Rolls-Royce Archives
| Identifier | Entry | ||
| Scan0 | The performance and specifications of 'India' front springs with varying stiffness on 20 HP cars. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs7/LG1.7.25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. S E C R E T. 'INDIA' FRONT SPRINGS. X5410… | ||
| Scan1 | Continued memo asking which springs to standardise. | ||
| View original record | contd :- -2- to know what he should instruct. Which springs do you wish to standardise? Hs. | ||
| Scan2 | Secret memo discussing the testing of stronger springs for front wheel brakes on cars intended for India. | ||
| View original record | To Hs. from BJ. S E C R E T. BJ7/H29.6.25. RE. INDIA. With reference to the two secret cars you brought down last week, to be tried by H. CWB. and BJ., we found the new strong springs necessary for… | ||
| Scan3 | Tests of contact breaker rubbing block material, with a focus on Bone Grey Fibre. | ||
| View original record | To R & E. from EFC. c. CJ. & PN. c. Da. By. c. Wor. Rg. c. Wd. EFC3/T1.7.25. ORIGINAL X.4646 - TESTS OF CONTACT BREAKER RUBBING BLOCK MATERIAL - AND IN PARTICULAR OF BONE GREY FIBRE. The up to the… | ||
| Scan4 | Test report comparing the properties of bone grey fibre and continental bakelite, recommending its standardisation. | ||
| View original record | -2- Contd. A considerable number of tests on these various materials has been made, the results of which are detailed below. Though it is a fact that the bone grey fibre is more susceptible to… | ||
| Scan5 | Hygroscopic and wear tests comparing bakelite and bone grey fibre materials. | ||
| View original record | EFC3/T1 7.25. -3- Contd. Test No.O. 15.7.24. Hygroscopic test of bone grey fibre (2nd. sample) My assistant's report runs as follows :- "This test consisted of a comparison between bakelite and bone… | ||
| Scan6 | Series of wear tests on continental bakelite and bone grey fibre materials under various lubrication and running conditions. | ||
| View original record | EFC3/T1.7.25. -4- Contd. Test No.4. 6.6.23. Bench tests for wear of continental bakelite WITH cam lubricated. Equivalent miles run 10,000. Wear observed .004" Test No.5. 31.1.24. Bench tests for wear… | ||
| Scan7 | Test report detailing wear results for 'Bone grey fibre' samples under various chassis and bench conditions. | ||
| View original record | EFC3/T1.7.25. -5- Contd. Test No.10. 8.12.24. Bone grey fibre (second sample) run on 98-NK 14,800 miles under severe chassis conditions in France. Wear .007". Condition of block quite satisfactory.… | ||
| Scan8 | Test results for bone grey fibre samples run on different chassis. | ||
| View original record | Contd. -6- EFC3/T1.7.25. Test No.16. 17.6.25. Bone grey fibre (second sample) Run on chassis GF.68 and 8-GIII for 10,090 miles under normal chassis conditions. Maximum wear .012" Test No.18. 17.6.25.… | ||
| Scan9 | Report on the R.A.E. petrol pump being fitted to Direct Drive Condor engines. | ||
| View original record | To R. from Hs. c.c. to CJ. BJ. c.c. to RO. R. c.c. to BY. Wor. Hs6/LG2.7.25. ORIGINAL R.A.E. PETROL PUMP. x4535 u4097 We attach a report in connection with the above. The Mark Direct Drive Condor… | ||
| Scan10 | The performance of a geared type R.A.E. petrol pump. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF HS/TAG/LG27.6.25. R.A.E. PETROL PUMP - Geared type. A R.A.E. petrol pump No.109 was fitted to one of our experimental… | ||
| Scan11 | Performance data report comparing the average of 8 R.A.E. pumps with an original R.A.E. pump on a Condor engine. | ||
| View original record | -2- Pump speed = .204 : 1 on the Condor engine. AVERAGE OF 8 RAE. PUMPS. REF. Expl. No. EXPERIMENTAL REPORT. R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. | Engine. R.P.M. Condor. | Pump R.P.M. |… | ||
| Scan12 | The alterations for the 'W' series chassis. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF Hs3/LG2. 7. 25. C To CJ. from Hs. 'W' SERIES. 48770 The alterations on 'W' series consist of :- (1) Wider and higher… | ||
| Scan13 | Proposal to fit duralumin connecting rods to the E.A.C. engine to reduce vibration and weight. | ||
| View original record | TO Div. (struck through) HS.} FROM R. ORIGINAL R R6/M3.7.25. E.A.C. ENGINE. Y8770 (struck through) Y8030 It has occurred to me that the E.A.C, engine might be greatly benefited by fitting duralumin… | ||
| Scan14 | Customer complaints of uneven slow running caused by the autovac system on Silver Ghost cars. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs2/L04.7.25. C To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. EY. c. to H. RP. c. to Wor. RE: AUTOVAC. Y3579 We have… | ||
| Scan15 | Troubleshooting a rich fuel mixture issue caused by the autovac system. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: HS2/LG4.7.25. C which is used on the Hispano; this has the same fault. We have tried connecting the autovac to… | ||
| Scan16 | Letter from Autovac Mfg. Co. regarding experiments to improve their apparatus. | ||
| View original record | COPY. The Autovac Mfg. Co. Heaton Norris. Stockport. C 3rd.July 1925. Messrs. Rolls-Royce Ltd., Derby. Dear Sirs, We are in receipt of yours of the 2nd. inst. and quite agree with your remarks. We… | ||
| Scan17 | Fitting new aluminium induction parts, using water heating, and improved tappets to a 7-EX car chassis. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. ORIGINAL EXPERIMENTAL REPORT. Expl. No. REF: H64/L06.7.25. C To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. EY. c. to Wor. 7-EX CAR. EAC. CHASSIS FOR R.… | ||
| Scan18 | Wider dash, louvered bonnet, and radiator modifications. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: H84/LC6.7.25. Wider dash and louvered bonnet. The dimensions of the dashboard and bonnet are similar to those which… | ||
| Scan19 | Modifications to the radiator, luggage grid, and gearbox mechanism. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF HGM/LG6. 7. 25. C the same as 'V' series. The radiator cap has been modified. It is arranged that when the radiator cap… | ||
| Scan20 | Issues with springs, petrol tank design, and instrument layout. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. REF H84/LG6.7.25. with clearance. It is suggested however that both the plunger springs and the spring for sideways… | ||
| Scan21 | Modifications to a cylindrical tank, rear brake adjustment covers, shutter control, and a list of further new parts to be fitted. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -5- Expl. No. REF: Hed/1/C6. 7. 25. The capacity of the cylindrical tank is 1.025 galls. compared with 1.2 gallons of the one fitted to… | ||
| Scan22 | Bumping tests conducted on the front of a 20 HP chassis. | ||
| View original record | R.R. 493 (40 H) (SL 42 12-7-23). J.H., D. ORIGINAL EXPERIMENTAL REPORT. C COPIES TO: R.CJ BJ WOR. By E. Da EP. PN. OY. RG Expl. No. 4268 x 64-10 REF. Hs2/L97.7.25. OBJECT OF TEST. Bumping tests on… | ||
| Scan23 | Bump test conducted on a 20 HP 'G' series chassis. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/LS/LG3. 7.25. C BUMP TEST OF 20 HP. 'G' SERIES CHASSIS. Bumping front axle - Drum revs. 105. 2" lift cams, one on each… | ||
| Scan24 | Failures of steering and suspension components during endurance testing. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/LS/LGS.7.25. there is comparatively no strain upon this flange and bolts. Steering column supporting tube sheared… | ||
| Scan25 | Failures of chassis and engine components during endurance testing. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: He/LS/LCS:7.25. Two opposite corners of N.S. flange of front of 6th. cross member cracked after 52 hrs. other two… | ||
| Scan26 | Component failures due to vibration, covering spring clips, dashbrackets, and radiator springs. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. REF Hs/LS/LG3.7.25. C there is slight vibration, bolts invariably breaking across waisted portions. hrs. mins. Front spring… | ||
| Scan27 | Road spring failures, detailing life, position, and material properties. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -5- Expl. No. REF: Hs/LS/LG3.7.25. ROAD SPRING FAILURES. Table of results: | Life of spring. hrs.mins. | Piece No. | Position on chassis.… | ||
| Scan28 | Performance, specifications, and testing of tungsten points. | ||
| View original record | To R. from EFC. c. CJ. c. EY. EFC9/T8.7.25. ORIGINAL. X.2894. TUNGSTEN POINTS. ----------- Reference your note R2/M3.7.25. A further dozen sets of tungsten points are being obtained and these will be… | ||
| Scan29 | Cover sheet for a report on chassis 95-NK after 25,071 miles. | ||
| View original record | ORIGINAL c To R. from Hs. c. to CJ. BJ. c. to RS. E. c. to DA. BY. c. to EP. Wor. REPORT ON CHASSIS 95-NK AFTER 25,071 MILES. We attach copy of report in connection with the above car which is running… | ||
| Scan30 | The condition of chassis 93 MK after 25,071 miles of testing. | ||
| View original record | Hotel de France, Chateauroux, Indre. France. To: "Hs" From: G.W.Hancock. Report on chassis 93 MK after 25,071 miles. ENGINE. Power. This has kept very good throughout tests. Lubrication of cylinders.… | ||
| Scan31 | Condition report on various engine and exhaust components, noting issues with exhaust boxes, silencer lagging, and the magneto drive coupling. | ||
| View original record | - 2 - Also in bearing through crankcase for carburetter controls, and accelerator connecting lever from countershaft to cross shaft. Inlet pipe. This is still in good condition. We have now fitted new… | ||
| Scan32 | The condition and issues with various components including connecting rods, ignition, and bonnet fittings. | ||
| View original record | - 3 - C Ring nut for retaining air valve cap has worked loose on two occasions. Fan bracket, fan & fan belt. These are in good condition. We have not had any vibrations from fan, and experienced no… | ||
| Scan33 | Condition report detailing the state of various vehicle components after testing. | ||
| View original record | - 4 - Engine guards. We consider these to be O.K. Engine has kept very clean under very exacting conditions. Gearbox undershield. This, as previously reported, could extend further back to take care… | ||
| Scan34 | Inspection report detailing the condition of various vehicle components including the engine coupling, clutch, axle, brakes, and springs. | ||
| View original record | - 9 - Engine fabric coupling. This coupling, after 21,624 miles, has not deteriorated since our last report. The fabric is quite sound, and we consider this coupling to be quite O.K. Clutch. We took… | ||
| Scan35 | Condition report detailing issues and repairs for various vehicle components. | ||
| View original record | - 6 - C Front shock absorbers. We have dismantled these and found that the serrations had become rusted up, preventing the action of the spring upon the leather cones. We have made these O.K. Rear… | ||
| Scan36 | Report page detailing an under-car examination and performance test results for speed, petrol, and oil consumption. | ||
| View original record | - 7 - C General examination underneath the car. Tie rod brackets, diagonal stays & brackets, rear spring main bearing supports, equalising shafts and brackets, bearings on intermediate shafts of… | ||
| Scan37 | Design and performance of a new scraper ring pattern with a central groove and drainage holes. | ||
| View original record | TO RS.) FROM HS.) ORIGINAL R ENGINES, GENERAL R3/M8.7.25. SCRAPER RINGS. 12103 Col. Fell tells me that the scraper ring with a groove in the centre of the face and perforations through to the inside… | ||
| Scan38 | Cover sheet for a summary of faults found during a 10,216-mile test on Chassis 9-C-111. | ||
| View original record | C To R. from Hs. c. to CJ. BJ. c. to E. RG. c. to DA. SY. c. to Wor. EP. ORIGINAL Hs2/LG9.7.25. CHASSIS 9-C-111. X5840 We attach a sheet which gives a summary of faults during 10,216 miles test,… | ||
| Scan39 | Fault log for chassis 9 G.III, detailing issues found over a 10,216-mile test. | ||
| View original record | C Chassis 9 G.III. Summary of faults during 10,216 miles test, carried out from 31.5.25 to 28.6.25. Tested at. Miles run. Total miles. Remarks. Chateauroux. 2,769 2,769 Top leaf of N.S.F. spring… | ||
| Scan40 | Investigating low and high-speed steering wobbles and the effectiveness of a spring control friction damper. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. ORIGINAL Expl. No. REF: Hs4/LG17.7.25. q To R. from Hs. c.c. to CJ. BJ. c.c. to RG. E. c.c. to DA. BY. c.c. to Wor. STEERING. +4214 +457… | ||
| Scan41 | Steering oscillation, wobble, and the effect of a damped pendulum lever and buffer springs. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: He4/LG17.7.25. alternatly or 'tramping'. It then builds up into a wobble which causes violent oscillation of the… | ||
| Scan42 | Investigating the blackening of EAC battery ignition contact points due to oil vapour. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. 8680 REF: HPC/TDC.T.25. To R. From HPC. c. CE. E. c. By. By/RD. EAC. BATTERY IGNITION. X8680 X4652 It is now practically… | ||
| Scan43 | The prevention of oil vapour in the rotor chamber and proposing tests on a modified distributor unit. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.B. -2- EXPERIMENTAL REPORT. Contd. Expl. No.6680 REF:EFC/T We have put the matter up to the D.O. here give us a temporary experimental contact breaker unit, in… | ||
| Scan44 | Experiments with tungsten points and ignition coils for reduced current. | ||
| View original record | Contd. -3- 8680 EPCS/T20.7.25. In addition we have the experiments of the larger tungsten points, and also separately or in conjunction with, as the case may be, ignition coils with finer primaries… | ||
| Scan45 | Testing the efficiency of steering. | ||
| View original record | R.R. 493 (40 H) (SL 42 12-7-23). J.H., D. ORIGINAL EXPERIMENTAL REPORT. C COPIES TO: (RCJ) (BJ) (WOR) (By) (E) (Da) (EP) PN. OY. (RG) Expl. No. 8430 REF. Hs4/LG21.7.25. OBJECT OF TEST. E. A. C. Test… | ||
| Scan46 | The friction losses in the E.A.C. steering box. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: HS/ACL/12-6-25 FRICTION LOSSES IN THE E.A.C. STEERING BOX. We have analysed the principal friction losses in the standard… | ||
| Scan47 | Efficiency and friction test results for various mechanical components. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. -2- EXPERIMENTAL REPORT. Expl. No. REF: /ACL/IG21725 C The results were corrected for the friction of the ball bear- ings, which was very small. For the… | ||
| Scan48 | Calculation determining the required efficiency of a rocker shaft to achieve a specific overall efficiency. | ||
| View original record | contd :- -3- Rocker shaft. From consideration of the above, the efficiency of the rocker shaft in transmitting torque must be 96% to give an overall efficiency of 58.2% Hs/ACL. | ||
| Scan49 | Blank, aged, hole-punched sheet of paper with a blue reinforced edge. | ||
| View original record | ", | ||
| Scan50 | Comparison of a front spring fitted to a Springfield chassis with a Woodhead spring. | ||
| View original record | To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. Hs1/LG23.7.25. SPRINGS FOR THE AMERICAN R-R CHASSIS. X3900 X2628 Attached is a comparison of a front springs fitted to the… | ||
| Scan51 | Comparison of specifications for American and Woodhead front springs for chassis S-167-MK. | ||
| View original record | 17-7-25 a PARTICULARS OF FRONT SPRINGS OF AMERICAN CHASSIS N° S-167-MK. DIMENSIONS GIVEN ARE THOSE OF RIGHT HAND SIDE FRONT SPRING. THE COLUMNS OF SMALL FIGURES REFER TO A SIMILAR SPRING MANUFACTURED… | ||
| Scan52 | Modifications to a 20 HP car with 4-wheel brakes. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. ORIGINAL EXPERIMENTAL REPORT. Expl. No. REF: Hsd/L/322. 7.24 C To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. EY. c. to Wor. SECRET. X5770 X5840 20 HP:… | ||
| Scan53 | Car 9-G-111's condition after 10,000 miles and its preparation for final work and testing before going to France. | ||
| View original record | contd :- -2- C 9-G-111 - the car which is going to France has already run 10,000 miles out there. On examination, when it returned to the Works, most of the parts were found to be in excellent… | ||
| Scan54 | Modifications and tests of the 4-wheel braking system on 20 HP cars. | ||
| View original record | R.R. 493a (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. To R. from Hs. c. to CJ. BJ. c. to RG. DA. c. to BY. E. c. to WCr. Expl. No. ORIGINAL REF Hs6/LG23. 7. 25. c SECRET. Y.5770 Y.5940 20… | ||
| Scan55 | Continued memorandum regarding brake squeaks and damper efficiency on various car models. | ||
| View original record | contd :- -2- C with a spring round the drum are 75% efficient. The heavy dampers which were run on cars are 95% efficient. Therefore as regards brake squeaks on India production cars, we anticipate… | ||
| Scan56 | The testing of magnesium pistons. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs9/LG23.7.25. C To R. from Hs. c. to C.J. B.J. c. to E. RG. c. to BA. BY. c. to Wor. ORIGINAL 48040 MAGNESIUM PISTONS.… | ||
| Scan57 | Issues with the vacuum feed system on 20HP Silver Ghost and New Phantom models, and potential alternatives. | ||
| View original record | R.R. 235A (100 T) (S.H. 159, 11-8-20) G. 2800 ENGINE ORIGINAL R TO HS. FROM R. C. to CJ. BJ. EP. HM. CWB. R7/M24.7.25. re. VACUUM FEED. X3579 X5510 X8510 It has been pointed out that the vacuum feed… | ||
| Scan58 | Failures of the battery ignition distributor on experimental chassis and proposals for experiments to prevent them. | ||
| View original record | ORIGINAL To R. } from EFC. EPCL/T12.8.25. c. to OJ. Nor. c. Hy. c. By. X.8691 - EAC. BATTERY IGNITION DISTRIBUTOR. We have now received EL/M10.8.25 and E1/M10.8.25. In addition to the points already… | ||
| Scan59 | Experiments investigating chassis sparking and tracking in the 20 HP engine distributor head. | ||
| View original record | Contd. -2- 1 EPC2/T1.2.8.25. head. There is also a report EPC2/T18.9.23 of experiments to determine if, in any circumstances of running on 20 HP. chassis sparking will occur in the battery ignition… | ||
| Scan60 | Steering 'V' Series tests to resolve low-speed steering wobbles. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. X8430 REF: Hs/Rm2/LG12. 8. 25. ORIGINAL To R. from Hs/Rm. c. to Hs. STEERING 'V' SERIES. X8430 x457 With reference to the… | ||
| Scan61 | Investigations into the causes and potential solutions for high-speed steering wobbles. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. ORIGINAL Expl. No. REF: Hs/Rml/LG12.8.25. C To R. from Hs/Rm. c. to Hs. HIGH SPEED STEERING WOBBLES. 4457 X8430 We have been carrying… | ||
| Scan62 | High-speed steering wobbles, detailing the effects of varying tyre pressures and side steering tube springs. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: He/Rml/L.G12.8.25. C As an example, we obtained a wobble at 66 m.p.h. with a tyre pressure of 60 lbs. per sq.in. This… | ||
| Scan63 | The design of bonnet louvres for the New Phantom, suggesting a compromise design similar to the Hispano. | ||
| View original record | [Header] TO | ||
| Scan64 | Cover note for a testers report on the New Phantom Vacuum Feed Tank. | ||
| View original record | ORIGINAL To R. from Hs/THW. c.c. to CJ. E.J. c.c. to RG. E. c.c. to DA. EX. c.c. to Wor. Hs/THW2/LG14.8.25. +8570 X3579 NEW PHANTOM VACUUM FEED TANK. With reference to R2/M11. 8.25 and DA3/M11. 8.25.… | ||
| Scan65 | Tests conducted on the Steering 'V' series, concerning driving springs and low-speed wobbles. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.L. EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rm/L812. 8. 25. To R. from Hs/Rm. c. to Hs. STEERING 'V' SERIES. +8430 +457 With reference to the tests at present… | ||
| Scan66 | The effect of the vacuum feed on slow engine running. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. ORIGINAL EXPERIMENTAL REPORT. Expl. No. REF: Hs/AJL1/1.014. C 8. 25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. HY. c. to Wor. RE. VACUUM FEED.… | ||
| Scan67 | Modifications to the Autovac fuel system to improve engine running. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.L. EXPERIMENTAL REPORT. -2- Expl. No. REF Hs/AJL/L.G14.8.25. C Neither increasing nor decreasing the air space above the petrol level in the Autovac float… | ||
| Scan68 | Modified Autovac suction elbow designed to solve uneven engine running. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. ORIGINAL Expl. No. REF: Hs/AIL/LG13.8.25. C To R. from Hs. c. to CJ. BJ. c. to RG. R. c. to DA. BY. c. to Wor. x3579 AUTOVAC. MODIFIED… | ||
| Scan69 | Spring-loaded piston fitting designed to improve engine performance at low speeds. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF Hs/AJL/LG13.8.25. C to choke the mixture drawn into the induction pipe at low engine speeds (closed throttle), but does… | ||
| Scan72 | Forwarding a list of experiments on steering wobbles as instructed by Mr. Royce. | ||
| View original record | To EY. from DA. To Hs from DA. ORIGINAL DA/LG15.8.25. STEERING WOBBLES. X457/18430 Attached is a list of experiments Mr. Royce would like carried out on the question of steering wobbles. He instructs… | ||
| Scan73 | From Mr. Royce outlining experiments to investigate high-speed steering wobbles. | ||
| View original record | To Hs. from DA. BY. from DA. HIGH SPEED STEERING WOBBLES. Mr. Royce thinks several chassis should be utilised for these experiments, one atleast being a Silver Ghost so that the difference, as regards… | ||
| Scan74 | Experiment to stiffen a vehicle chassis by adding gussets and stay plates, comparing the Phantom and Silver Ghost models. | ||
| View original record | C existing Bring this as near the cross member as convenient clearing brake pedal. Gusset secured to frame by angle and bolts through web near the bottom flange thus :- The object of this is to very… | ||
| Scan75 | Continued discussion on wheel and tyre dynamics, including safe lean, wobbles, and weight balancing. | ||
| View original record | contd :- -3- (8) Taking a radius rod controlled (40/50 or Phantom) what is minimum safe lean for braking and good steering on corners at high speed. What effect has this minimum lean on high and low… | ||
| Scan76 | High speed steering wobbles and tests with a damped pendulum lever. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs./A.G.L/T.8:25. To R. from Hs. c. to C.J. BJ. c. to RG. A. c. to DA. BY. c. to Wor. HIGH SPEED STEERING WOBBLES. X457… | ||
| Scan77 | High-speed steering wobbles, their causes, and the effects of different tyre types. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. REF Hs/EAC/LG17.8.25. HIGH SPEED STEERING WOBBLES. We have been carrying out continuous experiments with regard to this phenomenon. Our… | ||
| Scan78 | High-speed wheel wobble and the effects of tyre pressure, wheel gather, and steering tube springs. | ||
| View original record | EXPERIMENTAL REPORT. -2- Expl. No. REF : Hs/Nu/LG17.8.25. transverse moment of inertia of the axle. In addition, the rotational moment of inertia of the balloon tyre and wheel is 15% less than the… | ||
| Scan79 | Analysis of high-speed vehicle wobble, detailing tests on springs, axle inertia, and weight distribution. | ||
| View original record | -3- when the car is wobbling the driver is hardly conscious of the fact as the shocks reach him in a very reduced form. The actual side steering tube springs we tried against standard were very weak… | ||
| Scan80 | High-speed steering wobbles on a Phantom car and the effects of varying tyre pressures. | ||
| View original record | To DA2 from Hs. c to R Hs/Rml/LG17.8.25. HIGH SPEED STEERING WOBBLES. +457 With reference to DA2/M14.8.25 - question 2. Herewith alterations of road speed at which wobbles occur made by varying tyre… | ||
| Scan81 | Test data table correlating tyre pressure with vehicle speed and handling characteristics. | ||
| View original record | Tyre press: lbs/sq." | ADVANCE M.P.H. | RETARD. M.P.H. | TOE IN. | WHEEL BALANCE. | PIVOT LEAN. .125"/.150" | REMARKS. 60 | 66 | 66 | 1/2" | 1 lb. out. | * | Not very violent, fairly easily… | ||
| Scan82 | Examination of sample distributor mouldings noting corrosion issues and Mr. Royce's remarks for a solution. | ||
| View original record | R.R. 235A (100 T) (S.H. 159, 11-8-20) G. 2800 MISC ORIGINAL o R TO EFC. FROM E. E2/M18. 8 . 25. Copy to CJ. [crossed out] " DY. [crossed out] " HS. [crossed out] X6257 X6690/1 X3199 EAC. BATTERY… | ||
| Scan83 | Investigating vibration caused by a metal airscrew on Condor III engines. | ||
| View original record | R.R. 493 (40 H) (SL 42 12-7-23). J.H. D. EXPERIMENTAL REPORT. COPIES TO: R.C.J B.J. WOR. By E. Da. E.R. P.W.OY. R.A. Expl. No. 44639 REF. Hs6/L01 8.8.25. OBJECT OF TEST. To investigate vibration… | ||
| Scan84 | Investigating excessive vibration caused by a Leitner-Watts metal airscrew on a Condor III engine. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Eg/TAG/L.G.S.8.25. METAL AIR SCREW. A complaint has been made from one of the Aerodromes about the excessive vibration… | ||
| Scan85 | Propeller testing, blade adjustment, and the possible causes of vibration. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/TAG/LMS.8.25. In the case of our tests we were very careful about the engine being perfectly level when adjusting… | ||
| Scan86 | Adjusting blade settings and pitch angles to resolve engine vibration. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF Hs/TAG/LG15.8.25. of one of the blades, an intermediate was struck, at which the engine ran as smoothly as could be… | ||
| Scan87 | Comparing the propeller hub and adjusting rod of a Leitner-Watts design to an in-house version. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. REF Hs/TAG/LG15.8.25, Points about the Propeller hub etc. The diagram of the propeller hub for a two-blade propeller as… | ||
| Scan88 | Issues with propeller measurement accuracy and dismantling difficulties due to inaccessible bolts. | ||
| View original record | R.R. 499A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -5- Expl. No. REF: Hs/TAG/LG15. 8.25. way apart for accurate measurements and any readings in between, say .5°, are only approximate. It… | ||
| Scan89 | Ascertaining the period of high-speed steering wobbles using a Chronograph. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. ORIGINAL. EXPERIMENTAL REPORT. Expl. No. REF: Hs/Bml/LGls. 8.25. c To R. from Hs. c. to C.J. EJ. c. to RG. E. c. to DA. EY. c. to Wor. HIGH SPEED STEERING… | ||
| Scan90 | Tests conducted to ascertain the cause of high-speed steering wobbles. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: He/Rm/L/T.S.8. 25. contact is set to measure everything over a certain small amplitude. On the record in question we… | ||
| Scan91 | Issues found with car 9-G-111 after a 2,500-mile run in France. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.L. ORIGINAL EXPERIMENTAL REPORT. Expl. No. REF Hs3/LG18. 8. 25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. EY. c. to Wor. SECRET 9-G-111 Y5840 We… | ||
| Scan92 | Chassis 9 G.III after 2,500 miles, detailing engine condition and performance. | ||
| View original record | Hotel de France. Chateauroux. Indre. France. GWH.2/Crn. 14.8.25. To: "Hs" From: G.W.Hancock Report on chassis 9 G.III. after 2,500 miles. ENGINE. Power. Good. Compressions even. Engine detonates… | ||
| Scan93 | Condition report on various vehicle components including controls, engine, and electrical systems. | ||
| View original record | - 2 - Controls. These have functioned O.K., and are in good condition. Inlet pipe to L.O.P. E. 51767. This is in good condition. Exhaust pipe & fittings to L.O.P. E. 51605. - locking device on exhaust… | ||
| Scan94 | Test and condition report for various vehicle components including the oil pump, ignition, bonnet, and steering. | ||
| View original record | - 3 - Oil pump. (New oil pump & casing to L.E.C. 2063.) Oil pump has worked satisfactorily. Oil relief valve enclosed in same - valve has been cleaned out twice, owing to loss of oil pressure. Nothing… | ||
| Scan95 | Inspection report detailing the condition of steering, axle, suspension, clutch, gearbox, and servo components. | ||
| View original record | - 4 - slack in nut & worm. The steering at slow speeds is light, and no wobbles have developed. At high speeds, on Moderate rough roads, there are slight wobbles. Also at times there are severe shocks… | ||
| Scan96 | Vehicle inspection report detailing the condition of various components including pedals, starter motor, axle, and brakes. | ||
| View original record | - 5 - Pedals, "D" type, to L.O.P. F.53506. Spring F.53534 fitted to brake pedal. These are O.K. Clutch pedal bearing is on the slack side. Stop fitted to foot brake pedal fouls rod when fully… | ||
| Scan97 | Condition report on various vehicle components after testing, noting performance and failures. | ||
| View original record | - 6 - Electrical cut-out has functioned O.K. The points are in a very good condition. Accumulator suspension. Temporary battery box & support to Drwg. F.53198. These are O.K. Exhaust silencer &… | ||
| Scan98 | High-speed steering wobbles, detailing measurements and observations on a Phantom car. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF:Hs/Rm1/LG19.8.25. ORIGINAL To R. from Hs/Rm. C. to OJ. C. to WO. C. to Ede. C. to H.J. HIGH SPEED STEERING WOBBLES. X457… | ||
| Scan99 | Arranging the collection of car 46-PK to fit a new worm steering and improve petrol consumption. | ||
| View original record | To R. From Hs. c. to CJ. BJ. c. to RG. H. c. to DA. BY. c. to Wor. ORIGINAL Hs13/LG20. 8. 25. 46-PK CAR. 48770 78430 We are arranging for a driver to call for 46-PK car the first thing on Monday… | ||
| Scan100 | Investigations into high-speed steering wobbles and potential solutions. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs12/LG20.8.25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to EA. BY. c. to Wor. HIGH SPEED STEERING WOBBLES. Y455 X.… | ||
| Scan101 | Servo rattle complaint for 20 HP cars with 4-wheel brakes. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. ORIGINAL Expl. No. REF Hs/L020. 8.25. X5940 V5370 To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. SECRET 20 HP. CAR… | ||
| Scan102 | Petrol tank vent faults for the New Phantom, recommending modification. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. ORIGINAL EXPERIMENTAL REPORT. Expl. No. REF: HsE/LC20.8.25. To R. From Hs. c. to CJ. AJ. c. to RG. E. c. to BY. DA. c. to Wor. NEW PHANTOM. 78460 PETROL TANK… | ||
| Scan103 | The condition of the 20 HP chassis 9-G-111 after a 10,000-mile test. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. ORIGINAL. Expl. No. REF: Hs7/LG20. 8. 25. C Vimptt EXPERIMENTAL REPORT. To R: from Hs. c. to CJ. BJ. c. to RG. E. c. to BY. DA. c. to Wor. SECRET. CONDITION… | ||
| Scan104 | The condition of chassis 9-G-111 after a 10,000-mile trial. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. COPY. Expl. No. REF: RHC2/EE24.7.25. CONDITION OF 9-G-111 CHASSIS AFTER 10,000 MILES. The condition of the above chassis after 10,000… | ||
| Scan105 | Cylinder wear measurements and valve conditions. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: RH62/BE24. 7.25. Cyl. contd :- -> there being no signs of water leak. Valve seats show signs of pocketing. Valve… | ||
| Scan106 | The condition of various vehicle components. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: RIC2/BE24.7.25. Inlet pipes and exhaust pipes. Condition O.K. Oil pump drive. Condition O.K. Carburetter. Condition… | ||
| Scan107 | The condition of various vehicle components. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. REF: W1C2/BR 24.7.25. Rear springs. Front shackle pin worn in spring eyes. Rear " " " " " Brake equalisers O.K. Dashboard… | ||
| Scan108 | The condition of a propeller shaft, radiator, and various gearbox components. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -5- Expl. No. REF: HIC2/BE24.7.25. It appears that the water gets through the centre ring of serrations and then drains into the innards… | ||
| Scan109 | The wear of a servo drive, motor, and selector fork mechanism. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -6- Expl. No. REF: HC2/BE24. 7. 25. driving shaft stood the test without exhibiting signs of wear. Servo drive and mechanism. The outer… | ||
| Scan110 | Suggesting an aluminium casting be fitted to prevent hot air and gas leakage into the body from an aperture by the change speed gate. | ||
| View original record | c To R. from Hs. c.c. to CJ. BJ. c.c. to RG. E. c.c. to DA. BY. c.c. to Wor. ORIGINAL Hs4/LC20. 8. 25. IMPROVED EAC. WITH SUBFRAME. X8320 X8770 On EAC. cars fitted with the new change speed and brake… | ||
| Scan111 | Incorrect positioning of the protective rail on a luggage grid. | ||
| View original record | To R. from Hs. c. to CH. BJ. c. to RG. E. c. to DA. BY. c. to Wor. ORIGINAL Hsc/LGM. 8. 25. R-R LUGGAGE GRID. 78400 We find that the rail to protect the body appears to be too far back. With the rail… | ||
| Scan112 | Sketch showing the relative position of the body and luggage grid on an 8EX car chassis with a Barker Saloon body. | ||
| View original record | SKETCH SHEWING RELATIVE POSITION OF BODY AND LUGGAGE GRID ON 8EX. CAR. CHASSIS FITTED WITH SUBFRAME BARKER SALOON BODY 21-8-25 114" TO DASH. BODYWORK SHOULD NOT PROJECT BEYOND THIS FITTED LINE. (SEE… | ||
| Scan113 | Tests conducted to resolve high-speed steering wobbles on Phantom and Silver Ghost cars. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rm2/LG21.8.25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. ORIGINAL HIGH SPEED STEERING WOBBLES.… | ||
| Scan114 | Investigating steering friction and wheel wobble on a 'Phantom' model. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/Nm2/LG21.6.25. C With 12 lbs. friction, the steering was not at all nice, high speed control of the car being bad… | ||
| Scan115 | The nature and causes of high-speed steering and wheel wobble. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. C -3- Expl. No. REF: Hs/Rm2/LG21.8.25. EXPERIMENTAL REPORT. causing a greater angular movement of the wheel than this. We cannot see why the period of the… | ||
| Scan116 | Analysing the causes and mechanics of criss-cross vibration and wheel wobble. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. REF Hs/Rm2/LG21. 6. 25. (1) The strength of the road springs. (2) Their distance apart. (3) The moment of inertia of the… | ||
| Scan117 | The measurement, amplitude, and hydraulic damping of vehicle axle wobble. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -5- Expl. No. REF: Hs/Rm2/LG21. 8.25. speed as 30 m.p.h. with a frequency of perhaps little over half that at which it started; which… | ||
| Scan118 | Page comparing wheel balance effects between the Silver Ghost and Phantom models. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. C EXPERIMENTAL REPORT. -6- Expl. No. REF: Hs/Rm2/LG21.8.25. the two cars we are using we find that roughly 1 lb. out of balance on each Silver Ghost wheel… | ||
| Scan119 | High-speed steering wobbles, comparing balloon tyres with high-pressure tyres and testing the effect of shock absorber adjustments. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. C EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rml/LG22.8.25. ORIGINAL HIGH SPEED STEERING WOBBLES. X457 X8430 To R; from Hs. c. to CJ. BJ. c. to RO. L. c. to DA.… | ||
| Scan120 | Extract concerning water overheating on a 9-G-111 car during a test run in France. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF Hs7/LG24.8.25. C ORIGINAL To R. from Hs. c. to CJ. HJ. c. to RU. SY. c. to DA. HY. c. to EP. Wor. WATER OVERHEATING. X766… | ||
| Scan121 | High-speed steering wobbles observed in cars fitted with balloon tyres. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rm1/LG24. 8.25.C To R. from Hs./Rm. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. HIGH SPEED STEERING WOBBLES.… | ||
| Scan122 | The E.A.C. Carburetter, comparing the low-speed jet cone on the New Phantom with the Silver Ghost. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs4/LG24:8.25. ORIGINAL To R. from Hs. c. to CJ. BJ. c. to R2. E. c. to DA. EY. c. to Wor! E.A.C. CARBURETTER. Y6080 X2768… | ||
| Scan123 | Low-speed steering wobble in 20 HP cars fitted with 4-wheel brakes. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. ORIGINAL REF: Hs6/LG24.8.25. C X457 / X5430 To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. 20 HP. CAR… | ||
| Scan124 | Particulars of friction devices on 20 HP. pivots, with and without front wheel brakes. | ||
| View original record | COPY. C Hs/CAP/L620.8.25. PARTICULARS OF FRICTION DEVICES ON 20 HP. PIVOTS. G.11. PIVOTS (NO FRONT WHEEL BRAKES). No. of friction washers keyed to pivot pin = 3 " " " " " stub axle = 2 " " floating… | ||
| Scan125 | Steering issues, including lightness, wobble, and proposed solutions for chassis 9-G-111. | ||
| View original record | COPY: C Hotel de France, Chateauroux, Indre, France. GWH2/Crnll:8.9.25. To Hs. from G.W.Hancock. RE. CHASSIS 9-G-111. We have reported that the steering has become much lighter, also shocks on… | ||
| Scan126 | Tests conducted at Brooklands track with a 'V' series car. | ||
| View original record | R.R. 493 (40 H) (SL 42 12-7-23). J.H., D. ORIGINAL EXPERIMENTAL REPORT. COPIES TO: R.CJ. BJ. WOR. By. E. Da. EP. PN. OY. Expl. No. x 766 788 REF. Hs3/LG25. 8. 25. OBJECT OF TEST. TESTER. Tests on… | ||
| Scan127 | Car cooling tests conducted at Brooklands, focusing on ventilation and fan efficiency. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rm/LGS. 7. 25. BROOKLANDS TESTS. CAR COOLING TESTS. (a) Advantages to be gained from ventilation at high speeds. 70 M P… | ||
| Scan128 | Tests related to the fan drive and radiator shutter performance. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/Rm/LGS.7.25. Condition of Fan Drive. Top radiator temperature. Standard. 89°C Fan removed. 94°C Drive pulled… | ||
| Scan129 | Method of conducting car performance tests using a three-pen chronograph. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF. Hs2/LG25. 8. 25. X1725 XL630 To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. EY. c. to Wor. ORIGINAL METHOD OF… | ||
| Scan130 | The objections and applications of a testing instrument, particularly for braking tests. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: HsR/LG25.8.25. The main objection to this instrument is that the records have to be converted first to a velocity-time… | ||
| Scan131 | High-speed steering wobbles and tests with hydraulic damping. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. To R; from Hs. c. to CJ. BJ. c. to DA. RG. c. to E. BY. c. to Wor. Expl. No. REF: Hs/Rm2/LG25.8.25. ORIGINAL HIGH SPEED STEERING WOBBLES.… | ||
| Scan132 | Tests to eliminate high-speed steering wobbles with different tyre pressures and damping. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/Sm2/1/325.8.25. C TEST A. We found that without making the steering unduly heavy (8 to 10 lbs. at the steering… | ||
| Scan133 | Comparing wobble amplitude between balloon tyres and high pressure tyres. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF Hs/Rm2/LG25. 8.25. the wobble dies out. We carried out a test with the Chronograph to ascertain the respective… | ||
| Scan134 | Using glycerine as a hydraulic element and testing for car wobbles at speed. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. REF: Ha/Rm2/LG25.8.25. We are using glycerine as an hydraulic element which will give us a high viscosity and less… | ||
| Scan135 | 20 HP Dynamo, specifically investigating a 19 slot, 57 coil armature. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. 4121. X4610 REF H701/T26.8.25 To R. & E. from EFC. c. CJ. & PM. c. EY. Da. 20 HP. DYNAMO- 19 SLOT 57 COIL ARMATURE. Experiments… | ||
| Scan136 | Continuing the analysis of performance curves for standard and special armatures with varying air gaps. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. -2- EXPERIMENTAL REPORT. Contd. Expl. No. 4121 REF: EFC1/T26.9.25. The curves given are for a .015" air gap. Experiments have also been made on both standard… | ||
| Scan137 | Continuation comparing the performance of 19-slot armatures with standard ones. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. -3- EXPERIMENTAL REPORT. Contd. Expl. No. 4121 REF:FCL/T26.8.25. has been particularly good. Further points in connection with these tests are contained in… | ||
| Scan138 | Continuation detailing the performance of a 19-slot armature compared to a 29-slot design. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Contd. -4- Expl. No. 4121 REF: DYN/Tec.8.25. position than for the 9°, probably due to the use of a different carcase). In operation the… | ||
| Scan139 | Performance graph of a 20 HP dynamo showing output with various main brush positions and armature types. | ||
| View original record | AMPERE OUTPUT SCHEDULED OPERATING VOLTAGES OUTPUT of 20h.p. R DYNAMO WITH TWO & THREE COIL PER SLOT ARMATURES FOR VARIOUS MAIN BRUSH POSITIONS Two coils per slot (29 slots) 1. Main brushes 7°… | ||
| Scan140 | Blank document page with a red 'Print Room' stamp. | ||
| View original record | ROLLS-ROYCE, LIMITED PRINT ROOM. 28 AUG. 25. DERBY | ||
| Scan141 | Tests conducted to eliminate high-speed steering wobbles using hydraulic damping. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF Ha/Rm1/LG27.8.25. c To R. from Hs/Rm. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. ORIGINAL HIGH SPEED STEERING… | ||
| Scan142 | Shock absorbers, comparing standard models with hydraulic alternatives and testing their effect on tyre wobble. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. C EXPERIMENTAL REPORT. -2- Expl. No. REF: Ha/Rml/I.G27.8.25. The extent to which the riding of the car would be affected by these shock absorbers is difficult… | ||
| Scan143 | Testing wheel wobble caused by the synchronisation of out-of-balance front wheels. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: Hs/Rm1/LG27.8.25. We have proved by means of the Chronograph in connection with your suggestion that when both front… | ||
| Scan144 | Absence of designs for a damped pendulum lever and a cutout for the 20 HP cars. | ||
| View original record | To R. from Hs. c.c. to CJ. c.c. to BJ. c. to BM ORIGINAL 20 HP. CARS. V5770 Hs2/LG27.8.25. R5/M25.8.25. We have received no designs at Derby for the damped pendulum lever on the 20 HP., or larger dia.… | ||
| Scan145 | Petrol filters for 20 HP & 40/50 HP models, discussing issues with monel metal gauze and debris. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. ORIGINAL Expl. No. REF. HES/LG27.8.25. C To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. c. to H. PETROL FILTERS - 20… | ||
| Scan146 | Comparing petrol filter setups and issues across various car models. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF Hs3/LG27.8.25. C (1) Silver Ghost - 40/50 HP. Pressure feed, petrol filter only in tank. (2) 4-wheel brake 40/50.… | ||
| Scan147 | Design and specifications for petrol filters and rear fuel tanks. | ||
| View original record | R.R. 235A (100 T) (S.H. 159. 11-8-20) G. 2800 MISC ORIGINAL + R TO HS. FROM R. R1/M20.8.25. [Crossed out distribution list: G.H. C.J.B.D. T.N.H. E.T.D.A. R.C.D.T. H.M.L.T.] PETROL FILTERS, AND REAR… | ||
| Scan148 | Design, materials, and reliability of carburetter fuel filters. | ||
| View original record | R.R. 235A (100 T) (S.H. 159, 11-8-20) G. 2800 R (2) carburetter, which should be the same because it is only asked to pass already cleaned fuel. The gauze should be benzol (sulphur) proof - (monel… | ||
| Scan149 | Solutions for servo brake judder on 20.HP and 40/50 models, including changes to cams and adding a dash-pot. | ||
| View original record | Misc BRAKES + R ORIGINAL TO HS. FROM R. Copy to re. SERVO JAGGERS. 20.HP. AND 40/50. +8370 T5370 Apparently the less effective cams reduce the tendency for servo jaggers, but Hancock in France says… | ||
| Scan150 | The luggage grid, body guard position, and special brackets for different body lengths. | ||
| View original record | R.R. 235A (100 T) (S.H. 159, 11-8-20) G. 2800 ORIGINAL MISC R TO HS. FROM DA. DA1/M26.8.25. RR. LUGGAGE GRID. +sr/oo Replying to your HS6/LG21825., the position of the body guard which you shew on… | ||
| Scan151 | Staffing for aero engine work, confirming the engagement of an assistant with technical training. | ||
| View original record | To R. from Hs. c. to CJ. BJ. c. to RG. Wor. Hs6/LG28.8.25. edh AERO ENGINE WORK. (103) X1031 With reference to your suggestion contained in RL/M26.8.25. that special testers should be allotted for… | ||
| Scan152 | Summary of personal details, education, and experience for Arthur Alexander Rubbra. | ||
| View original record | C O P Y. RUBBRA, Arthur Alexander. Date of birth :- 29th. Oct. 1903. Education :- Northampton School 1915 to 1922. Left form U.6 - Prefect. University work :- Entered Faculty of Engineering of the… | ||
| Scan153 | Increasing the power of the Eagle engine. | ||
| View original record | R.R. 493 (40 H) (SL 42 12-7-23). J.H. D. EXPERIMENTAL REPORT. COPIES TO: RCJ, BJ, WOR, By. E. EP. BG Expl. No. 22437 REF. Hs7/LG28. 8. 25. OBJECT OF TEST. TESTER Increase power of Eagle engine; T.A.… | ||
| Scan154 | Power tests for the Eagle engine, comparing different configurations to increase power. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/TAG/LG26.8.25. EAGLE POWER TESTS. The object of the following tests was to obtain more power from an Eagle engine with… | ||
| Scan155 | Camshaft comparison between the Eagle Vlll and Eagle lX models. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/TAG/LG26.8.25. is fitted with Eagle lX. camshafts, which have 24° overlap, that there is a big increase in power… | ||
| Scan156 | Carburetter comparison tests for Eagle engines with different camshafts, pistons and compression ratios. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -3- Exptl. No. REF: Hs/TAG/LG26. 8.25. signs of flattening out. The increase at 2300 r.p.m. = 51 B.HP. CURVE III. CARBURETTER COMPARISON.… | ||
| Scan157 | Comparing carburettors and compression ratios on Eagle Vlll and Eagle IX engines. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. REF: Hs/TAG/LG26.8.25. As in the previous curve the 4 Eagle Vlll carbs. are predominant at low speeds up to 2200 r.p.m.… | ||
| Scan158 | Comparing engine power output based on different compression ratios and carburettor setups. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -5- Expl. No. REF Hs/TAG/LG26. 8. 25. With the 6.28 to 1 pistons the increase is very slight over the 6.09 to 1 at low speeds and up to… | ||
| Scan159 | Comparing the performance of Eagle VIII and Eagle IX engine carburetters, proposing future improvements and investigating valve bounce. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -6- Expl. No. REF: Hs/TAG/LG26.8.25. These curves bear out the characteristic shewn in the others, when the Eagle Vlll. carburetters are… | ||
| Scan160 | Engine testing, focusing on fuel mixtures and variations in compression ratios. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. -7- Expl. No. REF: Hs/TAG/LG26. 8. 25. EXPERIMENTAL REPORT. observed at all speeds. The engine ran quite comfortable at 2400 r.p.m. full throttle. GENERAL.… | ||
| Scan161 | The theoretical increase in power for a given increase in compression ratio. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/AR/LG28. 3.25. NOTE ON THEORETICAL INCREASE IN POWER FOR GIVEN INCREASE IN COMPRESSION RATIO. The theoretical increase… | ||
| Scan162 | Comparing B.M.E.P. and power curves for Condor and Eagle engines under different configurations. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/AR/LG28.S.25. (c) The Condor IV, B.M.E.P. curve follows the theoretical curve for Eagle IX. carbs. very closely. It… | ||
| Scan164 | Performance comparison graph for Eagle VIII and Eagle IX camshafts. | ||
| View original record | B.H.P. B.M.E.P. R.P.M. CURVE N° II CAMSHAFT COMPARISON CURVES COMPRESSION RATIO 5.27/1 A. EAGLE VIII CAMSHAFTS. INLET VALVE TIMING. T.D.C I.O. 10° I.C. 54° B. EAGLE IX CAMSHAFTS. INLET VALVE TIMING.… | ||
| Scan165 | Performance comparison graph for different carburetter setups, plotting B.HP and B.M.E.P. against R.P.M. | ||
| View original record | B.H.P. 430 420 410 400 390 380 370 360 350 340 1700 1800 1900 2000 2100 2200 2300 R. P. M. B.M.E.P. 130 120 110 CURVE No III CARBURETTER. COMPARISON CURVES. COMPRESSION RATIO 5.27/1 EAGLE IX CAMSHAFTS… | ||
| Scan166 | Performance comparison graph for different carburettor configurations, plotting B.HP and B.M.E.P. against R.P.M. | ||
| View original record | B.H.P. 450 440 430 420 410 400 390 380 370 360 350 B.M.E.P. 140 130 120 R.P.M. 1700 1800 1900 2000 2100 2200 2300 CURVE No. IV CARBURETTER COMPARISON CURVES COMPRESSION RATIO 6.09/1 EAGLE IX CAMSHAFTS… | ||
| Scan167 | Performance graph comparing different carburettor configurations, plotting Brake Horsepower and Brake Mean Effective Pressure against engine Revolutions Per Minute. | ||
| View original record | B.H.P. B.M.E.P. R.P.M. C D CURVE No V CARBURETTER. COMPARISON CURVES COMPRESSION RATIO 6.28/1. EAGLE IX CAMSHAFTS INLET VALVE TIMING I.O T.D.C. 14° I.C. 58° C EAGLE VIII CARBS. D EAGLE IX CARBS.… | ||
| Scan168 | Compression ratio comparison curves for the Eagle IX engine, plotting B.HP and B.M.E.P. against R.P.M. | ||
| View original record | B.H.P. R.P.M. B.M.E.P. CURVE Nọ II COMPRESSION RATIO COMPARISON CURVES E. COMPRESSION RATIO 5.27/1 F. " " 6.09/1 G. " " 6.28/1 EAGLE IX CAMSHAFTS INLET VALVE TIMING I.O. T.D.C. 14° I.C. 54° EAGLE IX… | ||
| Scan169 | Performance graph comparing engine BHP and B.M.E.P. at different RPMs for various compression ratios. | ||
| View original record | B.H.P. B.M.E.P. R.P.M. CURVE No VII COMPRESSED RATIO COMPARISON CURVES. E COMPRESSION RATIO 5.27/1 F COMPRESSION RATIO 6.09/1 G COMPRESSION RATIO 6.28/1 EAGLE IX CAMSHAFTS INLET VALVE TIMING I.O.… | ||
| Scan170 | Graph comparing engine performance curves for different carburettor and camshaft configurations. | ||
| View original record | B.H.P. B.M.E.P. R.P.M. C D CURVE NO VIII CARBURETTER COMPARISON CURVES. COMPRESSION RATIO 5.27/1. EAGLE VIII CAMSHAFTS. INLET VALVE TIMING. C EAGLE VIII CARBS. D EAGLE IX CARBS. CORRECTED FOR BAR. &… | ||
| Scan171 | Graph plotting actual and theoretical performance curves (BHP and BMEP vs RPM) for an Eagle IX engine. | ||
| View original record | B.H.P. B.M.E.P. R.P.M. 450 440 430 420 410 400 390 380 370 360 350 140 130 120 1700 1800 1900 2000 2100 2200 2300 C D CURVE No. IX ACTUAL & THEORETICAL CURVES COMPRESSION RATIO 6.09/1 EAGLE IX… | ||
| Scan173 | Proposing a visit to West Wittering to demonstrate experiments on a car with steering wobbles. | ||
| View original record | To. Mr. From Hs. c.c to Mr. HH. c.c to Mr. E. c.c to Mr. BA. EW. c.c to HoW. ORIGINAL. Hs5/LG28. 8.25. VISIT TO WEST WITTERING. X 1898 / X .457 We propose to visit WW. next week. Unless we hear that… | ||
| Scan174 | Tests on high-speed steering wobbles on an old-type axle. | ||
| View original record | To R: from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. EY. c. to Wor: ORIGINAL Hs8/LG28. 8. 25. HIGH SPEED STEERING WOBBLES. x457/x8430 We have carried out tests on a car on which the front steering… | ||
| Scan175 | The failure of 20 HP wing stays during a 10,000-mile test in France. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF. Hs2/LG29. 8:25. C To R. from Hs. c. to CJ. RJ. c. to WH. E. c. to DA. EY. c. to CWB. Wor. 20 HP. WING STAYS. X5740 X5390… | ||
| Scan176 | The failure of a rear spring on car 9-G-111 during a 10,000-mile test. | ||
| View original record | To R. from Hs. c.c. to CJ. BJ. c.c. to RG. E. c.c. to DA. EY. c.c. to Wor. a ORIGINAL Hs1/LG29.8.25. X5840 X5410 10,000 MILES TEST ON 9-G-111. We attach a copy of a report from Chateauroux giving… | ||
| Scan177 | Report from G.W. Hancock concerning a broken Near Side Rear spring on chassis 9-GIII. | ||
| View original record | Hotel de France, Chateauroux, Indre, France. C GWH/Cem. 27.8.25. To Hs. From G.W. Hancock. ---------------- Chassis 9-GIII. We have, on this morning's run, broken the N.S.R. spring. The top leaf has… | ||
| Scan178 | Theory on high-speed steering wobbles caused by conical precession and a proposal for a testing apparatus. | ||
| View original record | HS from DA DA 10 — 29.8.25 High Speed Steering Wobbles X457 / T8L+SO Mr Royce is anxious to prove if possible that the wobble set up is due to conical precession without torque, or with very little… | ||
| Scan179 | High-speed steering wobbles using an axle fitted with Michelin wheels. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. ORIGINAL REF Hs5/LG29.8.25. C Expl. No. EXPERIMENTAL REPORT. To R. from Hs. c. to CJ BJ. c. to RG. E. c. to DA. BY. c. to Wor. HIGH SPEED STEERING WOBBLES.… | ||
| Scan180 | The efficiency of a large diameter nut and worm for a steering system. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Ha/ACL1/LG31825 To R. from Ha/ACL. c. to C.J. R.J. c. to Hu. E. c. to N.A. BY. c. to Wor. STEERING. X8430 EFFICIENCY OF… | ||
| Scan181 | The efficiency and friction of a thread and nut under load, particularly regarding reverse efficiency. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hg/ACL1/L031825 rest with the thread under load and are as follows :- Actual μ starting from rest with the thread… | ||
| Scan182 | High-speed steering wobbles for a centre point axle fitted with disc wheels. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. Hs/REF/8031.8.25. C To R; from Hs./Rm. c.c. to CJ; B.J. c.c. to RG. E. c.c. to BA. EY. c.c. to Wor. ORIGINAL HIGH SPEED… | ||
| Scan183 | The effectiveness of hydraulic dampers for steering wobbles. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. ORIGINAL Expl. No. REF Ha1/LGL 9.9.25 To R. from Hs. c. to CJ. BJ. c. to RO. E. c. to DA. BY. c. to Wor. STEERING - HYDRAULIC DAMPERS.… | ||
| Scan184 | High-speed steering wobbles and the effects of out-of-centre wheels. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: H.S./L.32:6:25. To R. from Hs. c. to CJ. BJ. c. to RG. H. c. to DA. BY. c. to Wor. HIGH SPEED STEERING WOBBLES. 7457… | ||
| Scan185 | Observations from a test drive of a Lancia Lambda car, focusing on its suspension, steering, and wheel balancing. | ||
| View original record | To R. from Hs. c.c. to CJ. BJ. c.c. to RG. E. c.c. to DA. BY. c.c. to Wor. ORIGINAL Hs5/LG2. 9.25. c RE. LANCIA LAMBDA CAR. +4048 We shall be able to borrow locally one of these cars. We have been a… | ||
| Scan186 | Modifications to car 8-EX for a 10,000-mile test of the New Phantom in France. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.L). EXPERIMENTAL REPORT. Expl. No. REF: Hs3/LG3. 9. 25. C To BJ. from Hs. c. to CJ. c. to R. c. to Wor. By to BY. SECRET 10,000 MILES TEST IN FRANCE ON NEW… | ||
| Scan187 | High-speed steering wobbles. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. ORIGINAL Expl. No. ______ REF: HS/S/3/103. D.25 C To Rj from Hs. c. to C.J. B.J. c. to RG. E. c. to DA. EY. c. to Wor. HIGH SPEED… | ||
| Scan188 | High-speed wobbles and front axle vibration. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. 2 EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/Rm2/LGS.9.25. drastic alteration in the present standard design of the front of the car will be necessary to… | ||
| Scan189 | The causes of front axle wobble and methods for damping it. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. C EXPERIMENTAL REPORT. -3- Expl. No. REF: Hs/Bm2/LGS.9:25. It should be pointed out that a front axle will not start to vibrate in a criss cross manner… | ||
| Scan190 | The challenges of using damping in the steering system and axle to eliminate high-speed wobbles. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. _______ REF: Hs/Rm2/LG3 9.25. damping are :- (1) In the steering system. (2) On the axle. The amount of damping in (1) is… | ||
| Scan191 | Mechanical device designed to mitigate 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. REF: Ha/RmL/LG6.9.25. To R. from Ha./Rm. c. to CJ. BJ. c. to RQ. E. c. to DA. EY. c. to Wor. HIGH SPEED STEERING WOBBLES. +457… | ||
| Scan192 | Proposal for modifying a shock absorber with a torsional spring to act as an anti-wobbling device. | ||
| View original record | Contd :- -2- C 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 on which was a set up torsional spring so arranged… | ||
| Scan193 | Tests conducted to understand high-speed steering wobbles by adding weights to an axle. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. EY. c. to Wor. ORIGINAL Expl. No. REF Hs/Rm2/LG4.9.25. HIGH SPEED STEERING WOBBLES.… | ||
| Scan194 | Report on tests investigating a rattle from the 20 HP servo gears. | ||
| View original record | To R: From Hs. c. to CJ. BJ. c. to RH. E. c. to DA. BY. c. to Wor. ORIGINAL Hs4/L04.9.25. 20 HP. SERVO GEARS. x5370 x5340 We attach a report of tests carried out in France on 9-G-111 investigating the… | ||
| Scan195 | Servo gear rattling under various driving conditions. | ||
| View original record | R.R. 493A (30 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. COPY: Expl. No. REF: Hotel de France, Chateauroux, Indre, France. GWH2/Crn27.8.25. To Hs. From G.W.Hancock. **************** CHASSIS… | ||
| Scan196 | Continuation of a test report on the amount of damping required to stop a rattle. | ||
| View original record | contd :- -2- between the speeds of 47 to 40 m.p.h. Amount of damping required to stop rattle. We have not been able, and have not the applicances here, to give us the load applied to the drum on this… | ||
| Scan197 | Steering wobble tests conducted on a 20 HP car in France. | ||
| View original record | To R. from Hs. c.c. to CH. BJ. c.c. to RG. R. c.c. to DA. BY. c.c. to Wor. ORIGINAL C Hs5/LG4.9.25. X5840 X657 WOBBLES ON 20 HP. CAR. We attach a report of tests for steering wobbles carried out on… | ||
| Scan198 | Steering wobble tests conducted on chassis 9-C-111. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. COPY. Expl. No. REF: Hotel de France, Chateauroux, Indre, France. GWH/Crn 30.8.25. To H.S. From G.W.Hancock. **************** CHASSIS… | ||
| Scan199 | Wheel balancing and steering performance, noting tyre pressures. | ||
| View original record | contd :- -2- C 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 XXXXX tests were 40 lbs.… | ||
| Scan200 | The investigation of oil leaks from camshaft casings. | ||
| View original record | R.R. 493 (40 H) (SL 42 12-7-23). J.H., D. EXPERIMENTAL REPORT. COPIES TO: RCJ BJ WOR. By E Da. EP. PN. DY. RG Expl. No. 42598 44418 REF. Hs6/L.C4. 9:25. OBJECT OF TEST. Investigation of oil leaks from… | ||
| Scan201 | Oil leaks from the Condor 111 engine rocker box. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF. Hs/TAG/LG4.9.25. CONDOR 111: ROCKER BOX LEAKS. Trouble has been experienced with oil leaking from around the rockers of… | ||
| Scan202 | Blueprint showing a cross-section of a mechanical assembly with a handwritten note for a proposed modification. | ||
| View original record | THIS IS THE HOLE THAT IS PROPOSED TO STOP UP. | ||
| Scan203 | Blank document page with a red 'Print Room' stamp from the Derby factory. | ||
| View original record | ROLLS-ROYCE L.TED. PRINT ROOM 7 - SEP. 1925 DERBY. | ||
| Scan204 | Wire confirmation from Royce discussing gyrostatis wobble and precession in wheels. | ||
| View original record | ORIGINAL CONFIRMATION OF WIRE. COPY TO JH. HS. ✓ WEST WITTERING. 4. 9. 25. CLARKE. ROYCAR. DERBY. 4457 IS THERE SUCH A THING AS A GYROSTATIC WOBBLE AND CAN IT BE AT WHEEL SPEED WITH SUITABLE MOUNTING.… | ||
| Scan205 | Physics of front wheel wobble and gyroscopic effects. | ||
| View original record | To R. From EFC. c. to CJ. DA. C. Hs. ORIGINAL EFCs/14.9.25. C FRONT WHEEL WOBBLE. X457 In confirmation of our telephone conversation and in answer to your telegram, I am coming to Chichester with Hs.… | ||
| Scan206 | Continued analysis of wheel dynamics, discussing moments of inertia, conical oscillation, and precession. | ||
| View original record | Contd. - 2 - EFC3/T4.9.25. C 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… | ||
| Scan207 | Wheel precession, gyroscopic wobble, and conical oscillation. | ||
| View original record | Contd. -3- EFCF/24.9.25. C 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… | ||
| Scan208 | The final reports for the 10,000-mile test on the 'India' car in France. | ||
| View original record | To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. ORIGINAL Hs1/LG4.9:25: 10,000 MILES TEST ON 'INDIA' IN FRANCE. √5840 We attach final reports giving experimental road tests on… | ||
| Scan209 | Chassis after a 7,000-mile test in France, detailing engine condition. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: GWH/Crnl.9.25. Hotel de France, Chateauroux, Indre, France. To Hs. from G.W.Hancock ******************* REPORT ON CHASSIS… | ||
| Scan210 | Page 2 detailing engine component failures and observations. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. -2- Expl. No. REF: CMH/Gml.9.25. EXPERIMENTAL REPORT. and 18 to 23 m.ph. On the retard we reported one from 44 to 41 m.p.h. but as this is a period of servo… | ||
| Scan211 | The performance and issues of various vehicle components during testing. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: GML1/Cml.9.25. These we found to be the cause of the washer blowing out, the tightness of the studs at the base not… | ||
| Scan212 | The condition of various vehicle components after testing. | ||
| View original record | R.R. 493a (50 H) (D.D. 31, 12-6-25) J.H.L. EXPERIMENTAL REPORT. -4- Expl. No. REF WH1/Crnl.9.25. steady for some time, after which at low speeds pressure again drops. Battery ignition. We have had no… | ||
| Scan213 | The condition of steering, axle, suspension, and clutch components after testing. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -5- Expl. No. REF: CWM/CWL. 9.25. Steering column support on dash has remained O.K. Steering box supported on frame and engine -… | ||
| Scan214 | Wear and performance of various vehicle components after 5,000 miles. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -6- Expl. No. REF: GWH1/Crnl.9.25 No slipping has occurred. There has been a slight squeak occasionally from the clutch trunnion.… | ||
| Scan215 | Failures and wear on various vehicle components including suspension, drivetrain, and exhaust. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT -7- Expl. No. REF: GWII/Orm1.9.25. Rear road springs and shackle bearings. At 6,004 miles approx. the N.S.R. spring, top and 4th. leaves… | ||
| Scan216 | Component wear, breakages, and performance metrics from a vehicle test. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT -8- Expl. No. REF: GWH1/Crml.9.25. where pipe is joined to the silencer. Exhaust silencer and brackets. The lagging on silencer has now… | ||
| Scan217 | Summarizing failures during a 7,000 miles test for chassis 9-G-111. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: C CHASSIS 9-G-111. SUMMARY OF FAILURES DURING 7,000 MILES TEST CARRIED OUT FROM 8.8.25 to 30.8.25. | TESTED AT. | TOTAL… | ||
| Scan218 | The characteristics of high-speed steering wobble observed during a test of a Lambda Lancia car. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. ORIGINAL Expl. No. REF Hs1/LCS.9.25. C To. Mr. Froude. (Struck through) c. to Mr. O.J. (Struck through) c. to Mr. H. (Struck through) c.… | ||
| Scan219 | Vehicle's wobble and chassis distortion at speed. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REFal/LGX 9.25 C As far as we could see the whole chassis was twisting transversally about some point towards the rear of… | ||
| Scan220 | Engine and vehicle specifications. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. C EXPERIMENTAL REPORT. -3- Expl. No. REF: Hs1/LCS.9.25. Engine :- Bore 3" Stroke 4.67" Capacity 2.12 litres. Wheel base 10 ft 4½" Track 4 ft 5½" Direct drive… | ||
| Scan222 | High-speed steering wobbles in a Hispano Suiza car, comparing them to a 'Phantom'. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF Hs/RmS/LG10.9.25. C To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. HIGH SPEED STEERING WOBBLES. xu214… | ||
| Scan223 | Alteration to the pivot lean to address high speed steering wobbles. | ||
| View original record | C To. [redacted] c. to [redacted] c. to [redacted] c. to [redacted] c. to [redacted] ORIGINAL. Hs/RmA/LG10.9.25. 4457 x8436 HIGH SPEED WOBBLES. Alteration to pivot lean. We have altered the pivot lean… | ||
| Scan224 | The balance of road wheels and its effect on steering stability compared to other makes. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. ORIGINAL REF: Hs5/L010 9.25. c To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to EWE. DA. c. to Wor. BALANCE OF ROAD WHEELS.… | ||
| Scan225 | 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. REF: Hs/Rs2/LG10.9.25. Expl. No. C To R. from Hs/Sn. c. to CJ. BJ. c. to RG. E. c. to DA. EY. c. to Wor. LAMBDA LANCIA CAR. 44048 4457… | ||
| Scan226 | The necessity of wheel balancing, noting the shocks felt when the balance weights were removed. | ||
| View original record | C contd :- -2- (b) Wheel balance. The makers had taken the trouble to balance all the wheels on this car. We found that this was very necessary. The shocks on the steering were appreciable when we… | ||
| Scan227 | High-speed steering wobbles in Hispano and RR cars. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. ORIGINAL EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rm2/1/811. 9.25. C To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. EY. c. to Wor. HIGH SPEED STEERING… | ||
| Scan228 | Wear observed in the brake mechanism after a 10,000-mile test in France. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. ORIGINAL EXPERIMENTAL REPORT. REF: Hs10/LG11.9.25. Expl. No. To R! from Hs! c.c. to CJ. B.J. c.c. to RG. E. c.c. to DA. BY! c.c. to Wor. ----------------… | ||
| Scan229 | Acquiring and testing Derihon hydraulic shock absorbers as a potential alternative to the Houdaille model. | ||
| View original record | To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. ORIGINAL Hs4/LGH1.9.25. Handwritten: Y4046 X457 HYDRAULIC SHOCK ABSORBERS. We have seen a sample of the Derihon shock absorber and we… | ||
| Scan230 | The failure of the 20 HP steering tubular support and proposed improvements. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. ORIGINAL Expl. No. REF He1/LGil.9.25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. 20 HP. STEERING. Y 5430 X 5840… | ||
| Scan231 | Excessive wear on the Phantom radiator support and recommending an increase to the bearing surfaces. | ||
| View original record | To R. from Hs. c.c. to CJ. BJ. c.c. to RH. c.c. to DA. EY. c.c. to Wor. 'PHANTOM' RADIATOR SUPPORT. We find that we get excessive wear on the sphere supporting the radiator on the Phantom. The… | ||
| Scan232 | Issues with rusting and corrosion in the distributor head and proposed solutions involving increased ventilation. | ||
| View original record | To R. & E. from EFC. c. CJ. EY. EFC6./T11.9.25. ORIGINAL X.8691 - VENTILATION OF DISTRIBUTOR. Various bench tests have proved that the rusting of the steel parts and corrosion of the metal parts which… | ||
| Scan233 | Experimental sheet metal battery box for a 20 HP car after extensive road testing. | ||
| View original record | [STAMP: ORIGINAL] EWL absent. EFC/T14.9.25. To R. & E. from EFC. (Dictated 12.9.25) c.c. CJ. c. Ey. Wor. X.4378 - SHEET METAL BATTERY BOX FOR 20 HP. We have had running on a chassis an experimental… | ||
| Scan234 | Instructions regarding a metal battery box removed from chassis 69H after extended mileage. | ||
| View original record | RR 300 (20 Bks.) (SK 354 5-12-22 MP 264049) 108688 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: F.J.C. Order No.: Customer's No.: X4370 Date: 9-9-1925 Re: J.B.119 Re Metal Battery Box from 69H This battery… | ||
| Scan235 | Modifications for chassis 8-EX for a 10,000-mile test. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. ORIGINAL EXPERIMENTAL REPORT. Expl. No. REF: Hs2/LC14.9.25. C To a. Frommer. c. to CJ. BY. c. to RG. E. c. to DA. BY. c. to Wor. X8770 X8940 RE: CHASSIS 8-EX… | ||
| Scan236 | Page 2 of an experimental report listing vehicle modifications. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs2/LG/4.9.25. c X 15. Modified change speed mech: and side levers to LeC.2079 and N.sch. 1870/1903/2001. 16. Felt… | ||
| Scan237 | List of mechanical and electrical parts specifications, including carriers, rods, and ignition components. | ||
| View original record | -3- C 35. Off-side spare wheel carrier to N.sch.2023. Near 2015. 36. Front brake pull rods to N.sch.1780 ELECTRICAL PARTS. 37. Redmanol encased coil P.R.3. 38. Exide battery 6 RR5/1/2. 39.… | ||
| Scan238 | High-speed wobbles, comparing different car configurations and components. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rm1/LG14.9.25. C To R. from Hs./Rm. c.c. to CJ. BJ. c.c. to RG. E. c.c. to DA. BY. c.c. to Wor. ORIGINAL HIGH SPEED… | ||
| Scan239 | Tests and analysis on the causes of wheel wobble. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. C EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/Sml/L.014.9.25. advantage in going too far forward with the pivot lean, 5° giving as good results as 8° forward… | ||
| Scan240 | 20 HP road spring failures observed during a 10,000-mile test. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. ORIGINAL REF: H.S./G.M.T.9.9.25. To Rj from Hs. c. to C.J. B.J. c. to Rd. E. c. to DA. BY. c. to Wor. 20 HP. ROAD SPRINGS.+… | ||
| Scan242 | Investigating the causes of high-speed steering wobbles. | ||
| View original record | R.R. 493A 150 IT (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. To R. from Hs./Rn. c. to CJ. BJ. c. to RG. E. c. to DA. EY. c. to Wor. Expl. No. REF: HJS/MMB/L.2515. 9.25. HIGH SPEED STEERING WOBBLES.… | ||
| Scan243 | Investigating the causes of wheel wobble, specifically testing out-of-balance forces and balloon tyre deflection. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hm/Rm2/LG15.9.25. INDICATOR. we had anticipated from the movement with the wheels running slowly which appeared to be… | ||
| Scan244 | Tests conducted to understand and mitigate wheel wobble. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: Ha/Am2/LM15.9.25. we then poured water on the tyres, the wobbles instantly vanished completely. This was with… | ||
| Scan245 | The causes of vehicle wobble, focusing on tyre damping, tread patterns, and other contributing factors. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. C EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rm2/LG15.9.25. primary importance as they dictate the speed at which the wobble takes place. We believe the damping… | ||
| Scan246 | High-speed steering wobbles. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. ORIGINAL EXPERIMENTAL REPORT. Expl. No. REF: Hs/RM/LG15.9.25. To R. from Hs/Rm. c. to CJ. BJ. c. to RG. E. c. to DA. EY. c. to Wor. HIGH SPEED STEERING… | ||
| Scan247 | Investigations into front wheel wobble, axle modifications, and brake behavior. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. C EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/Bal/1G35.9. has been increased and increased in weight which would increase its transverse moment of inertia.… | ||
| Scan248 | Brief report on tests for high-speed steering wobbles using hydraulic dampers. | ||
| View original record | To R. from Hs. c. to CJ. RJ. c. to RG. E. c. to DA. BY. c. to Wor. ORIGINAL. Hs4/LG16.9.25. HIGH SPEED STEERING WOBBLES. f457/Test 30 We shall be sending you a full report on the tests carried out… | ||
| Scan249 | High-speed steering wobbles caused by tyres running out of truth. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rm/L.G16.9.25. C HIGH SPEED STEERING WOBBLES. +4565 / x457 To R. From Hs/Rm. c. to CJ. BJ. c. to RG. E. c. to DA. EY.… | ||
| Scan250 | Endurance run test of different types of connecting rod bearings. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/ACL/LG16.9.25. C To R. from Hs/ACL. c. to CJ. BJ. c. to RD. E. c. to DA. BY. c. to Wor. ORIGINAL EAC. CONNECTING ROD… | ||
| Scan251 | Reducing 'Phantom' exhaust noise using two types of modified silencers. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.L. EXPERIMENTAL REPORT. Expl. No. REF: Hs./1/1018.9.25. C ORIGINAL To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. SY. c. to Wor. 'PHANTOM' EXHAUST. 78230… | ||
| Scan252 | Two alternative silencer designs for the New Phantom model. | ||
| View original record | R.R. 498A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF He/ADL/LG/16.9.25. ALTERNATIVE SILENCERS FOR NEW PHANTOM. The following two silencers were made as alternatives to the… | ||
| Scan253 | Modifications to exhaust silencers, fish-tails and lagging. | ||
| View original record | EXPERIMENTAL REPORT. -2- Expl. No. The intermediate pipe (or cut out tube) is the same as standard with the exception that it is drilled at its rear end with 63 holes .312" dia. The second silencer… | ||
| Scan254 | Page discussing exhaust lagging and power losses from various silencers. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: Hs/AJL/L.C14.9.25. The addition of this gives no extra silence and tends to keep the exhaust gases hot at points… | ||
| Scan256 | Twisted front axle on a 20 HP car with 4-wheel brakes. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs2/LG16.9.25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. EY. c. to Wor. 20 HP. CAR FITTED WITH 4-WHEELBRAKES.… | ||
| Scan257 | Front axle (G.111 Type) that was handed in twisted after a chassis incident. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/TMW/LG16.9.25. C REPORT ON A FRONT AXLE (G.111 TYPE) HANDED TO US BY TEST DEPT. HAVING THE NEAR SIDE TWISTED. The… | ||
| Scan258 | Analysis of component damage resulting from a skid and impact with a bank. | ||
| View original record | contd :- -2- Hs/TMM/LG16.9.25. ----------------- oblique skid, combined with the solid effect produced with brake shoes hard on: that the blow, when tyre struck the bank, acting in the same direction,… | ||
| Scan259 | Blueprint showing the Brinell hardness test results and distortion on an axle. | ||
| View original record | FORWARD DIRECTION DRG: SHOWS 4°15' 4°7' 6°10' SHADED PORTION SHEWS WHERE DISTORTION OCCURED NEAR SIDE ROLLS-ROYCE LIMITED PRINT ROOM 16 SEP 1925 DERBY BRINELL OF AXLE 269 DRG: CALLS FOR 241-271 | ||
| Scan260 | Covering memo for a report on recent battery experiences and observations made with a Cadmium Electrode. | ||
| View original record | EFC. Absent. ORIGINAL. (Dictated 12.9.25) To R & E. CJ. Da. Wor. Hm. RG. EP. Mx. By. EFC2/T16.9.25. Recent experience on batteries of various kinds has led us to certain conclusions which, we feel,… | ||
| Scan261 | Technical note on the condition and maintenance of accumulator elements. | ||
| View original record | 15.9.25. ACCUMULATOR ELEMENT CONDITION. Prolonged experience with accumulators of various types has enabled us to arrive at certain conclusions leading to a rather more practical statement than is… | ||
| Scan262 | Battery cell charging issues, focusing on negative plates, overcharging, and maintaining potential difference. | ||
| View original record | Contd. -3- 15.9.25. If in any cell on charge the negatives do not gas as easily as soon as the positives, our experience indicates that at some time the battery has been wrongly treated in respect of… | ||
| Scan263 | The use and interpretation of a Cadmium Electrode for checking accumulator cell condition. | ||
| View original record | -3- Contd. Cadmium Electrode. The Cadmium Electrode is a useful laboratory device for showing up the electrical condition of the positive and negative elements. It is hardly suitable for the use of… | ||
| Scan264 | Page detailing the charging process of a cell, voltage readings, and the function of a cadmium electrode. | ||
| View original record | -4- Contd. wrong to some extent, the other must be on the right side to the same extent. In the process of charging a normally good cell, the positive element will gradually increase from 2.05 volts… | ||
| Scan265 | Comparative weights analysis of front axle components for various car models. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. To R. from Hs. c. to C.J. B.J. c. to R.V. E. c. to DA. BY c. to Wor. Expl. No. REF Hms/LGT.7.9.25. ORIGINAL COMPARATIVE WEIGHTS OF FRONT… | ||
| Scan266 | Comparing the weights of wheel and hub components for the Silver Ghost, New Phantom, and Hispano models. | ||
| View original record | R.R. 498A (50 H) (D.D. 31, 12-6-25) J.H.L. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs8/1/G17.9.25. C DESCRIPTION. SILVER GHOST. lbs. ozs. NEW PHANTOM. lbs. ozs. HISPANO. lbs. ozs. HUB - SHELL ONLY.… | ||
| Scan267 | The first flight tests of a direct-drive Condor IV engine in a Vickers Condor IV machine. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. ORIGINAL Expl. No. REF: Hs/TAG/1G17 9.25. To R.H. From Hs/TAG. c. to CJ. BJ. c. to RO. E. c. to Wor. FLIGHT TESTS ON DIRECT DRIVE CONDOR… | ||
| Scan268 | Engine, noting radiator issues, an oil leak, and modifications for Vickers and Hawker machines. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/TAG/L/G17.9.25. radiator (which is mounted just below the engine nose piece) is 3 ft. 6 ins. and the dia. of the… | ||
| Scan269 | The Eagle XV 2-speed gear. | ||
| View original record | R.R. 493 (40 H) (SL 42 12-7-23). J.H., D. ORIGINAL EXPERIMENTAL. REPORT. COPIES TO RCJ BJ. WOR By E. [Illegible] PN OY. RS Expl. No. 44627 REF. Hms/Ldl 7.9.25. OBJECT OF TEST. Eagle XV. 2-SPEED GEAR.… | ||
| Scan270 | Clutch plate wear in a 6-Eagle-XV 2-speed gear. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/AR/LG17.9.25. 6-EAGLE-XV - 2-SPEED GEAR. (1) CLUTCH PLATE WEAR. 6-Eagle-XV was submitted for test with the modified… | ||
| Scan271 | Clutch plate wear, adjustments following a test run, and gear case temperature. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hm/AR/LG1 7.9.25. to be fitted when the 'worn' position has been reached. If thicker adjusting plates are not… | ||
| Scan272 | Issues with gear changing and oil pressure in a scavenger pump system. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT -3- Expl. No. REF:- /AR/LGT.7.9.25. prevent rubbing. The fact that the engine is 3 H.P. down in power at 1800 r.p.m; supports this… | ||
| Scan273 | Oil pressures within a 2-speed gear operating cylinder during gear changes. | ||
| View original record | R.R. 493a (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3a- Expl. No. REF:- AR/LG.17.9.25. was therefore fitted to the pipe connecting the scavenger pump to the 2-speed gear operating… | ||
| Scan274 | Oil pressure in the operating cylinder and the sticking of the change speed valve. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. The pressure recorded with the valve in the REFd-position is no doubt due to the restricted port area, and the difference… | ||
| Scan275 | Valve sticking due to unbalanced pressure and a proposed solution. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.L. EXPERIMENTAL REPORT. -5- Expl. No. REF: Hs/AR/LG17.9.25. belief that the valve had been changed right over. Sticking is believed to be due to the unbalanced… | ||
| Scan276 | Blueprint diagram showing suggested modifications to a change-speed valve for an Eagle XV 2-speed gear. | ||
| View original record | EAGLE XV 2 SPEED GEAR (a) OIL ESCAPE (b) OIL ESCAPE Additional Bearing Surface FIG IV SUGGESTED MODIFICATIONS TO CHANGE-SPEED VALVE A.A.R. | ||
| Scan277 | Rough sketch showing a plan view of ports in the operating chamber for an Eagle XX & Speed Gear. | ||
| View original record | EAGLE XX & SPEED GEAR ROUGH SKETCH SHEWING PLAN VIEW OF PORTS IN THE OPERATING CHAMBER. Fig. I A, B, C & D ARE THE PORTS, E = THE PISTON, PORTS B & C ARE CRESCENT SHAPED DUE TO BEING CAST ON AN ANGLE,… | ||
| Scan278 | Blank document page with a Print Room receipt stamp. | ||
| View original record | ROLLS-ROYCE LIMITED. PRINT ROOM 17 SEP. 1925 DERBY | ||
| Scan279 | The Phantom 4-wheel braking distribution and performance. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. ORIGINAL Expl. No. REF: Hs2/LG17.9.25. To R. From Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. PHANTOM - 4-WHEEL BRAKING.… | ||
| Scan280 | Cars and their modifications for a visit to West Wittering. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. ORIGINAL EXPERIMENTAL REPORT. Expl. No. REF: Hs3/LG17.9.25. C X1698 X.8940a To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. EY. c. to Wor. RE: VISIT TO… | ||
| Scan281 | The cause of high-speed steering wobble. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. C ORIGINAL EXPERIMENTAL REPORT. Expl. No. REF Hs/Rm2/1.GMS.9.25. To R. from Hs./Rm. c. to CJ. BJ. c. to RG. E. c. to DA. EY! c. to Wor. xS420 ✓457 x.S820… | ||
| Scan282 | Tests and observations on wheel wobble. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.L. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/Em2/L/G.S. 9.25. (4) Out of balance in the proportions likely to be met with in practice is quite incapable of… | ||
| Scan283 | Analysing the causes of wheel wobble and its relationship to toe-in/out and axle dynamics. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF:Hs/Ru2/LG1S.9.25 -3- (7) When the wheels are given an excess of toe in the wobbles become worse - when a toe out, they… | ||
| Scan284 | Page analysing the self-exciting nature of high-speed wheel wobble. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-8-25) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. REF: Ha/Rm2/LG18.8.25. C the wheel manage to give the axle a minute criss cross movement. This little movement is… | ||
| Scan285 | Analyzing the gyroscopic effects on axle movement and wheel wobble. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -5- Expl. No. REF: Hm/Rm2/LG18.9.25. C period of the axle because it is most difficult to make the axle tramp at any other than its… | ||
| Scan286 | Continued page discussing the minimisation of road reaction during high-speed wobbling. | ||
| View original record | C contd :- -6- Hs/Rm2/LG1 8.9.25. ******************** between the tyre and the road so as to minimise the road reaction when high speed wobbling. Hs/Wm. | ||
| Scan287 | Comparing a standard induction system with an experimental small diameter aluminium induction pipe and water heated hot spot. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. ORIGINAL. EXPERIMENTAL REPORT. Expl. No. REF: Hs/ACL/2/LG 8.9.25. C 48070 48230 To R. from Hs/ACL. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor.… | ||
| Scan288 | Tests with a new cylinder head and sparking plug position. | ||
| View original record | R.R. 493 (40 H) (SL 42 12-7-23). J.H., D. ORIGINAL EXPERIMENTAL REPORT. COPIES TO: R.CJ. BJ. WOR. By. E. Da. EP. PN. OY. Expl. No. X.8050 (struck through) X.928 REF. Hs4/Ld18.9.25. OBJECT OF TEST.… | ||
| Scan289 | EAC engine with opposed sparking plugs and induction pipe in the cylinder head. | ||
| View original record | R.R. 498A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/ACL/C.G.9.25. C EAC. ENGINE WITH OPPOSED SPARKING PLUGS AND INDUCTION PIPE IN CYLINDER HEAD. (Cat.1875). The following… | ||
| Scan290 | Page detailing tests on induction systems, water jacket temperatures, and their effects on engine power and detonation. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. C EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/ACL/LGS.9.25. than either the jacketed pipe or the jacketed pipe and hot spot combined. In view of the… | ||
| Scan291 | Investigating engine ignition timing, detonation, and spark plug positioning. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-8-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: Hs/ACL/A/M.S. 9.25. the engine gave signs of late ignition when the magneto was switched off and engine was running… | ||
| Scan292 | Ignition systems, comparing single and dual ignition efficiency and its effect on detonation. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. REF: Hs/ACL/LGM 8.9.25. The ignition curves show that the plugs on the exhaust pipe side of the engine require more… | ||
| Scan294 | Graph plotting Brake Horse Power against R.P.M. to compare different induction systems. | ||
| View original record | INDUCTION SYSTEM COMPARISONS. 2 23-7-25. ENG. WITH OPPOSED SPARKING PLUGS (NO 10 SPECIAL) AND STANDARD ENGINES. NO 10 E.A.C. SPECIAL BOTH TESTS WITH SHORT OPEN EXH. PIPES TO EACH PORT & JACKET WATER… | ||
| Scan295 | Graph of ignition advance curves against RPM for a single cylinder engine with a 5.2:1 compression ratio, showing conditions for max torque and no detonation. | ||
| View original record | 3 BOTH IGNITIONS IN OPERATION. SINGLE CYL. 5.2 TO 1 COMP. RATIO. ADVANCE REQ. FOR MAX TORQUE ALSO ADV REQ. FOR NO DETONATION. THE LETTERS ON CURVES INDICATE THE IGNS. TO WHICH THEY REFER. A B FIRING… | ||
| Scan296 | Graph of ignition firing position against engine RPM for a single-cylinder engine with a 5.2 to 1 compression ratio. | ||
| View original record | 4 IGNITIONS USED SINGLY. SINGLE CYL 5.2 TO 1. RATIO. FIRING POSITION. DEGREES OF CRANKSHAFT. 40° 30° 20° 10° TOP. CENTRE. 0° -10° R.P.M. 250 500 750 1000 1250 MAX TORQUE B A NO DETONATION WITH NO… | ||
| Scan297 | Largely blank document page with a red 'Print Room' stamp. | ||
| View original record | ROLLS-ROYCE LIMITED. PRINT ROOM 19 AUG. 1925 DERBY. | ||
| Scan298 | The status of instructions received for the Eagle XVI engine components. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs:/LCTB.9.25. To R. From Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. RE. EAGLE XVI. +4114 We give below the… | ||
| Scan299 | 'Silver Ghost' steering, arguing for the necessity of wheel balancing to prevent high-speed wobbles. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs1/LGH.9.25. C To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. EY. c. to Wor. 'SILVER GHOST' STEERING. X9430 X457 We… | ||
| Scan300 | High-speed steering wobble issues on 40/50 HP cars. | ||
| View original record | C COPY. N-W Wor. from Br. Br1/H20.5.25. RE. HIGH SPEED STEERING WOBBLES ON 40/50 HP. We have recently received a fair number of complaints concerning the above trouble on 40/50 HP. cars which are… | ||
| Scan301 | Experiments on materials for H.T. distributor sparking points. | ||
| View original record | To R. from EFC. c. CJ. HY. EFC6/T22.9.25. RE H.T. DISTRIBUTOR. Answering your R3/M15.9.25, experiments on distributor sparking points of various materials were made on the old 40/50 battery ignition… | ||
| Scan302 | Ignition system ventilation issues, comparing climates and component materials. | ||
| View original record | Contd. -2- EFC/T22.9.25. in which it occurred with us, to insufficient ventilation. We feel that there must be something in the moister climate of this country as compared with America, so that… | ||
| Scan303 | Test report comparing a standard distributor head with one modified with holes for extra ventilation. | ||
| View original record | COPY EFC. WB.30. 11th July, 1925. DISTRIBUTOR HEAD WITH SIX 1/16" HOLES DRILLED IN THE TOP TO PROVIDE EXTRA VENTILATION. Comparative tests carried out on the bench rig with a drilled head and a… | ||
| Scan304 | 10,000-mile bench test of a standard contact breaker and distributor. | ||
| View original record | EFC. WB.33. July 22nd. 1925. X.8690. 10,000 MILE BENCH TEST OF STANDARD CONTACT BREAKER AND DISTRIBUTOR. The above test has been carried out on a standard EAC. distributor for the purposes of… | ||
| Scan305 | 10,000-mile test of a standard distributor and platinum points, including effects of ventilation on corrosion. | ||
| View original record | EFC. WB.40. 4.9.25. 10,000 MILE TEST OF STANDARD DISTRIBUTOR AND PLATINUM POINTS WITH COIL GP1 (REDUCED GAUGE OF PRIMARY). The condition of the platinum points after this run was considered to be… | ||
| Scan306 | The experimental testing of Redmanol encased battery ignition coils on various chassis. | ||
| View original record | To R & E. from EFC. c. CJ. Wor. c. By. RG. c. Da. Wd. EFC2/T23.9.25. ORIGINAL X.4079b - REDMANOL ENCASED BATTERY IGNITION COILS. X.8711. Refs. of previous reports :- EFC1/T14.10.24. EFC3/T4.5.25.… | ||
| Scan307 | Comparing Redmanol coil cases to stabalite ones, noting cost and quality differences. | ||
| View original record | Contd. -2- EFC2/T23.9.25. take place perfectly; the material of the moulded piece being therefore dielectrically and mechanically unsound. Redmanol coil cases could be made here at a much less cost… | ||
| Scan308 | Comparing the weight of a standard Dunlop wheel with a new Dunlop well-based wheel. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. ORIGINAL EXPERIMENTAL REPORT. Expl. No. REF: Hs3/1325.9.25. C To R. from Hs. c. to CJ. EJ. c. to RS. R. c. to DA. BY. c. to Wor. DUNLOP WHEELS. X3725 / X457… | ||
| Scan309 | Steering complaint on a 20 HP car, detailing axle specifications. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. ORIGINAL EXPERIMENTAL REPORT. Expl. No. REF6/L.G26.9.25. To R. from Hs. c. to CJ. BJ. c. to EY. Wor. 20 HP. STEERING. X.4664 X5243D Y4118 With reference to… | ||
| Scan310 | Comparing the performance of Derihon, Houdaillle, and Berkshire hydraulic shock absorbers. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.I. ORIGINAL REF: Hs/RM/A/1026.9.25. C EXPERIMENTAL REPORT. Expl. No. To R. from Hs/RM. c. to CJ. RJ. c. to RG. R. c. to DA. BY. c. to Wor. HYDRAULIC SHOCK… | ||
| Scan311 | Page on shock absorber testing, noting issues with lost movement and wobbles. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: W/Rms/L.2665.9.25. They both developed a certain amount of lost movement however possibly due to air getting in the… | ||
| Scan312 | Tests conducted to understand and mitigate high-speed steering wobbles. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. To R. from Hs/Rm. c. to CJ. EJ. c. to RG. E. c. to DA. BY. c. to Wor. Expl. No. ORIGINAL. HIGH SPEED STEERING WOBBLES. We have carried… | ||
| Scan313 | Continued discussion on the design and mechanics of an equalised braking system. | ||
| View original record | contd :- -2- C driver's point of view, to a perfectly equalised pair of brakes on an axle which could be made to assume a forward pivot lean whenever the brakes were applied. Ha/Rm. | ||
| Scan314 | 10,000-mile test of a 'Phantom' car, detailing wheel and steering modifications. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. ORIGINAL Expl. No. REF: HsS/1/328.9.25. C +8940a x5725 +86450 [Strikethrough text of a distribution list] 8-EX. 10,000 MILES TEST ON… | ||
| Scan315 | High-speed steering wobble tests on a Silver Ghost fitted with a torque control front axle. | ||
| View original record | To R. from Hs. c.c. to CJ. BJ. c.c. to RG. E. c.c. to DA. EY. Wor. ORIGINAL Hs/Rm/L628.9.25. HIGH SPEED STEERING WOBBLES. 4457 X8420 With reference to DAB/M23.9.25. We have tried a car fitted with the… | ||
| Scan316 | Addressing over-oiling issues in the 'Phantom' engine by modifying the rockers. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs./1098.9.25. C To R. from Hs. c.c. to CJ. BJ. c.c. to RG. E. c.c. to BA. EY. c.c. to EP. Mx. c. to Wor. ORIGINAL… | ||
| Scan317 | Tests conducted on connecting rod big end bearings. | ||
| View original record | R.R. 493 (40 H) (SL 42 12-7-23). J.H. D. ORIGINAL EXPERIMENTAL REPORT. C COPIES TO: R.C.J. BJ. WOR. By. E. Da. EP. PN. OY. Expl. No. X8030 REF. Hss/L626.9.25. OBJECT OF TEST. TESTER. Tests on… | ||
| Scan318 | 22.5-hour test of loose white metal lined connecting rod bearings. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: HS/AEM/1339.9.25. C E.A.C. CONNECTING ROD BEARINGS - LOOSE WHITE METAL LINED BUSHES. We have just completed a 22½ hrs.… | ||
| Scan319 | Cylinder block travel relative to the crankshaft and the performance of loose bushes. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT Expl. No. REF: Hm/ACL/Ldse. 9.25. Travel of cyl. block relative to crankshaft due to crankcase expansion. Evidence of thrust on this face… | ||
| Scan320 | Twisted front axle found after a 10,000-mile test in France. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. ORIGINAL Expl. No. REF: Hs8/1/C23.2.25. X 5840 X 5420 To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. 9-G-111. 10,000… | ||
| Scan321 | Technical drawing illustrating the distortion and Brinell hardness of a front axle, showing off-side and near-side views. | ||
| View original record | OFF SIDE NEAR SIDE SHADED PORTION SHOWS WHERE DISTORTION OCCURRED FRONT OF AXLE BRINELL, OFF SIDE. 241, 255, 255. DRAWING CALLS FOR 241 TO 271 VIEW IN DIRECTION OF ARROW 'A' FORWARD TWIST C OF AXLE… | ||
| Scan322 | Tests conducted on an aero engine petrol pump. | ||
| View original record | R.R. 493 (40 H) (SL 42 12-7-23). J.H., D. ORIGINAL EXPERIMENTAL REPORT. COPIES TO: (R)(CJ)(BJ)(WOR)(By)(E)(DA)(EP) PNMOYR (RG) Expl. No. 7409 / X4535 REF. Hs3/LG29.9.25. OBJECT OF TEST. Tests on R-R… | ||
| Scan323 | The testing and troubleshooting of a petrol pump, part number E.25588. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: HS/AR/LG29.9.25. R-R PETROL PUMP - E.25588. A new type R-R petrol pump was submitted for test on 4-C-4 on the hangar. Its… | ||
| Scan324 | Petrol pump performance, testing relief valve leakage and delivery rates at various speeds. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF Ms/AR/LG29.9.25. relief valve to be observed directly. The suction and bye-pass holes were then plugged up and the… | ||
| Scan325 | Comparing the performance of a pump against an R.A.E. type pump. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: Hs/AR/LG29.9.25. Volume of oil passed in 2 hrs. = .625 pts., giving .312 p.p.hr. Comparison with R.A.E. Pump. Figures… | ||
| Scan326 | Investigations into high-speed steering wobbles and the effect of castoring angle. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF Ha/Rm1/L029.9.25. To R. from Ha/Rm. c.c. to C.J. B. c.c. to RG. E. c.c. to DA. EY. c.c. to Wor. HIGH SPEED STEERING… | ||
| Scan327 | High-speed steering wobble and tests on side steering tube components. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. C REF Hs/Rml/LG29.9.25. They attained a small amplitude which could be maintained at a fixed speed, but died out as soon… | ||
| Scan328 | Diagram comparing high-speed steering wobble with and without a connected side-steering tube. | ||
| View original record | HIGH SPEED STEERING WOBBLES [Drawing A] FRONT DUNLOP CORD A STANDARD PIVOT LEAN AND TOE-IN 7.25 BALLOON TYRES INFLATED 20 LBS/□" [Drawing B] FRONT B COMPARISON OF EFFECT OF REMOVING SIDE-STEERING TUBE… | ||