regarding tyre tread design and its effect on high-speed wobble for the 40/50 HP chassis. | ||
| View original record | COPY. TO HS. 4457 c. Mailing Dept. BY1/H. 16.9.26. September 16th, 1926. Thursday. [Handwritten note: 3-0 17/9/26] The Dunlop Rubber Company Ltd. For the attention of Colonel Matthew, Fort Dunlop,… | ||
| Scan253 | Letter to the Dunlop Rubber Co. regarding testing of tyre treads and issues with 'shimmy' and high-speed wobbles. | ||
| View original record | 4457 Expl: Dept: Hs/An2/LG. 17th. Sept. 1926. The Dunlop Rubber Co., Fort Dunlop, Erdington, Birmingham. Dear Sirs, For the attention of Mr. Paull. Development Superintendent. With reference to yours… | ||
| Scan254 | Steering stability issues related to friction in pivots following tests on the 20 HP and New Phantom axles. | ||
| View original record | To R. from Hs/Rm. c. to BJ. Wor. c. to RG. E. c. to EY. DA. +457 Hs/Rm2/LG20.9.26. EAC. STEERING. +7430 FRICTION IN PIVOTS. In our recent tests in France we have observed that the friction in the… | ||
| Scan255 | Tests conducted on a new axle pivot arrangement and its effect on steering performance and friction. | ||
| View original record | contd :- -2- strengths and set up in the cross steering tube. We have carried out a number of tests varying the ball end load and find that with the new axle pivot arrangement a range of from 5 to 9… | ||
| Scan256 | Potential solutions for steering wobble issues, including a patentable idea for a self-righting spring on the worm shaft. | ||
| View original record | To DA. Hs. } FROM R. c. to BJ. Wor. BY. PN. X457 R2/M6.10.26. STEERING WOBBLES. X.235 X.457 X.8430 If we can eliminate low and high speed wobbles by the use of the new axle, and by the hydraulic shock… | ||
| Scan257 | Use of hydraulic dampers to improve steering performance and prevent wobbles. | ||
| View original record | To Hs. from R. c. to BJ. Wor. c. to DA. BY. Mr. Claremont. X457 RL/M11.10.26. STEERING - HYDRAULIC DAMPERS - LEAN OF PIVOTS. X.8430 X.235 X.457. You will see in various memos. that I have suggested an… | ||
| Scan258 | Accident report from high-speed wobble testing where the steering lever broke at 70 mph. | ||
| View original record | To D/L. from Hs. Y457 Y735 Hs2/LG12.11.26. Accident on Fosse Rd., Oct. 22nd, 1926. Y4198 I was carrying out experimental tests in connection with high speed wobbles on the Fosse Rd. at Six Hills, and… | ||
| Scan259 | Provisional patent for a design related to steering wobbles. | ||
| View original record | X457 R. c. Hs. c. EJ. BY9/H. 12.10.26. RECEIVED OCT 12 STEERING WOBBLES. ----------- Referring to R2/M.6.10.26. and dealing particularly with the third paragraph, we previously protected this idea… | ||
| Scan260 | Recommending immediate production of a reinforced Phantom pendulum lever due to breakage. | ||
| View original record | To BY. from DA. c. to BJ. Hs. +457 DA1/M6.11.26. PHANTOM PENDULUM LEVER. X.8430 X.457 Herewith we send N.Sch.2297 shewing reinforced Phantom lever. This has been done on account of the breakage to one… | ||
| Scan261 | Steering tests for vehicle 12-EX, investigating a wobble issue at various tyre pressures. | ||
| View original record | To Hs. from GWH. X457 GWH/LG15.11.26. STEERING TESTS ON 12-EX - WITH THE FOLLOWING CONDITIONS :- X7430 F4565 6.75" tyres. Tyre pressure 35, 40, 45 lbs/sq.in. (front) 35 lbs/sq.in. (rear) Friction in… | ||
| Scan262 | Suspension issues like 'tossing', 'jouncing', and 'tramping' on 4-wheel brake cars, and offering potential solutions. | ||
| View original record | To OY. from Hs/Rm. c. to Hy. +457 Hs/Rm3/LG16.11.26. 43900 With reference to your complaints with regard to 'tossing' and jouncing' of front axles on 4-wheel brake cars; we are not familiar with the… | ||
| Scan263 | Low-speed wobble issues on 20 HP cars due to a lack of damping on steering pivots, and the costs to rectify. | ||
| View original record | X457 BY. C. Wor. (crossed out) C. Hs. BY2/H. 18.11.26. Despatched 30.11.26. Delay due to obtaining cost. 20 HP. LOW SPEED WOBBLES. Wor. Hs. and BY. met in conference and discussed the question of… | ||
| Scan264 | Tyre size, pressure and damper recommendations for Chassis 29-EE. | ||
| View original record | To CWB. from Hs. X457 Hsl/LG20.11.26. CHASSIS 29-EE. X457 X417 With reference to CWB1/GM19.11.26. There is no risk of high speed wobbles with the low pressure tyres on the 40/50 HP. car without front… | ||
| Scan265 | Wheel balancing tests for 33 x 6.75 inch tyres, focusing on inner tube joint placement. | ||
| View original record | X457 To BY. from Hs/AJL. Hs/AJL1/LG26.11.26. WHEEL BALANCING (33 X 6.75" tyres). X401 X4565 We have carried out tests to investigate the advantages gained by using inner tubes in which the joint in… | ||
| Scan266 | The issues with wheel balancing caused by the position of the joint in the inner tube relative to the valve. | ||
| View original record | contd :- -2- It is unfortunate that the alteration of the position of the joint in the tube has been made, for the following reasons :- (1) It is not conveniently possible to balance a wheel fitted… | ||
| Scan267 | Listing the moment of inertia for various wheel and tyre combinations related to high-speed wobbles. | ||
| View original record | X457 26.11.26 HIGH SPEED WOBBLES. +4050 / x8725 I of 6.75 tyre and tube - 70.4 lbs.ft.units. I of 6.00" tyre and heavy tube - 78.4 lbs.ft.units. I of disc and steel rim and wheel - 58.6 lbs.ft.units.… | ||
| Scan268 | Strategy for rectifying low-speed wobble issues on 20 HP chassis already delivered to customers. | ||
| View original record | HS XL657 To BY from BJ. Copy to Wor. Copy to Hs. 20 HP. Low Speed Wobbles. BJ18/E2/12/26 I gather that your memo. BY2/H18/11/26 only refers to chassis which have already been delivered to customers.… | ||
| Scan269 | Seriousness of low-speed wobbles and the decision on whether to alter 570 cars already delivered. | ||
| View original record | To SY from BJ. BJ18/E2/12/26 - 2 - about low speed wobbles and whether these are considered to be really serious as compared with complaints made by Sales officials, who may know exactly how to cause… | ||
| Scan270 | Low-speed wobble issues on the 20 HP chassis and the importance of fixing the fault. | ||
| View original record | X457 BY4/H. 3.12.26. p. Wor. c. Hs. 20 HP. CHASSIS. LOW SPEED WOBBLES. Referring to WJ18/E.2.12.26. I will make out a card as you suggest. My object, however, in writing you and giving you the… | ||
| Scan271 | Use of friction in 20 HP steering connections to prevent wobbles. | ||
| View original record | HS. X457 BY1C/H. 3.12.26. 20 HP. STEERING CONNECTIONS INTER-RELATED WITH FRICTION TO PREVENT WOBBLES. You will have noticed that we have, in accordance with the agreement arrived at between Wor. and… | ||
| Scan272 | Cover memo for a modified document concerning high-speed wobbles. | ||
| View original record | E (WW). [struck through] Hs Hm/NRO. [struck through] Mr. [struck through] BY/NW. [struck through] EP [struck through] XL57 BY/Mtn8/G.14.1.27. HIGH SPEED WOBBLES ----------------------- We attach… | ||
| Scan273 | Technical memorandum discussing the causes of high-speed wobbles, referencing Mr. Healey's paper on gyroscopic effects. | ||
| View original record | C O P Y. R. SJ. c. BJ. c. Hs. ------ BY7/H. 16.9.25. ---------------- HIGH SPEED WOBBLES. ---------------- Although the above matter interested me, I had never given it any really serious thought… | ||
| Scan274 | Technical analysis of diagonal or criss-cross oscillation caused by tyre errors and leaf spring systems. | ||
| View original record | - 2 - BY7/H. 16.9.25. ----------- data really contradicts this theory, if analytically considered, this seemed to me untenable. If one starts with the fact which is well ascertained that the tyres are… | ||
| Scan275 | The effect of diagonal oscillation on axle pivots and steering stability. | ||
| View original record | - 3 - BY7/H. 16.9.25. -------------- All the foregoing is well understood but what seems to have been overlooked is the effect of the diagonal oscillation on the pivots of the axle. The pivots have… | ||
| Scan276 | Analysis of wheel oscillation and the effects of lateral pivot pin inclination on vehicle dynamics. | ||
| View original record | - 4 - Assuming the above outline correctly describes what occurs, as I believe it does, then when violent oscillations begin to be reached a further effect comes into action, this time connected with… | ||
| Scan277 | The causes of wheel wobble, tramping, and oscillation in a front axle unit. | ||
| View original record | - 5 - is off the ground inclines the wheel which is on the ground forward, that is, makes it look in towards the frame, but immediately the energy of the wheel which is in the air is absorbed by… | ||
| Scan278 | Tests on heavy section inner tubes and inertia dampers to solve high-speed wobbles. | ||
| View original record | To R. from Hs/Rm. c. to BJ. Wor. c. to RG. E. c. to DA. BY. c. to OY. +457 Hs/Rm5/LG31.1.27. HIGH SPEED WOBBLES. x8430 (a) Heavy section inner tubes. We have carried out further tests increasing the… | ||
| Scan279 | Suggestions and experimental trials for improving a vehicle's steering system. | ||
| View original record | To Hs. DALBY. from R. c. to SJ. Wor. E. RG. +457 R3/M10.2.27. STEERING. X. 8430 X. 235 X. 5430 X. 457 I have read with interest Mr. Robotham/Hives memo. on the above. We must mind and keep the whole a… | ||
| Scan280 | Concerns and tests regarding high-speed steering wobble on the EAC-V11 model. | ||
| View original record | To R. from Hs/Rm. c. to BJ. Wor. c. to RG. E. c. to DA. BY. 4457 CERTIFICATE OF INSPECTION BY ROLLS-ROYCE ENGINES AND Hs/Rm3/LG16.2.27. X7430 X457 EAC-V11 STEERING. We are rather concerned with the… | ||
| Scan281 | Comparison table of linear movement and tube inclination specifications for different chassis models. | ||
| View original record | -2- CHASSIS. LINEAR MOVEMENT OF PEND:LEVER BALL PIN. ON FULL REBOUND. ON MAX: BUMP. INCLINATION OF TUBE IN ELEVATION (AT NORMAL POSITION). EAC-V11 Original tube. | .525 | .225 | 7½° up towards front.… | ||
| Scan282 | Tests conducted on balloon tyres and their effect on high-speed wobbles and vehicle performance. | ||
| View original record | X457 To Sg. from Hs/An. c. to BY. c. to Bs. BALLOON TYRES. X4565 We have conducted tests with balloon tyres on straight sided rims. These tyres were approximately 35 X 6.75". We actually compared… | ||
| Scan283 | Technical memo discussing steering geometry and the effects of a damped pendulum lever on high and low speed wobbles. | ||
| View original record | To R. from Hs/Rm. c. to BJ.Wor. c. to RG. E. c. to DA. BY. X457 Hs/Rm5/LG14.3.27 STEERING. 7730 With reference to R3/M6.3.27. (1) EAC.V11 GEOMETRY. From our tests on this chassis, we do believe that… | ||
| Scan284 | Potential improvements to steering, including reducing wobbles with spring-loaded friction and experimenting with self-centring mechanisms. | ||
| View original record | contd :- -2- If we introduce spring loaded friction into the pivots or cross steering tube on the other hand we reduce both low and high speed wobbles. On the new type axle as at present arranged we… | ||
| Scan285 | Improving steering systems by incorporating friction and spring centering to reduce road shocks and wobbles. | ||
| View original record | contd :- -3- However, increasing the dimensions of the worm and nut should result in consistency over a greater period. We are convinced that we can demonstrate that friction incorporated on the… | ||
| Scan286 | Potential improvements to steering systems, including spring geometry, damping, and a spring return scheme. | ||
| View original record | COPY. 4457 R3/MS.3.27. To Hs/Rm. To Da. BY. from R. c. to BJ. Worr E. EAC.7 STEERING. X7430 It is now considered that the spring geometry must be very accurate, though we found very little benefit… | ||
| Scan287 | Fitting of friction dampers on 20 HP cars with balloon tyres to prevent low speed wobbles. | ||
| View original record | To C. from Hs/Rm. X457 Hs/Rm2/LG22.3.27. BALLOON TYRES - 20 HP. f4565 Further to our Hs/Rm2/LG19.3.27. We omitted to mention in this note that friction must be fitted either in the pivots or in the… | ||
| Scan288 | Modifications to the steering worm, nut, and spring return system. | ||
| View original record | To DA. HS. BY. From R. c. to BJ. Wor. PN. E. CWB. +457 R2/M16.4.27. RE. STEERING WORM AND NUT. X.8430 X.235 AND SPRING RETURN. X.8420 X.457 My impression is that we fairly well know what we want for… | ||
| Scan289 | Self-centering steering mechanisms and design considerations for a 20 HP model. | ||
| View original record | contd :- -2- (4) Finally we come to the self centreing so necessary for slow steering, and quick and safe handling. Here we have schemed the independent spring return, which we want to try with the… | ||
| Scan290 | Front axles, discussing high-speed wobble and steering geometry on the 20 HP model. | ||
| View original record | To DA. from Hs/Rm. Hs/Rm4/LG27.4.27. X457 FRONT AXLES. X5820 X457 1. With reference to DA2/M25.4.27. We agree with 1. 2. and 4 of the points you raise. With regard to high speed wobbles, we do not… | ||
| Scan291 | Inquiring if reducing front axle weight has improved high-speed wobbles. | ||
| View original record | To Hs/Rn. From DA. 4457 DA3/M30.4.27. FRONT AXLES. X.8420 X.457 Thank you for your Hs/Rm4/LG27.4.27. With reference to high speed wobbles are we not right in saying that these high speed wobbles have… | ||
| Scan292 | Query on a calculation for the gyroscopic couple on a front axle during high-speed wheel wobble. | ||
| View original record | This calculation for the gyrostatic couple engendered in the front axle due to wheel twist during a high speed wobble assumes a constant mean angular velocity of precession. Actually the wheel is… | ||
| Scan293 | Low compression engine test conducted in a hangar. | ||
| View original record | EXPERIMENTAL REPORT. R.R. 493 (40 H) (SL 42 12-7-23). J.H., D. COPIES TO: R.C.J. BJ. WOR. By. E. Da. EP. PN. OY. OBJECT OF TEST: Low compression Engine in Hangar. TESTER: V. Halliwell CONDITIONS: XF10… | ||
| Scan294 | Hand-drawn diagram illustrating the physics of a gyroscope, with equations for precession and acceleration couples. | ||
| View original record | X457 Polar moment I Diametral moment I' Spin ω Precession Ω and Ω̇ (accn) Precession couple T = IωΩ Accn couple Q = I'Ω̇ | ||
| Scan295 | Analysis of high-speed wheel wobble, focusing on gyroscopic effects and tire wear characteristics. | ||
| View original record | SQUARE TREAD ROUND-TREAD VELOCITY OF TIRE AT POINT A = wR AT PT. B = wr Contact Area 1. INSPECTION OF WEAR OF ROUND-TREAD TIRES SHOWS THAT POINT A, HAVING GREATEST CONTACT PRESSURE, FOLLOWS THE ROAD,… | ||
| Scan296 | The reverse side of a document with a faint pencil sketch and a stamped mark. | ||
| View original record | ROLLS-ROYCE LIMITED. PRINT ROOM 4 10 MAY 1920 DERBY | ||
| Scan297 | Drawing analyzing high-speed wobble, tire wear, and gyroscopic effects on a vehicle's front axle. | ||
| View original record | SQUARE TREAD ROUND-TREAD VELOCITY OF TIRE AT POINT A = ωR AT PT B = ωr CONTACT AREA 1. INSPECTION OF WEAR OF ROUND-TREAD TIRES SHOWS THAT POINT A, HAVING GREATEST CONTACT PRESSURE, FOLLOWS THE ROAD,… | ||
| Scan298 | Blueprint showing various conceptual diagrams for steering and suspension systems to address high-speed wobble. | ||
| View original record | DRAWING NO. SEE ALSO THE FOLLOWING OPERATION DRAWINGS HYDRAULIC STEERING ANTI-GYROSCOPE EQUALISED STG I CRISS-CROSS SHOCK ABSORBERS EQUALIZED STEERING II Drawn by Traced by Checked by Approved by… | ||
| Scan299 | Front axle wobbling issues on the 20 HP model, referencing solutions involving different tyre sizes and steering components. | ||
| View original record | To DA. from Hs/Rm. +457 Hs/Rml/LG3.5.27. 20 HP. FRONT AXLE. Y5420 X5810 With reference to DA3/M30.3.27. Lightening the front axle on the 40/50 HP. did raise the critical wobbling speed somewhat, but… | ||
| Scan300 | Tests and modifications to address high-speed wobbles. | ||
| View original record | 4457. To RHC. from Hs/Rm. Hs/Rml/LG12.5.27. X457 X8420 HIGH SPEED WOBBLES. We have the following work we should like to do in connection with these tests. (1) Remove present axle and pivots from 98-NK… | ||
| Scan301 | Technical memo proposing a modification to a steering box chassis component using lengthened studs and a packing piece, including sketches. | ||
| View original record | STEERING BOX CHASSIS [Faint underlying text:] of this problem we have followed by giving a [illegible] and a slightly increased width of spring shackle [illegible] and shortened shackle. [Over-typed… | ||
| Scan302 | Road test report on high speed wobbles caused by a specific axle and wheel configuration. | ||
| View original record | x457 Hs/Rn/LG13.5.27. +8430 HIGH SPEED WOBBLES. We have carried out a road test on the old type axle with pivots such that the stub axle was at right angles to the king pin bearing, the result being… | ||
| Scan303 | Letter from the US to UK office regarding high-speed steering wobble, test results, and production delays. | ||
| View original record | X457 ROLLS-ROYCE OF AMERICA, INC. SPRINGFIELD, MASS. Oy2-E-52427 May 24, 1927. Mr. E. W. Hives, Rolls-Royce, Ltd., Derby, England. Steering Dear Mr. Hives: Noting that you are still pursuing high… | ||
| Scan304 | Figures related to high-speed wobble and the necessity for hydraulic shock absorbers. | ||
| View original record | Oy1-E-5627 May 6th, 1927 To: Mr. Nadin cc Mr. Hulley Mr. Caswell Mr. Burton From: Mr. Olley Re High Speed Wobble In connection with a note to Hs. of February 23rd, 1926, I sent the attached print in… | ||
| Scan305 | Technical drawing analyzing the causes and effects of high-speed wheel wobble, including gyroscopic moments and tire wear. | ||
| View original record | DRAWING NO. I SEE ALSO THE FOLLOWING OPERATION DRAWINGS SQUARE TREAD ROUND-TREAD VELOCITY OF TIRE AT POINT A = wR AT PT B = wR' CONTACT AREA 1. INSPECTION OF WEAR OF ROUND-TREAD TIRES SHOWS THAT POINT… | ||
| Scan306 | Drawing with calculations analyzing high-speed wheel wobble and gyroscopic moments. | ||
| View original record | DRAWING NO.: II SEE ALSO THE FOLLOWING OPERATION DRAWINGS 5 FT. 11 FT 10'(EST) 10'(EST) 72 M.P.H BRUISE ON ROAD SHOWING SIDE WALL OF TIRE SCRUBBING ROAD (THIS IS WHAT TWISTS THE WHEEL - SEE SK I) VEL.… | ||
| Scan307 | Issues with spring-loaded ball ends on the 20 HP cross steering tube and requesting design changes. | ||
| View original record | To DA. from Hs/Rn. +457 Hs/Rn1/LG26.5.27. 20 HP. SPRING LOADED CROSS STEERING TUBE. X5425 Since its inception, we have been in trouble with the spring loaded ball ends on the 20 HP. cross steering… | ||
| Scan308 | Company's policy on fitting low-pressure tyres and addressing potential customer concerns about wobbles. | ||
| View original record | To Hm. from Hs. +457 Hs1/LG31.5.27. AGREEMENT FORM. X4565 LOW PRESSURE TYRES. X457 We do not agree with para. underlined in red. Our view as regards low pressure tyres is that we want as many… | ||
| Scan309 | The investigation of high-speed wobbles, particularly the unexpected effect of shock damper loading on out-of-balance tyres. | ||
| View original record | To R. from Hs/Rm. c. to BJ. Wor. c. to RG. E. c. to DA. BY. c. to OY. X457 Hs/Rml/LG14.6.27. HIGH SPEED WOBBLES. X235 74214 It has been a source of surprise to us that beyond a certain point,… | ||
| Scan310 | Tests on vehicle frame wobble, exploring the effects of engine mass, inertia, dampers, and ballast. | ||
| View original record | contd :- -2- The amplitude of the wobble was not very great. Reducing the equivalent engine mass increased the amplitude of the wobble appreciably. We also ascertained that if we increased the moment… | ||
| Scan311 | Comparison of oscillation time and road speed wobble between an EAC.VII and a Hispano car. | ||
| View original record | contd :- -3- (A) (B) | | Periodic time for oscillation. | Equivalent road speed wobble in step. | Periodic time for oscillation. | Equivalent road speed wobble in step. | |---|---|---|---|---| |… | ||
| Scan312 | Eliminating high-speed wobbles by adjusting damper, spring, and frame stiffness. | ||
| View original record | contd :- -4- (2) If ever obstinate cases of high speed wobbles arise, it is of no use to attempt to eliminate them by increas- ing the front damper loading unless the rear of the car is also suitably… | ||
| Scan313 | Graph and diagrams comparing the rigidity and periodicity of a Hispano frame versus an E.A.C.7 frame. | ||
| View original record | TORQUE LBS / FT. 1800 1600 1200 800 400 HISPANO FRAME E.A.C.7 FRAME REAR AXLE CLAMPED SOLID TO FRAME. 1° 2° 3° 4° FRAME DEFLECTION ANGLE θ 3.5° ↓P θ FRAME RIDIGITY AND PERIODICITY. | ||
| Scan314 | Suggestion for an experiment to address high-speed wobbles by modifying the front axle suspension. | ||
| View original record | +457 As From Pt. to By H.E. C.W.R. War. At sea. 21/6/27. re high speed wobbles. Since leaving Derby I have been giving a good bit of thought to the above problem and am writing to know what you think… | ||
| Scan315 | Modifications for a 20 HP chassis to address low speed wobbles and a clicking noise in the steering system. | ||
| View original record | Hs JUN 28 1927 RECEIVED (Stamp) 7457 (Handwritten) BY/HEB (Struck through) C.BY/HM. c.Hs. BY2/H. 23.6.27. 20 HP.CHASSIS. X In order to overcome low speed wobbles, also at the same time a clicking… | ||
| Scan316 | Standardisation of a spring loaded front end side steering tube to prevent low speed wobbles. | ||
| View original record | RR 755 REVISED (10H) (DE 649 9-12-26) BM. 2/1187. 457. COMPLETED 8.7.27. STANDARDISATION of CHASSIS PARTS. Description of Parts. SPRING LOADED FRONT END SIDE STEERING TUBE. Origin. To assist in… | ||
| Scan317 | The standardisation of chassis parts, detailing costs and testing schedule. | ||
| View original record | STANDARDISATION OF CHASSIS PARTS (1) The number of the first chassis on which the new part will be fitted. 'L' series. (2) Date when the chassis will be handed to test. 8.10.27. (3) Cost of scrapped… | ||
| Scan318 | Correcting a previous statement on the torsional stiffness of the Hispano frame compared to the 40/50. | ||
| View original record | To DA: from Hs/Rm. (Y45) Hs/Rm3/LG11.7.27. HIGH SPEED WOBBLES. K4214 In our Hs/Rml/LG14.6.27. page 3, we stated that the Hispano frame is weaker in torsion than the 40/50. This is incorrect. It is… | ||
| Scan319 | High-speed wobble issues, tyre recommendations, and steering control in relation to Australian accidents. | ||
| View original record | To Ft. from Hs/Rn. X457 Hs/Rn2/LG17.10.27. AUSTRALIAN ACCIDENTS. X8990 With reference to your various memos. re. accidents. We note that Mr. Napier Birks has 5.77 semi balloon tyres fitted to his car.… | ||
| Scan320 | Low speed steering wobble on the 20-HP chassis based on test results and complaints. | ||
| View original record | Hs. DV XH57 EP7/H2.11.27. re. 20-HP. Chassis Steering. We have recently had one or two complaints during our final test of complete cars at Coachbuilders that the steering suffers from low speed… | ||
| Scan321 | Proposal from Dunlop to film high speed wobbles on a bumping rig. | ||
| View original record | X457. To R. from Hs. c. to BJ. HIGH SPEED WOBBLES. Dunlops have approached us to allow them to take a cinematagraph film of a high speed wobble on our bumping rig. We could easily arrange it on a bare… | ||
| Scan322 | Steering wobbles and joggles on the 20 HP model with a standardised spring-loaded ball end. | ||
| View original record | X457 To EP. from Hs/Rm. c. to BY. Hs/Rm3/LG3.11.27. X5450 With reference to EP7/H2.11.27. Two months ago we standardised the spring loaded ball end at the front of the 20 HP. side steering tube. This… | ||
| Scan323 | Investigating 'Wheels Incorporated', a New York company that rectifies steering errors and high-speed wobbles in American cars. | ||
| View original record | To OY. from Hs/Rm. 1457 X8430 X424 The Dunlop Co. have told us that there is a corporation called "Wheels Incorporated" at 835 11th. Avenue, New York whose business it is to rectify the errors in the… | ||
| Scan324 | Experiments and observations on the phenomenon of wheel wobble. | ||
| View original record | To Basil Joy WHEEL WOBBLE. Y457. MR. ROBOTHAM : I have had the opportunity of observing experiments on Wheel Wobble and one of them consisted in driving the front wheels of a chassis by 2 drums and… | ||
| Scan325 | High-speed wobble (shimmy) in cars, detailing experiments and observations. | ||
| View original record | contd :- -2- In one of our experiments a high speed wobble was so powerful that it absorbed 20 HP. at 65 m.p.h. and at that speed each wheel in turn left the road for 9 ft. THE AUTHOR : Not vertically… | ||
| Scan326 | The multiple factors contributing to a vehicle dynamics phenomenon. | ||
| View original record | contd :- -3- point of contact, axle weight and the disposition thereof, wheel camber, gather, cant, steering geometry and reversibility, spring mounting and flexibility, shock absorber nature and… | ||
| Scan327 | Test report on the effect of removing the pivot bearing end plate on high speed wobbles. | ||
| View original record | X457 Hs/Rm/LG22.3.28. HIGH SPEED WOBBLES. We ran a car on which all the end plate was taken out of the pivot bearing. This has not appreciable effect on high speed wobbles, if anything the effect was… | ||
| Scan328 | Objections to irreversible steering, addressing issues like high-speed wobble and the role of wheel inertia. | ||
| View original record | To R. from Hs/Rn. c. to BJ. WOP. c. to E. DA. c. to BY. OY. V457 Hs/Rm2/LG2. 4. 28. 20 HP. & 40/50 STEERING. 78430 75430 With reference to R1/M25.3.28. Our objections to an irreversible steering are… | ||
| Scan329 | Steering wobble (shimmy) and proposed solutions by modifying wheel and king pin geometry. | ||
| View original record | contd :- -2- violently, does not lead us to suppose that parallel moving wheels are a certain cure from our present troubles. We think that the Lancia steering with balloon tyres is very far from… | ||
| Scan330 | Using front engine arms to reduce high-speed wobbles on the Phantom model. | ||
| View original record | Hs. E. DA. BY. from R. c. to BJ. Wor. X457 R8/M7.4.28. PHANTOM - HIGH SPEED WOBBLES. X.457 X.8380 It has occurred to me that when we use front engine arms as in 'SS' they may reduce the risk of high… | ||
| Scan331 | Letter from the American branch discussing fitting Truffault shock absorbers to sports cars to address front-wheel wobble. | ||
| View original record | +457 Rolls-Royce America Inc., Springfield, Mass. April 12th. 1928. Na5/B41228. Att. Mr. Hives. c. to Mr. Bailey. Mr. Basil Johnson, Rolls-Royce Ltd., 14-15 Conduit St., London, England. RE. SHOCK… | ||
| Scan332 | Proposing a high-speed road test of a 6-cylinder Bentley to investigate 'high speed wobbles'. | ||
| View original record | +457 To PN. from Hs/Rm. c. to CWB. Hs/Rm3/LG14.6.28. 6-CYL: BENTLEY. X3805 With reference to FN1/WT13.6.28. We should very much like to try with you the 6-cyl. Bentley under high speed conditions on a… | ||
| Scan333 | Front axle tests altering the wheel centre point to improve steering and reduce wobble. | ||
| View original record | To R. from Hs/Rn. c. to BJ. Wor. c. to E. DA. c. to BY. X457 Hs/Rml/LG1 'SS' FRONT AXLE. X7420 We have been running the present standard axle with stub axles so altered that the wheels are 1.75" out… | ||
| Scan334 | Experiments with king pin angles, pivots, and front braking systems. | ||
| View original record | contd :- -2- We have a number of experiments running with altered king pin angles and pivots with horizontal trail, but so far have found nothing that is so effective as simply lengthening the… | ||
| Scan335 | Increased moment of unbalanced force on the 'SS' front axle and requesting a test. | ||
| View original record | Hs. from DA. 457. DA2/M22.6.28 'SS' FRONT AXLE. X.7420 X.401 X.457 With reference to Hs/Anl/LG18.6.28., R. thinks that an objection to putting the wheel further from the plane of the pivot would be… | ||
| Scan336 | Wheel balance issues, high-speed wobbles, and tests related to the 'SS' front axle. | ||
| View original record | 4457 To DA. from Hs/Rm. Hs/Rml/LG27.6.28. 'SS' FRONT AXLE. X7420 With reference to your query in DA2/M22.6.28. We did some tests in 1925 on this subject (see Hs/Rml/LG 31.8.25 and Hs6/LG2.9.25). The… | ||
| Scan337 | Technical memo detailing steering improvements for the 40/50 HP model, focusing on overcoming high-speed wobbles. | ||
| View original record | To R: from Hs/Rn. c. to BJ. Wor. c. to E. DA. c. to BY. OY. c. to PN. CWB. Y457 Hs/Rn2/LG5.7.28. 40/50 HP. STEERING. X7380 X7430 Two factors have always limited the selectivity of the RR. 40/50… | ||
| Scan338 | Experiments with frame stiffness, damping, and suspension to improve high-speed selectivity and riding comfort. | ||
| View original record | contd :- -2- The frame stiffness is worth having, because if we revert to single point mounting, which we can do in a few minutes on our [strikethrough]skg[/strikethrough] experimental arrangement, we… | ||
| Scan339 | Vehicle steering, suspension, and engine mounting tests, addressing issues like wobbles and wandering. | ||
| View original record | contd :- -3- From these further tests we still consider that having the tyres 1.75" out of centre point is a definite advantage; as you suggested we put the wheels out of balance and the consequent… | ||
| Scan340 | Graph comparing the torsional rigidity of different frame configurations under load. | ||
| View original record | FOR THESE TESTS THE FRAME WAS SUPPORTED AT THE REAR ON JACKS THEREBY ELIMINATING THE FLEXIBILITY OF THE REAR SPRINGS. LOAD STANDARD FRAME PLUS X MEMBER UNDER RADIATOR PLUS 4 POINT MOUNTING TORQUE LBS.… | ||
| Scan341 | Blank page with a date stamp from the T Room in Derby. | ||
| View original record | ROYCE, LIMITED T ROOM, 5 JUL 1928 DERBY. | ||
| Scan342 | Blueprint diagram of an X-shaped cross-member fitted to the 10-EX model. | ||
| View original record | ENGINE MOUNTING IS PIVOTTED HERE TO OBTAIN 2-POINT FRONT MOUNTING, DOWELS ARE INSERTED HERE. 1/4" DEEP FISH PLATES X-SHAPED CROSS-MEMBER FITTED TO 10-EX | ||
| Scan343 | Page with a red stamp from the print room. | ||
| View original record | ROLLS-ROYCE, LIMITED PRINT ROOM, 5 JUL 1918 DERBY. | ||
| Scan344 | Investigation into high-speed wobble, attributing the issue to low tyre pressure and small diameter wheels. | ||
| View original record | To R. from HS/Rn. c. to BJ. Wor. c. to E. DA. c. to BY. X457 HS/Rm2/LG21.8.28. 12-G-4 - STEERING. X5820 X5430 We tried this car as soon as it returned from WW. We found that it had a normal incipient… | ||
| Scan345 | The effects of rim sizes and tyre pressures on vehicle handling and comfort. | ||
| View original record | contd :- -2- The 19" rims make 3% more revs. at any given speed than the 21" rims with 6" tyres. Therefore the road speed at which the wheel revs. can coincide with the critical criss-cross axle… | ||
| Scan346 | Steering tests for car 12-G-4, investigating wobble and 'shimmy' with different tyres. | ||
| View original record | To R. from Hs/Rn. c. to BJ. Wor. c. to E. DA. BY. +457 Hs/Rn2/LG27.8.28. 12-G-4 - STEERING. X5430 X5820 We have run this car with 5.25" and 6" tyres on 21" rims. Whilst the steering is definitely… | ||
| Scan347 | Modifications to the 'SS' front axle to reduce high-speed wobble and steering shocks. | ||
| View original record | BY. from DA. c. to BJ. HS. 4457 DA2/M21.9.28. 'SS' FRONT AXLE. X.7420 XX143X X.457 X.7810 We send herewith N.sch.2713 shewing the axle with 1" increased drop modified to give 1.750 offset between the… | ||
| Scan348 | Steering wobble issues found in the 66-YC car and the modifications made to correct it. | ||
| View original record | X457 X8450 To CWB. from Hs/Rn. Hs/Rml/LG6.10.28. 66-YC CAR. With reference to CWB5/GM3.10.28. We tried this car in the condition complained of. We did not consider that the steering was abnormally… | ||
| Scan349 | Suggestion on car engine mounting to improve suspension and reduce high-speed wobbles. | ||
| View original record | Hs. from R. DA. E- 457 R2/M1.10.28. CAR ENGINE MOUNTING G.4. & EAC.10. X.5005 X.7005 X.457 I suggest that probably the best suspension of the engine will be vertically rigid at the front, and flexible… | ||
| Scan350 | High-speed wobble tests comparing Michelin and Dunlop tyres. | ||
| View original record | +457 To R. from Hs/Rn. c. to BJ. Wor. c. to DA. E. c. to BY. Hs/Rn7/LG26.10.28. HIGH SPEED WOBBLES. We have recently been carrying out tests on Michelin tyres. These tyres are called 17 X 50 and are… | ||
| Scan351 | Weight comparison between Michelin and Dunlop tyres, tubes, and wheels. | ||
| View original record | contd :- -2- Particulars of the Michelin compared with the standard 6.75" Dunlop are :- | Weight. | DUNLOP 6.75 - 21" rims. | MICHELIN. 17 X 50. | |---|---|---| | Tyre. | 36 1/2 lbs. | 35 lbs. | |… | ||
| Scan352 | Tests of repositioned shock absorbers on a Phantom to prevent high-speed wobbles. | ||
| View original record | To R: from Hs/Rm. c. to BJ. Wor. c. to DA. Oy c. to By. 4457 Hs/RmL/LG13.11.28. HIGH SPEED WOBBLES. X2354 48430 We carried out tests on the Phantom to determine if shock absorbers applying load at the… | ||
| Scan353 | Blueprint detailing the front axle and shock damper positioning to address high-speed wobble. | ||
| View original record | ROLLS-ROYCE LIMITED PRINT ROOM, 12 NOV 1928 DERBY. HIGH SPEED WOBBLE AND SHOCK DAMPER POSITION. 16.0" 23.5" | ||
| Scan354 | Low-speed wobbles on the 20 HP car and a proposed 10,000-mile test car. | ||
| View original record | To R. from Hs/Rm. c. to DA. BY. c. to SG. Wof. c. to E. PN. c. to EP. X457 Hs/RM/LG11.4.29. X 5840 G.S. - PROPOSED 10,000 MILES TEST CAR. With reference to R1/M5.4.29. reporting on low speed wobbles… | ||