Rolls-Royce Archives
| Identifier | Entry | ||
| Scan0 | Investigating an audible 'knock' on Phantom chassis, suspected to be caused by inflexible pistons. | ||
| 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. X8040 X4190 REF. Hal/LG5.10.25. OBJECT OF TEST. Investigation of… | ||
| Scan1 | The investigation of piston knocks. | ||
| View original record | R.R. 498A (50 H) (D.D. 31, 12-6-25) J.H.L. Expl. No. REF: Hs/ACL/LGS.10.25. EXPERIMENTAL REPORT. PISTON KNOCKS. We have been troubled with what appeared to be piston knocks. The symptoms however are… | ||
| Scan2 | Investigating the cause of piston knock and testing different piston designs. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Ha/ACL/LG5.10.25. The knock, though to a much lesser degree, can be reproduced very simply by moving a piston… | ||
| Scan3 | Tests on piston clearance and splitting pistons to reduce noise and optimize skirt flexibility. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF:- ACL/LGS.10.25. Even with this increased clearance .003 to .004, there was no evidence of piston slap when cold. We… | ||
| Scan4 | Blueprint showing the grinding dimensions for experimental E.A.C. pistons. | ||
| View original record | GRINDING DIMENSIONS FOR EA. C PISTONS [EXPL] A 4.247 DIA -1 .750 +.050 4.247 DIA. -1 SECTN "AA" 41° 45' 41° 45' PRESS. & SPLIT SIDE GROUND CONCENTRIC FOR 1.550 OR 41°45' 1.550 4.230 DIA. -1 4.247 DIA.… | ||
| Scan5 | How out-of-truth tyres, particularly low-pressure balloon types, cause steering wobbles. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF Hs/Rm/2/L.G. 10.25. To R. from Hs./Rm. c. to CJ. BJ. c. to RC. E. c. to DA. EY. c. to EP. MX. c. to Wor. OUT-OF-TRUTH OF… | ||
| Scan6 | Page advising on tyre management to address car wobble, specifically for high-pressure tyres. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF:Hs/SmS/LG6.10.25. We suggest that the only feasible method of attacking the difficulty in practice is to change the… | ||
| Scan7 | High-speed steering wobble tests with different tyre types. | ||
| View original record | R.R. 493A (30 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. ______ REF Hs/Rnl/LG6.10.25. To R from Hs/Rn; c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. HIGH SPEED STEERING WOBBLES.… | ||
| Scan8 | Tests investigating wheel wobble, comparing different tyre and spring arrangements. | ||
| View original record | R.R. 493a (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/Rml/LGS.10.25. We send you figures taken by a pencil in the end of the hub which demonstrate the relative… | ||
| Scan9 | Comparison between two different types of tyre treads with technical specifications. | ||
| View original record | COMPARISON BETWEEN DIFFERENT TYRE TREADS. (L) 33x5" TYRES 36 LBS / □" GROUND TAPER 2 LBS OUT OF BALANCE PIVOT LEANS 8° BACK .250 TOE IN FRONT 33 x 5" TYRES (K) FRONT 33 x 5" FLAT TOPPED GROUND TYRE 2… | ||
| Scan10 | Diagrammatic study of balloon tyre contact patches under various test conditions and setups. | ||
| View original record | Top Section: (E) FRONT AS (A) BUT WITH SPRINGS ON INSIDE OF S.S. TUBE ONLY. Since found to be misleading. (B) O/S FRONT Middle Section: (D) FRONT N/S R.R. STD TYPE S.S. TUBE SOLID PIVOTS & TRACK AS… | ||
| Scan11 | Tests conducted to mitigate high-speed steering wobbles. | ||
| View original record | R.R. 498A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. ORIGINAL Expl. No. REF: Hs/Rm1/L.09.10.25. To R. from Hs/Rm c. to CJ. BJ. c. to RG. E. c. to DA. EY. c. to Wor. HIGH SPEED STEERING… | ||
| Scan12 | Endurance testing of a hydraulic device and investigating steering tube geometry to reduce wobbling. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF:Hs/Rm/LG9.10.25. We are testing these for endurance on the bumping rig, they would appear to be very much more… | ||
| Scan13 | Issues with the 'Phantom' gearbox where 1st and 2nd speeds disengage under power. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs5/109.10.25. ORIGINAL To R. from Hs. c.c. to CJ. BJ. c.c. to RG. E. c.c. to DA. EY. c.c. to Wor. 'PHANTOM' GEARBOX.… | ||
| Scan14 | Investigating flexibility in the servo operating mechanism to resolve 'jagger' issues on 'India' (X5370) and Phantom models. | ||
| View original record | ORIGINAL. To R. From Hs. c.c. to CJ. BJ. c.c. to RG. E. c.c. to DA. BY. c.c. to Wor. SERVO JAGGERS ON 'INDIA' X5370 X5370 We have carried out your suggestions of introducing flexibility between the… | ||
| Scan15 | High-speed wobbles and wheel shimmy, comparing internal findings with a translated paper from Michelin. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rml/LG10:10.25. To R; from Hs/Rm. c; to DA. c; to BJ. HIGH SPEED WOBBLES. MICHELIN TYPE COMPANY'S INVESTIGATIONS. 4457… | ||
| Scan16 | Page 2 of an experimental report discussing findings on vehicle wobbles, including tyre pressures and track width. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/Rm/LGLC.10.25. Their remarks on increasing the width of the track appear to be reasonable. We do not agree with… | ||
| Scan17 | Cover note regarding a report on high-speed steering wobbles and the circulation of its French translation. | ||
| View original record | To E. from Hs. To RH. * * To BY. * * To Wox. * * ORIGINAL Hs1/LG10.10.25. HIGH SPEED STEERING WOBBLES. +457 We attach copy of Hs/Rml/LG10.10:25! We have sent copies of the French translation mentioned… | ||
| Scan18 | High speed wobbles and Michelin's investigations into the phenomenon. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF Hs/Rml/LG10:10.25. To R. from Hs/Rm. c. to DA. c. to BJ. HIGH SPEED WOBBLES. MICHELIN TYPE COMPANY'S INVESTIGATIONS. Last… | ||
| Scan19 | Page 2, detailing findings on vehicle wobble, track width, and tyre pressures. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF He/Rm1/L.10.10.25. Their remarks on increasing the width of the track appear to be reasonable. We do not agree with… | ||
| Scan20 | Piston troubles and the need for a modified design for the 'Phantom'. | ||
| View original record | R.R. 493 (40 H) (SL 42 12-7-23). J.H., D. EXPERIMENTAL REPORT. COPIES TO: BCJ BJ WOR. By E Da EP. RG Expl. No. X 8040 T4190 REF. Hs4/LG12.10.25. OBJECT OF TEST. Piston troubles on 'Phantom'. TESTER.… | ||
| Scan21 | Piston knocks, detailing the theory that a flexible piston skirt is required for silent operation across various temperatures. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REFs//ACL/LG1C.10.25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. PISTON KNOCKS - E.A.C. Continuing our… | ||
| Scan22 | Testing standard pistons with modified skirt splits. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/ACL/LG10.10.2 were simply modifications of the standard and which gave us quite good results. They are as follows… | ||
| Scan23 | Piston modifications to improve skirt flexibility and reduce engine knocking. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF HS/AOL/LG10 10.25. which an attempt was made to make the skirt more flexible by cutting away the stiffening rib, which… | ||
| Scan24 | The B.H.B. self-adjusting piston as used on the Bentley during a 24-hour record. | ||
| 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/L.C10. 10.25. of the B.H.B. self-adjusting piston as used on the Bentley during the 24 hours record. We hope… | ||
| Scan25 | Composite and split-skirt piston designs for engines. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -5- Expl. No. REF Hs/ACL/LG10.10.25. be better suited to take the side thrust than the one we employed for our experiments and at the… | ||
| Scan26 | Blueprint drawing of a composite aluminium piston design. | ||
| View original record | COMPOSITE PISTON. [ALUM.] THESE PLATES COULD BE MADE QUITE FLEXIBLE AT THE ENDS INVERTED PLAN STEEL GUDGEON PIN CARRIER SEPARATE PRESSURE SKIRTS HEAD & SKIRT BOLTED TO STEEL GUDGEON PIN CARRIER.… | ||
| Scan27 | Blueprint drawing of a Silver Ghost piston that was trialled in 1915. | ||
| View original record | [ "SILVER GHOST PISTON.", "THIS PISTON WAS TRIED IN 1915.", "TURN 4.513 DIA PARALLEL", "4.155 DIA FOR ALL GROOVES +0 -10", "3.900", "4.500 DIA", ".175 RAD", "72°", ".175 RAD", ".225 ±5", "4.300",… | ||
| Scan28 | Blank pages with hole punches, possibly a divider or back sheet. | ||
| View original record | ", | ||
| Scan29 | Delay in the Phantom car's 10,000-mile test due to difficulties producing duralumin brake carrier plates. | ||
| View original record | To R. from Hs. c.c. to CJ. BJ. c.c. to RG. E. c.c. to DAV BY.✓ c.c. to Wor.✓ ORIGINAL Hs2/LG10.10.25. PHANTOM CAR FOR 10,000 MILES TEST. x8940a x 8420 There has been difficulty in producing one of the… | ||
| Scan30 | The performance of a Phantom car at Brooklands. | ||
| View original record | ORIGINAL EXPERIMENTAL REPORT. R.R. 493 (40 H) (SL 42 12-7-23). J.H., D. COPIES TO: R.CJ. BJ. WOR. By E. Da. EP. PN. OK. Expl. No. x2565 x788 x8770 REF. Hs3/L G12. 30/7 25. OBJECT OF TEST. Performance… | ||
| Scan31 | Performance tests, comparing the acceleration and top speed of a New Phantom against a Silver Ghost. | ||
| View original record | R.R. 498A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/Sml/LG12.10.25 E.A.C.J PERFORMANCE TESTS. These graphs are more or less self explanatory. The tests were carried out… | ||
| Scan32 | Comparing the performance of the Phantom and Silver Ghost models. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/Rm/L/GL2.10.25 up to this speed is almost entirely a matter of carburation, the carburation on the car tested was… | ||
| Scan33 | Blank document with two punch holes. | ||
| View original record | ", | ||
| Scan34 | Outlining the fundamental points for judging car performance. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: HS/PMP/LG/12.10.25 To R. from HxRm c. to CO. DJ. c. to Plt. CW D. c. to E.P. Mx. c. to Hm. Wor. FUNDAMENTALS OF CAR… | ||
| Scan35 | Vehicle acceleration concerning car weight, engine power, and axle ratio, illustrated with graphs. | ||
| View original record | R.R. 493A (50 H) (D.D. 3L 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: (1) ACCELERATION. (a) Direct drive - car weight. The acceleration of two cars which are otherwise exactly similar will… | ||
| Scan36 | Factors affecting vehicle performance, including tractive resistance, carburation, and flywheel inertia. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: the peak of the power curve. The shape of the torque curve of the engine must be taken into consideration when… | ||
| Scan37 | Comparing two engine torque curves and their effect on car acceleration performance. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. ______ REF: ______ xxxx automatically to 12 ft/sec², or 20%. Naturally, therefore a car noted for its top gear slow… | ||
| Scan38 | The fundamentals of car performance and methods for comparing efficiency. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. Continuation of REF Hs/Rm2/L/3121025. EXPERIMENTAL REPORT. ORIGINAL. Expl. No. To R. from Hs. c. to CJ. BJ. c. to PH. CWS. c. to EF.✓ MX.✓ c. to Jun.✓ Wor.✓… | ||
| Scan39 | Car performance, specifically wind resistance and hill climbing. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT -2- Expl. No. REF He/Rm2/LF121025 however, we should say that these factors can be disregarded. Wind resistance. As this increases as the… | ||
| Scan40 | Vehicle acceleration and hill-climbing capabilities. | ||
| View original record | R.R: 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF Hs/Rm2/LG121025 to acceleration capabilities. In every case when a car is said to be able to climb a hill of a certain… | ||
| Scan41 | With a graph showing the acceleration equivalent of hill climbing. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: He/Am2/LGL.21025. ACCELERATION EQUIVALENT OF HILL CLIMBING. ACCELERATION FT/SEC.² SURMOUNTABLE GRADIENT Torque curve, car… | ||
| Scan42 | High-speed performance, discussing wind resistance, exhaust systems, and streamlining with a performance graph. | ||
| View original record | R.R. 433A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -5- Expl. No. REF: Hm/Rm2/LG121025. Graph: Y-axis: Road Wheel H.P. X-axis: Road Speed M.P.H. AB = Loss in Max. Speed due to… | ||
| Scan43 | Gear ratios in relation to wind resistance and the fundamental laws of braking. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -6- Expl. No. REF Ho/Sm2/Ld121025 It is not generally realised that the outline of the car beneath the frame is of great importance with… | ||
| Scan44 | Factors affecting car braking, including the co-efficient of friction, weight of the car, and gradients. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -7- Expl. No. REF Hs/RmB/L.G.121025 the car behaves. The main deciding external factor is the co-efficient of friction between the tyre… | ||
| Scan45 | Page detailing the physics of vehicle retardation and braking distances under various conditions. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT -8- Expl. No. REF Hs/Rm2/LG121025 maximum retardation which will be the rate at which it could pull up on the level on the same surface… | ||
| Scan46 | Vehicle braking performance, including a graph of road speed vs. time to rest. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -9- Expl. No. REF: Hs/Rm2/LG121025 Graph: - Y-axis: ROAD SPEED M.P.H. - X-axis: MINIMUM TIME TO REST (SECS) - Line A: Dashed line - Line… | ||
| Scan47 | Two graphs illustrating braking performance, showing extra work due to rotating masses and retardation from windage. | ||
| View original record | Left Graph: EXTRA WORK BRAKES ARE DOING DUE TO ROTATING MASSES. GIVEN IN EQUIVALENT CAR DEC'N FT/SEC.². Y-Axis: ACTUAL CAR DECELERATION FT/SEC.². Line Labels: FLYWHEEL & WHEELS, FLYWHEEL - ONLY,… | ||
| Scan49 | Tests of a non-return valve in the 'Phantom' vacuum feed system to reduce engine fading. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF Hs/AJL/LGL3.10.25. To R. from Hs/AJL c. to C.J. B.J. c. to RG. E. c. to DA. BY. c. to Wor. ORIGINAL 'PHANTOM' VACUUM FEED.… | ||
| Scan50 | Objectionable exhaust noise on the Phantom chassis. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/AJL2/LG121025. To R. from Hs/AJL; c.c. to C.J. BJ; c.c. to RG. E; c.c. to DA. BY. c.c. to Wor. ORIGINAL RE: 'PHANTOM'… | ||
| Scan51 | Shortening an exhaust pipe to reduce noise, with comparative B.HP data. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/AJL.2/LG121025. shows a slight advantage but it is safe to state that there is no disadvantage, the slight… | ||
| Scan52 | Experiments to improve cutout contact points for a 20 HP chassis, seeking Mr. Royce's feedback. | ||
| View original record | To E. from EFC. EFC1/T13.10.25. X.4105A - CUTOUT CONTACT POINTS OF SPECIAL TYPE. We have various experiments in hand to improve the working of the cutout contact points, all of which include, where… | ||
| Scan53 | The performance of a 20 HP rear axle bevel pinion thrust bearing after a 10,000-mile test, recommending its adoption. | ||
| View original record | ORIGINAL. To: R. From: Hs. C. to: G.W.H. C. to: Ma. ✓ C. to: D.A. MK. ✓ C. to: Wcr. ✓ Hs3/LG13:10.25. X5350 V2507 20 HP. REAR AXLE BEVEL PINION THRUST BEARING. 9-G-111 car which recently ran 10,000… | ||
| Scan54 | Tests for 20 HP rear axle bevel pinion thrust bearings. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. COPY. Expl. No. REF: TESTS ON 20 HP. REAR AXLE BEVEL PINION THRUST. Comparative tests have been carried out with standard double thrust… | ||
| Scan55 | Various thrust bearing tests. | ||
| View original record | R.R. 493a (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: After the above tests the bearing was found to be in good condition but the float had increased to .003. This figure… | ||
| Scan56 | Preventing fumes from entering the car body on the Phantom and 20 HP models. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF : Hs10/LM14.10.25. ORIGINAL. To Mr. [REDACTED] c. to Mr. [REDACTED] c. to Mr. [REDACTED] c. to Mr. [REDACTED] c. to Wor.… | ||
| Scan57 | Experimental EAC.1 chassis and plan to complete it with standard parts. | ||
| View original record | To R. from Hs. c. to CJ. EJ. c. to RG. E. c. to DA. BY. c. to Wor. EAC.1 CHASSIS. +8920 There were several very important items on this chassis which we never completed. We understood from you that… | ||
| Scan58 | The build specifications for the EAC.1 'D' type chassis. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: 14.10.25. RE. EAC 1. We are building up EAC.1. 'D' type chassis to the following specification - Chassis No. will be… | ||
| Scan59 | Page detailing specifications for a gearbox, pedals, shafts, and other 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: 14.10.25. (9) GEARBOX. The original instructions was for a 3-speed gearbox to Lec.1677-9. Whilst the details for the… | ||
| Scan60 | Issues with the 'Phantom' 4-wheel brake equaliser link, causing thumping due to insufficient friction. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: HJS/BS.14.10.25. ORIGINAL To R. from Hs. c. to CJ. BJ. c. to RO. S. c. to DA. BY. c. to WCr. 'PHANTOM' 4-WHEEL BRAKES.… | ||
| Scan61 | Potential use of duralumin rockers and bearing caps for 'Phantom' weight reduction. | ||
| View original record | ORIGINAL To R: from Hs. c. to CJ. BJ. c. to E. BY. Hs2/LG15.10.25. RE. 'PHANTOM' WEIGHT. Y5840 X3805 Y8090 Bentley's are using duralumin rockers on both their models. It might be considered worth… | ||
| Scan62 | Cover memo for an attached list detailing work in progress within the Experimental Department. | ||
| View original record | ORIGINAL To R. } To CJ. } FROM HS. To Wor. } HS8/LG15.10.25. WORK IN PROGRESS IN EXPL: DEPT: x2917 Attached is a list of work in progress in the Experimental Dept. We are sending two copies to R. so… | ||
| Scan63 | The work in production for various vehicle components and projects. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF:S8/LG14.10.25. WORK IN PRODUCTION IN THE EXPL: DEPT: ORDER OF URGENCY EAC.1. ENGINE MOUNTED ON SUBFRAME. Instructions for… | ||
| Scan64 | Tasks with their order of urgency for various vehicle models. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF JHS8/L/G14:10.25 ORDER OF URGENCY NEW PHANTOM - contd :- VALVES. 2 Asbestos glands for valves. 9 Whitemetalled glands… | ||
| Scan65 | The development status and order of urgency for Condor, Eagle, and Falcon engines. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.B. EXPERIMENTAL REPORT. -3- Expl. No. REF:HS8/LC14.10.25. ORDER OF URGENCY. CONDOR. 1 C.111. ENGINE FOR 100 HRS. TEST. Standard Condor 111. engine with detail… | ||
| Scan66 | Tests in progress for the New Phantom model, ordered by urgency. | ||
| View original record | R.R. 498A (50 H) (D.D. 31, 12-6-25) J.H.L. EXPERIMENTAL REPORT. -1- Expl. No. REF: HES/LG 15.10.25. EXPERIMENTAL TESTS IN PROGRESS. ORDER OF URGENCY. NEW PHANTOM. 1 Over-oiling. 2 Piston knocks. 7… | ||
| Scan67 | Tests and improvements with an order of urgency for Goshawk, Condor, and Eagle models. | ||
| View original record | R.R. 498A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/J/C.14.10.25. ORDER OF URGENCY. GOSHAWK. 2 Tests to improve carburation. 5 Exhaust with cutout. 1 Means of… | ||
| Scan68 | List of principal electrical experimental work in hand, categorised by component and urgency. | ||
| View original record | EPC/T15.10.25. PRINCIPAL ELECTRICAL EXPERIMENTAL WORK IN HAND. ORDER OF URGENCY. AMMETER & BATTERY. 1. Elliott Ammeters. 2. Exide batteries with special types of grids. 3. P & R 20 MF batteries -… | ||
| Scan69 | Order of urgency list for modifications and investigations into dynamos, regulators, and starter motors. | ||
| View original record | Contd. -2- ORDER OF URGENCY GENERATOR & DISTRIBUTION 30 HP Dynamo. 1. Increased output with same heating. 2. Two special armatures. 3. Various special pole pieces. 4. B.L.I.C. electrolytic regulator,… | ||
| Scan70 | Weight reduction on the 'Phantom' model by favouring the short chassis over the long one. | ||
| View original record | EXPERIMENTAL REPORT. Expl. No. REF: Hs1/LG15.10.25. To R. from Hs. c. to CJ. BJ. c. to RG. H. c. to DA. EY. c. to Wor. ORIGINAL REDUCTION IN WEIGHT ON 'PHANTOM'. 48840 48770 Practically the whole of… | ||
| Scan71 | 'India' pivot pin bushes, discussing lubrication issues and suggesting design changes. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF Hsd./L/M15.10.25 ORIGINAL To R. From Hs. c. to CJ. BJ. c. to RG. E. c. to DA. EY. c. to Wor. 'INDIA' PIVOT PIN BUSHES.… | ||
| Scan72 | Blueprint showing the addition of friction washers to an axle assembly and modification of a nut. | ||
| View original record | ADDITION OF FRICTION WASHERS TO G.W. AXLE NOT. PLATE 44B FLATS THIS NUT IS REDUCED TO 'S17' CORNERS .005 CLEARANCE BUSH Ex861 PIN Ex862 BOLT Ex729 WASHER S.A. 15863 WASHER S/N F61889 WASHER Bz.PC.… | ||
| Scan73 | Duralumin brake carrier supply issues and front axle weight reduction for the 8-EX car. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs9/LG15.10.25. TO: From Hs: c. to CJ. DJ. c. to RG. E. c. to DA. DY. c. to Wox. ORIGINAL 8-EX CAR. 10,000 MILES IN… | ||
| Scan74 | Centralized chassis lubrication schemes, mentioning the Phantom car, Enots Lubricators, and a sample Bijur system. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. ORIGINAL EXPERIMENTAL REPORT. Expl. No. REF: Hs5/LG15.10.25. To R: from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. CHASSIS LUBRICATION. Y3806… | ||
| Scan75 | Testing and implementation of the Bijur chassis lubrication system. | ||
| View original record | To Hs. from CY. COPY. OY3-E-10625. RE. BIJUR CHASSIS LUBRICATION. You will have received already the reprints of Bijur's paper on his chassis lubrication system and possibly the demonstration set. We… | ||
| Scan76 | Centralized lubrication systems, their market adoption, and benefits for steering. | ||
| View original record | contd :- -2- GENERAL ADOPTION. The first car to adopt a centralized lubrication system was the Cleveland. This was the Bowen system, not nearly as well designed as the Bijur. Last year Packard came… | ||
| Scan77 | Lubricating the steering pivots for the Phantom model. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: HsX/EG15:10.25. ORIGINAL x S980 / K8430 To R. From Hs. c. to CJ. BJ. c. to RG. R. c. to DA. BY. c. to Wor. 'PHANTOM'… | ||
| Scan78 | Cross-section diagram of a lubricator with dimensional modification notes. | ||
| View original record | LUBRICATOR TO N. SCH: 1869 DUST COVER CUT AWAY IF NECCESSARY INCREASED TO 1.400 THIS SECTION REDUCED TO .075 ROLLS-ROYCE, LIMITED PRINT ROOM. 15 OCT 1925 DERBY. | ||
| Scan79 | The strength of the 'India' front axle. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rml/LG161025 ORIGINAL To R. from Hs. c. to CJ. BJ. c. to RQ. E. c. to DA. EY. c. to Wor.… | ||
| Scan80 | Torsion test results for a 20 HP front axle, showing load versus permanent set and deflection profile. | ||
| View original record | TORSION TEST OF 20 H.P. FRONT AXLE BOTTOM DATUM LINE TOP DATUM LINE LOAD APPLIED TENDS TO BEND AXLE THIS WAY PERMANENT SET [INCHES] DISTANCE FROM PIVOT CENTRE (TOP) DISTANCE FROM PIVOT CENTRE (BOTTOM)… | ||
| Scan82 | The New Phantom exhaust cutout, detailing issues with a weak spring causing leaky valves. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF Hs/AJL1/1.G161025. To R. from Hs. c.c. to CJ. BJ. c.c. to RQ. R. c.c. to DA. EY. c.i. to Wor. ORIGINAL NEW PHANTOM EXHAUST… | ||
| Scan83 | Oil flinging issues related to Goshawk universal joint lubrication. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. ORIGINAL Expl. No. REF: Hs/TMW/LG201025 To R. from Hs/TMW. c. to CJ. BJ. c. to DA. E. c. to BY. Wor. c. to EP. Mx. c. to Hn.… | ||
| Scan84 | Correcting oil leaks from a joint and exploring alternative lubrication methods. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/TMWL/LG201025 This has now been corrected. Assuming that there are no [text crossed out] leaks from these two… | ||
| Scan85 | Continued note on grease lubrication procedures for joints and intensifiers during testing and use. | ||
| View original record | contd :- -3- Hs/DMW/LG20.10.25! ******************* with thick grease when being erected (as is the present custom), the joints should have 5 of these charges inserted through lubricator before test,… | ||
| Scan86 | Comparing the performance of the new 6 1/2 Litre Bentley to the New Phantom. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.A.H.D. EXPERIMENTAL REPORT. ORIGINAL Expl. No. REF: Hs/Rm/L0231025 To R. from Hs/Rm c. to CJ. B.J. c. to RG. E. c. to DA. BY. c. to PH. Wor. c. to EP. CWB. NEW 6… | ||
| Scan87 | Comparing the performance specifications of the Phantom and Bentley against other contemporary cars. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/RM4/LG251025 140 clutch B.HP. available while the Phantom has only 109 B.HP. The increased efficiency at high… | ||
| Scan88 | Performance graph comparing Flywheel B.HP against Engine R.P.M. for a 'New Phantom' and a 'Bentley'. | ||
| View original record | FLYWHEEL B.H.P. 140 130 120 110 100 90 80 70 60 50 40 30 20 300 ENGINE R.P.M. 1000 1500 2000 2500 3000 BENTLEY New PHANTOM | ||
| Scan89 | Car road tests on a 40 HP Fiat and 19-HP Austro-Daimler, concluding against purchasing them. | ||
| View original record | ORIGINAL To R. from Hs. c. to CJ. BJ. c. to RG. BJ.✓ c. to DA. BY.✓ c. to FN. Wor.✓ c. to RP. OWB.✓ Hs5/LG23.10.25. CAR ROAD TESTS. X1056/X535 Attached herewith are reports in connection with the 40… | ||
| Scan90 | The road trial of a 40 HP Fiat. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT Expl. No. REF Hm/Rml/LG231025 ROAD TRIAL OF 40 HP. FIAT. (20.10.25) PARTICULARS OF CAR. Bore 3.35 - stroke 5.5" Displacement 4766 c.c's.… | ||
| Scan91 | Issues with tappet noise, gearbox operation, and clutch performance. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF JHa/RmL/LG231025 but on opening the bonnet two bad tappet knocks were noted, the valve gear being generally less… | ||
| Scan92 | The performance of the vehicle's brakes and steering systems. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF Hs/Rml/L0231025 The pedal pressure required to free the clutch was not excessive. BRAKES. The side brake was… | ||
| Scan93 | Car's steering, suspension, and road performance. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. REF: Ha/Rml/LG231025 this car is very good: We were informed by the chief Technical man that the steering was worm and… | ||
| Scan94 | Car performance, including acceleration tests on Brockley Hill and analysis of the engine and braking systems. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -5- Expl. No. REF Hs/Rml/LG231025 great difference to the performance of the car, because though the driver has applied for blanking… | ||
| Scan95 | Page 6 of an experimental report detailing vehicle test findings and general impressions. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -6- Expl. No. REF:Hs/Rm1/LG231025 and when closing the servo valve. The whole action gives a driver who is not used to the car a feeling… | ||
| Scan96 | Experimental road trial report for an Austro-Daimler car detailing its specifications and observed features. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rm2/LG231025 ROAD TRIAL - AUSTRO-DAIMLER CAR. (20.10.25) PARTICULARS OF CAR. Bore 71.5 - stroke 110. Displacement… | ||
| Scan97 | Assessing the performance of the camshaft, gearbox, clutch, and steering. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.L. EXPERIMENTAL REPORT. -2- Expl. No. REF Jls/Rm2/LG231Q25 Camshaft is held in three bearings and supplied with forced lubrication. The whole head of the cyl.… | ||
| Scan98 | The performance of a vehicle's steering, brakes, rear axle, suspension, and cooling system. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT -3- Expl. No. REF: Hm/Bm2/LG231025 but not heavy. Steering column did not seem very rigid and suffered badly from vibrations due to a… | ||
| Scan99 | The road performance and acceleration figures of a test car, including a comparison to a Phantom car. | ||
| View original record | R.R. 493a (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. REF Hs/Am2/10631025 ROAD PERFORMANCE. This is a very lively car. The engine is flexible, it being possible to remain in… | ||
| Scan100 | Comparing the performance of a 20 HP car against an Austro-Daimler, with a focus on engine efficiency. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.A.H.D. EXPERIMENTAL REPORT. -5- Expl. No. REF Hs/Rm2/LG231025 We obtained a both way reading for the max. speed of the car, this appeared to be 58 m.p.h.… | ||
| Scan101 | Engine silencing, weight saving and a performance comparison to a Chrysler. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -6- Expl. No. REF. Hs/Rm2/LG231025 The engine is very interesting as an example of what can be done in silencing an overhead camshaft,… | ||
| Scan102 | Investigating high speed steering wobbles by modifying leaf springs. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/RnS/LG231025 To R. from Hs/Rn. c. to CJ. BJ. c. to RG. E. c. to DA. EY. c. to Wor. HIGH SPEED STEERING WOBBLES. X457… | ||
| Scan103 | Interview with the President of the American Bosch Corporation regarding an automatic ignition advance mechanism. | ||
| View original record | To R. from EFC. "c. CJ. " BJ. c. By. c. Wor. ORIGINAL EFC2/T28.10.25. Y3779 INTERVIEW WITH MR. MURRAY - PRESIDENT OF THE AMERICAN BOSCH CORPORATION. I saw Mr. Murray at 12.15 p.m. at Conduit Street on… | ||
| Scan104 | Page 2 of a document describing a pressure-operated mechanism for engine ignition control. | ||
| View original record | Contd. -2- EFC2/T28.10.25. Instantaneous pressure from the main cylinder will then in principle be conducted to either side of the piston in the operating cylinder at pre-determined times, and the… | ||
| Scan105 | Automatic ignition adjustment principle based on cylinder working pressures. | ||
| View original record | EFC2/T28.10.25. -3- Contd. points again occurs. In this way, it is contended that the maximum working pressure in the cylinder is maintained at the most generally efficient instant in the stroke for… | ||
| Scan106 | Engine valve design, comparing poppet and rotary valves. | ||
| View original record | EFC2/T28.10.25. -4- Contd. not be more suitable and he thought the poppet was better for dealing with the gases. I said I thought that if Mr. Royce designed an apparatus on these lines he would… | ||
| Scan107 | The performance and testing of 'Lovejoy' hydraulic shock absorbers. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rn/A/G2220 25 ORIGINAL To R. from Hs/Rn. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. c. to OY 'LOVEJOY' SHOCK… | ||
| Scan108 | Blueprint drawing illustrating the failure points of a Lovejoy shock absorber after rig testing. | ||
| View original record | FAILURE OF LOVEJOY SHOCK ABSORBER DOWEL PIN LOCATION BROKEN HERE BEARING DISTORTED DOWEL PIN HOLE WORN OVAL AND DISTORTED BOTH SHOCK ABSORBERS FAILED AFTER 15.5 HOURS RUNNING ON BUMPING RIG. Stamped… | ||
| Scan109 | Dissatisfaction with the steering freeness on the 8-EX car, delaying a 10,000-mile test. | ||
| View original record | To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to BA. EY. c. to Wor. ORIGINAL Hs2/LG28.10.25. Hs. dictated but not seen. 18430 +8940a 8-EX CAR. We are not satisfied with the freeness of the steering on… | ||
| Scan110 | The braking performance of the Phantom model, discussing wheel lock and retardation. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. ORIGINAL EXPERIMENTAL REPORT. Expl. No. REF: [Text Struck Through] Hs/Rml/LG2.11.25. To DA. from Hs/Rm. PHANTOM BRAKING. 48220 With reference to… | ||
| Scan111 | Inspection and comparison report on a 12 Volt Delco-Remy ignition system. | ||
| View original record | To R & E. from EFC. c. CJ. Wor. c. Da. RG. c. BY. EFC/T3.11.25. X.4284 - DELCO-REMY IGNITION. 12 VOLT. We have recently received Delco-Remy equipment comprising one contact breaker and distributor… | ||
| Scan112 | Continued analysis of a ballast resistance and primary winding, comparing electrical properties and planning future tests. | ||
| View original record | Contd. -2- EFCL/T3.11.25. The resistance of the ballast resistance cold is 2.25 ohms, as against our .84, and in approx. normal running conditions is 2.75 ohms as against our 1.35. Cold resistance of… | ||
| Scan113 | Detailed report on the features of a Delco-Remy Distributor (Model 5249). | ||
| View original record | COPY. EFC. WB.51. 26th Oct. 1925. DELCO-REMY DISTRIBUTOR (MODEL 5249) This distributor which is fairly representative of American design has many interesting features. The general finish is good and… | ||
| Scan114 | Continued description of a Ballast Resistance and its integration with an automatic cam advance governor. | ||
| View original record | -2- Contd. (f) Ballast Resistance. This is wound on a porcelain insulator, protected by a metal casing, and is carried on the outside of the distributor casing. Its resistance cold is 2.24 ohms, and… | ||
| Scan115 | The electrical properties and performance of a Delco Coil No. 2178. | ||
| View original record | COPY. EFC/ WB.57. Nov. 2nd. 1925. DELCO COIL. No. 2178. This coil is unconventional to usual practice in the respect that it has a nearly closed iron core circuit. The windings, which are arranged… | ||
| Scan116 | Cover letter discussing notes on the Packard (Splitdorf) single machine double spark magneto. | ||
| View original record | ORIGINAL To R. } RG. } from EFC. c. CJ. c. HY. EFC5/T3.11.25. Attached please find copy of Notes regarding the Packard (Splitdorf) single machine double spark magneto, as mentioned in his letter to… | ||
| Scan117 | Notes regarding the Packard (Splitdorf) Double Spark Magneto system. | ||
| View original record | EFC4/T3.11.25. NOTES RE PACKARD (SPLITDORF) DOUBLE SPARK MAGNETO. (As described in Vol.XVI. No.3 of the Journal of the Society of Automotive Engineers, p.307, and diagram p.303). The circuit diagram… | ||
| Scan118 | Continued description of a duplicated ignition system's operation, focusing on contact breakers and spark generation. | ||
| View original record | Contd. -2- EFC4/T3.11.25. system, if one contact breaker fails by not making contact, the other one does duty. In the ordinary way, the later one to break does duty. In the present system, in addition… | ||
| Scan119 | Typed analysis of duplication in magneto systems, discussing various failure modes and advantages. | ||
| View original record | EFC4/T3.11.25. -3- Contd. taking the description as it stands, what the function of this impedance actually is, and it appears that there must be some error in the description. It appears that the… | ||
| Scan120 | Continued page discussing duplication against short-circuited contact breaker or condenser failure. | ||
| View original record | EFC4/T3.11.25. -4- Contd. N.B. Apparently it would not provide duplication against short circuited contact breaker or condenser failure, except by the opening of the corresponding switch. Therefore,… | ||
| Scan121 | Hand-drawn electrical connection diagram for a dual ignition system. | ||
| View original record | CONNECTION DIAGRAM. SW₂ SW₁ HT₁ S₁ P₁ C₁ CB₁ CB₂ P₂ S₂ C₂ HT₂ | ||
| Scan122 | The effect of pull-off spring strength on thumping in the New Phantom's 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/Rm2/LG4.11.25. To DA. from Hs/Rm. NEW PHANTOM - 4-WHEEL BRAKES. +S420 With reference to DA3/M22.10.25. We… | ||
| Scan123 | Cover note for a document about the balance of a 16-cylinder aero engine. | ||
| View original record | To R. from RFC. c. c. CJ. c. c. RG. c. c. BY. ORIGINAL EFC4/T9.11.28. Herewith a copy of Notes concerning the balance of the 16-cylinder aero engine. These refer only to the balance of the engine as a… | ||
| Scan124 | Over-oiling and endurance tests of Lodge detachable plugs for the New Phantom. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. To R. from Hs/An. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to EP. Wor. Expl. No. REF Hs/An/A.G101125 BJ3/H9.11.25. NEW PHANTOM -… | ||
| Scan125 | Tests on various sparking plugs to determine their capacity for withstanding oil and sooting up on the New Phantom. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. ORIGINAL EXPERIMENTAL REPORT. Expl. No. REF Hs/AJL/LG101125 To R. from Hs/AJL. c. to CJ. BJ. c. to RG. E. c. to DA. By. c. to EP. Wor. NEW PHANTOM -… | ||
| Scan126 | Comparing the performance and mileage of various makes of spark plugs for New Phantom engines. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/AJL1/L.010112 mileage before failure of the plug under test being compared with the average mileage of the Lodge… | ||
| Scan127 | Car on test, arranging for a temporary body to be fitted and a visit for the following week. | ||
| View original record | To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. ORIGINAL EAC.II +8920 Hsl/LG11.11.25. This car is now on test. We are arranging to fit a temporary body to it because it is not a car… | ||
| Scan128 | Testing and modifying a silencer for the Phantom model. | ||
| View original record | R.R. 498A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hsl2/LCB5.11.25. ORIGINAL. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. EY. c. to Wor. SILENCER FOR PHANTOM. +8230… | ||
| Scan129 | Testing and performance of a Philips A.C. rectifier for charging chassis batteries. | ||
| View original record | To R. from EFC. c. CJ. E. c. PN. RG. c. BY. EP. c. Hy. RE PHILIPS RECTIFIER. X1589 Some time ago you made enquiries as to whether we knew of a suitable A.C. rectifier for charging chassis batteries.… | ||
| Scan130 | Instruction sheet describing a Philips Rectifier apparatus. | ||
| View original record | RR 238 (150 BKS.) (SH57.29-6-20.) MP 224358 ROLLS-ROYCE LTD. INSTRUCTIONS. To: EFC Order No.: AC.64 Customer's No.: X Date: 9. Novs. 1925 Philips Rectifier. This apparatus consists of a transformer, a… | ||
| Scan131 | Preliminary electrical tests of an apparatus, noting voltage application and battery charging. | ||
| View original record | ROLLS-ROYCE LTD. INSTRUCTIONS. To Order No. Customer's No. 2 19 A preliminary test with 100 volts d.c. applied through a voltmeter showed that there was no connection between the a.c. side and any… | ||
| Scan132 | Instructions detailing observations on the electrical behavior of a valve, noting a purple glow and charging characteristics. | ||
| View original record | R 238 (150 BKS.) (SH57. 29-6-20.) MP 224358 ROLLS-ROYCE LTD. INSTRUCTIONS. To Order No. Customer's No. S. 19 occurred in the valve, charging became steady at 6.1 amps (2 1/4 volts) the valve having a… | ||
| Scan133 | Report detailing electrical test results for varying numbers of cells. | ||
| View original record | RR 238(150 BKS.) (SH57. 29-6-20.) MP 224358 ROLLS-ROYCE LTD. INSTRUCTIONS. To Order No. Customer's No. U as above, gave results as follow:- No of cells | Volts | Resis an't | d.c. amps. | a.c. amps. 1… | ||
| Scan134 | Test results and notes on the efficiency of charging electrical cells. | ||
| View original record | RR 23B (150 BKS.) (SH57. 29-6-20.) MP 224358 ROLLS-ROYCE LTD. INSTRUCTIONS. To Order No. Customer's No. 5 19 Results in this condition were as below:- | No of cells | Volts | d.c amps | a.c. amps |… | ||
| Scan135 | Instructions detailing the operation of a valve with a filament and plates. | ||
| View original record | RR 238 (150 BKS.) (SH57.29-6-20.) MP 224358 ROLLS-ROYCE LTD. INSTRUCTIONS. 19 To Order No. Customer's No. 6 would be 33 1/3 % and 4 1/2 % respectively. When lighted a horizontal coil filament can be… | ||
| Scan136 | Observations on the behavior of a circuit with resistance lamps, a valve, and a swivelling link. | ||
| View original record | ROLLS-ROYCE LTD. INSTRUCTIONS. RR 208 (150 BKS.) (SH57. 29-6-20.) MP 224358 To Order No. Customer's No. ✓ 19 with four terminals. When one resistance lamp is removed, the glow inside the valve… | ||
| Scan137 | The performance of Auto-Klean strainers on a test bench and in a car. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/ACL1/LG161125 ORIGINAL To R. from Hs./ACL. c. to CJ. BJ. c. to E. DA. c. to RG. BY. c. to Wor. AUTO-KLEAN STRAINERS.… | ||
| Scan138 | Issues with a strainer, including cleaning failures, fluff particles, and a petrol leak. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Ha/ACL/L/G161125 circular plates and turning the handle did not, as is claimed, clean the instrument. After removing… | ||
| Scan139 | Preliminary results of an experimental test on a high-compression Phantom short chassis at Brooklands. | ||
| View original record | R.R. 498A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. ORIGINAL. Expl. No. REF: Hs/Sm2/1G17.1125. To R. from Hs/Rm. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. CWB. c. to PN… | ||
| Scan140 | Performance graph comparing Road Wheel B.HP against Engine R.P.M. for various car configurations at Brooklands. | ||
| View original record | STAMP: ROLLS-ROYCE, LIMITED, PRINT ROOM, 18 NOV 1925, DERBY. HEADER: BROOKLANDS Nov. 1925 TABLE: CONDITION OF CAR | LAP SPEED | HALF MILE SPORTS CAR HIGH COMPRN. 17 TOOTH AXLE. STANDARD CONDITION C.O.… | ||
| Scan141 | Analyzing the factors affecting a car's maximum speed, with results from tests at Brooklands. | ||
| View original record | R.R. 493A (50H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: Hs/Rm2/LG171125 FACTORS AFFECTING MAXIMUM SPEED. Top wind screen panel raised. .3 m.p.h. Increase of 11.3 clutch HP.… | ||
| Scan142 | Revised advance report on the EAC Silent Starter Gear. | ||
| View original record | To R. from EFC. c. CJ. ORIGINAL EFC6/T19.11.25. X.8650. EAC. SILENT STARTER GEAR. We have had your note EL/M17.11.25. Please find attached a revised copy of the advance report sent to you yesterday by… | ||
| Scan143 | Revised report on modifications to the EAC Silent Starter, detailing changes to windings and relay coil strength. | ||
| View original record | To R. from EFC. c. CJ. EFC2/T18.11.25. (REVISED REPORT) X.8650. EAC. SILENT STARTER. This is now fitted to chassis 9-EX (with a 45° helix), which Mr. Hives is bringing to you to-day. The reference of… | ||
| Scan144 | Gear engagement thump, proposing solutions by modifying the gear ratio or motor windings. | ||
| View original record | EFC2/T18.11.25. -2- Contd. There has been no mechanical modification to prevent the thump on engagement due to the fact that the main power comes on too early, i.e. before the gears come completely… | ||
| Scan145 | Fault condition with a push-button starter system observed on the 9-EX chassis. | ||
| View original record | Contd. -3- EFC2/T18.11.25. Further to the above, there is however a feature (not previously observed on the 93-NK system) which occurs on the present system on 9-EX. If the engine does not, or is not… | ||
| Scan146 | Continued description of an electrical system fault involving the main switch, relay switch, and motor. | ||
| View original record | EFC2/T18.11.25. -4- Contd. whilst the main switch flicks off and on again. The main current is thus restored, but at the second contact of the main switch is of insufficient magnitude again to pull… | ||
| Scan147 | The adjustment and trial of a relay circuit for the engine starter motor. | ||
| View original record | EFC2/T18.11.25. -5- Contd. current winding on the relay core. All the springs, contact pressures, etc. of the relay circuit have been carefully arranged, and we do not think it advisable to reduce the… | ||
| Scan148 | The first run of a V-Condor-2 supercharger engine, detailing over-oiling issues and performance tests. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. ORIGINAL Expl. No. REF: Hs/FCH/LG21.11.25 EXPERIMENTAL REPORT Hs/FCH. c. to C.J. R.J. c. to RG. E. c. to EY. Wor. Handwritten: Y4110 X4550 REPORT OF FIRST… | ||
| Scan149 | Condor 3 engine test, detailing performance, consumption, and supercharger condition. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/PCW/LG21.11.25 The engine was fitted with standard Condor 3. induction pipes and given a half hours' final test.… | ||
| Scan150 | Comparing the moment of inertia of a new light type clutch plate unit against a standard one. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF Hs/ACLL/LG231125 ORIGINAL To R. from Hs/ACL. c. to RG. CJ. c. to BJ. E. c. to DA. EY. c. to Wor. MOMENT OF INERTIA OF EAC.… | ||
| Scan151 | Consumption tests for the 'Phantom' model, comparing its performance to the 'Silver Ghost'. | ||
| View original record | R.R. 493 (40 H) (SL 42 12-7-23). J.H., D. ORIGINAL EXPERIMENTAL REPORT. COPIES TO: RCJ, BJ, WOR, Ey, E, Da, EP, PN, OY, RG, WTS, Hm, H Expl. No. X459 / X4578 REF. Hs10/LG23.11t.25. OBJECT OF TEST.… | ||
| Scan152 | The method for conducting petrol consumption tests on a New Phantom touring car. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rhd/LG211125 NEW PHANTOM - PETROL CONSUMPTION TESTS. METHOD EMPLOYED. These tests were carried out on an open touring… | ||
| Scan153 | Tests on petrol consumption, rolling resistance, and engine friction. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Ha/RmL/LG21125 during the test, the latter being quite independent of the speedometer. From these two readings the… | ||
| Scan154 | Factors affecting petrol consumption, including speed, tyres, carburettor settings, and water temperature. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF:- Hs/Rml./LG.21125 for from 65% to 75% of the total mechanical losses it will be seen that this item has an important… | ||
| Scan156 | Graphs showing the effects of speed, tyre pressure, and mixture control on petrol consumption. | ||
| View original record | TOP SECTION: EFFECT OF SPEED & TYRE PRESSURE ON PET. CONSUMPTION. WATER TEMP. 80°C. IGNITION STANDARD MIXTURE CONTROL CENTRAL AXLE 15 x 52 TYRES STANDARD Graph Title: TYRE INFLATION PRESSURE Y-axis:… | ||
| Scan157 | Series of graphs showing the effects of ignition advance, axle ratio, and engine temperature on petrol consumption. | ||
| View original record | EFFECT OF IGNITION ADVANCE ON PETROL CONSUMPTION WATER TEMP. 80°C. AXLE 15 x 52 SPEED 30 M.P.H. TYRE PRESS. 50 LBS/SQ. MIXTURE CONTROL CENTRAL TYRES STANDARD Graph 1: IGNITION ADVANCE. Y-Axis: M.P.G.… | ||
| Scan158 | The theoretical possibilities and limitations of fuel economy for the Phantom model. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. REF: Hs/Ru/LG211125 FUEL ECONOMY POSSIBILITIES - PHANTOM. The figures given on this blue print (No.4) may seem somewhat… | ||
| Scan159 | Study of theoretical and actual fuel economy improvements for the Phantom model. | ||
| View original record | No. 4 FUEL ECONOMY POSSIBILITIES PHANTOM THEORETICAL IDEAL FACTOR TO BE ELIMINATED. MAX. POSSIBLE IMPROVEMENT IN M.P.G. A. ROLLING & WIND RESISTANCE. TYRE POWER TRANSMISSION LOSSES. - 35% B. ENGINE… | ||
| Scan160 | Car performance, detailing factors affecting petrol consumption and optimum driving speed. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -5- Expl. No. REF Hs/Rm/LG21125 CAR PERFORMANCE. PETROL CONSUMPTION. There is probably no item of a car's road performance which is so… | ||
| Scan161 | Page showing a graph of engine thermal efficiency versus load, with an analysis for a Phantom car. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -6- Expl. No. REF:Hs/Rm1/LG211125 GRAPH 1. [GRAPH] Y-axis: PERCENTAGE THERMAL EFFICIENCY X-axis: PERCENTAGE FULL LOAD OF ENGINE… | ||
| Scan162 | With graphs analyzing the effect of gear ratios and road speed on fuel economy and engine efficiency. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -7- Expl. No. REF. Hs/Rn/LG21125 GEAR RATIO. It is for this reason that a high gear GRAPH II PETROL CONSUMPTION M.P.G. EFFECT OF GEAR… | ||
| Scan163 | Petrol consumption, focusing on the negative effects of acceleration and the use of four-wheel brakes. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -8- Expl. No. REF: Hs/Rm/LG2.11.25 50 m.p.h., the petrol consumption will be doubled. ACCELERATION Acceleration is bad for petrol… | ||
| Scan164 | Carburation, discussing the trade-off between power and fuel economy, illustrated with a performance graph. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -9- Expl. No. REF: Hs/Ral/LG21125 gradual stop with the throttle closed. Again, the average speed of the car almost always is increased… | ||
| Scan165 | Engine carburettor settings and ignition advance, discussing performance and efficiency. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -10- Expl. No. REF: Hs/An/LG21125 thermal efficiency dropping from 17% to 11% with no appreciable loss in power. As for accelerating and… | ||
| Scan166 | Engine friction, rolling resistance, and petrol consumption. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -11- Expl. No. REF: Ha/Rul/LG21.11.25. throttle openings some 20° extra advance can be given with beneficial results, the car could… | ||
| Scan167 | Battery charging rates and internal resistance issues on the 'New Phantom' model. | ||
| View original record | To R. from EFC. c. CJ. c. BY. ORIGINAL EFC2/T23.11.25. x8730 x8660 x I think you probably know that Mr. Minchin of Messrs. Peto & Radford is displeased with our switch positions on the "New Phantom",… | ||
| Scan168 | Continuation page discussing the potential reduction of dynamo output. | ||
| View original record | EFC2/T23.11.25. -2- Contd. and may reduce the output of the dynamo as at present arranged, a little, if deemed necessary after careful consideration. EFC. | ||
| Scan169 | Cover sheet for a report on chassis 8-EX after completing a 2,500-mile test run. | ||
| View original record | To F.H. from Hs. C. to Rd. C. to W.A.R. C. to P.B. C. to W.W.W. ORIGINAL Hs3/LG23.11.25. REPORT ON CHASSIS 8-EX AFTER 2,500 MILES. YS940a We attach report in connection with the above which is running… | ||
| Scan170 | The condition of chassis 8 EX after a 2,500-mile test. | ||
| View original record | Hotel de France, CHATEAUROUX. Indre. France. November 20th, 1925. To: "Hs" From: G.W.Hancock. Report on chassis 8 EX after 2,500 miles. E N G I N E. The oil was drained out of the sump. The filter was… | ||
| Scan171 | Condition report on various engine and exhaust system components. | ||
| View original record | - 2 - Water pump & drive. to L.O.P. E.70527. Water pump is fitted with standard lion packing washer. Condition of this is quite satisfactory. Controls to L.O.P. E.72843 & L.E.C. 2118. These are in a… | ||
| Scan172 | Test report detailing the condition and performance of various engine and vehicle components. | ||
| View original record | - 3 - Exhaust snout & swan neck. The exhaust snout has opened out slightly in the centre, due to the welding of the bridged pieces having given way. With the new type of silencer (rear), the exhaust… | ||
| Scan173 | Inspection report on the condition of various automotive components including connecting rods, bonnet, radiator, and steering. | ||
| View original record | - 4 - Connecting rods. Connecting rods, to E.73762/3 with M/S bushes E.73767 in big end to L.H.C. 208I (Sch.2.A.) We have had no indication that these are not in a satisfactory condition. Bonnet &… | ||
| Scan174 | The performance and condition of various vehicle components during road tests. | ||
| View original record | - 5 - at high speeds on a good road, and suddenly hitting a pot-hole, the steering would be snatched out of the hands if one was not wary. Also at times with reduced speed, on a rough road, the shocks… | ||
| Scan175 | Condition report on a vehicle's front axle, brakes, springs, and headlight controls. | ||
| View original record | - 6 - Lightened front axle, machined all over, G.73975. This appears to be in good condition. We have not observed any distortion of same. Front brake operating shafts on axle. These have worked… | ||
| Scan176 | Test report on headlights, 'Houdaille' front shock absorbers, standard rear axle, rear brakes, petrol tank, and a luggage grid. | ||
| View original record | - 7 - consider it would be better if the angle of the dipping could be increased. At the present time there is a fair amount of glare in the vision of the driver's eyes. They are not so good in this… | ||
| Scan177 | Condition report on various vehicle components including suspension, brakes, electrical systems, and chassis fittings. | ||
| View original record | - 8 - Rear springs, bearings & shackles. These are all in good condition. Rear "Hartford" shock absorbers, to L.O.P. F.71600. Shock absorbers & bearings are in good condition. Shock absorbers have… | ||
| Scan178 | Test results for a car with a limousine body, detailing weight, performance, and tyre specifications. | ||
| View original record | - 9 - Total weight of car with limousine body, 20 gallons of petrol, water, oil, tool kit, ballast, driver & assistant .................................... 2 tons 19 cwts. Total average speed during… | ||
| Scan179 | Bumper test for Phantom chassis front springs, comparing performance with and without Ferodo interleaving material. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs2/LG34.11.25. To R. from Hs. c. to CJ. BJ. c. to RG.✓ E. c. to DA. BY.✓ c. to Wor.✓ BUMPER TEST ON FRONT SPRINGS x8772… | ||
| Scan180 | Comparison of process times in hours, with and without interleaving. | ||
| View original record | contd :- -2- With interleaving: Standard. 13.45 hrs. 15.50 hrs. 18.25 * 11.50 * 21.40 * 20.00 * 10.50 * 12.25 * 13.00 * 17.10 * 13.20 * 13.45 Sample of material is attached to R's and DA's copy of… | ||
| Scan181 | 145-hour bumper test of a new Phantom steering system, comparing solid whitemetal and whitemetal steel threads. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs./1624.11.25. R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. ORIGINAL BUMPER TEST ON LATEST PHANTOM… | ||
| Scan182 | The testing of hydraulic shock absorbers which failed due to distorted aluminium back plates. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. ORIGINAL Expl. No. REF. Hs/Rm1/LG251125 To R. from Hs/Rm. c. to CJ. BJ. c. to RG. H. c. to DA. BY. c. to Wor. R-R HYDRAULIC SHOCK… | ||
| Scan183 | Cross-sectional diagram from a hydraulic shock damper endurance test, noting back plate distortion and a slight oil leak. | ||
| View original record | R.R. HYDRAULIC SHOCK DAMPER ENDURANCE TEST BACK PLATE DISTORTION SLIGHT OIL LEAK W.A.R. 25/11/24 | ||
| Scan184 | Experiments on ignition coil secondary winding arrangements and justifying the standard design. | ||
| View original record | ORIGINAL. To R. from EFC. c. CJ. H. c. EY. RG. EPCA/T26.11.25. RE IGNITION COIL. X4100 Owing to certain recent correspondence in the technical press in which the originator contended that it was wrong… | ||
| Scan185 | Bench and road tests on the Phantom carburetter to address complaints of poor carburation. | ||
| 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. Da EP. C to all PN OY RG Cwie HM H. Expl. No. REF. Hs3/LG26.11.25. OBJECT OF TEST. TESTER. Tests on… | ||
| Scan186 | Brief description of the action, adjustment, and limitations of the New Phantom carburetter. | ||
| View original record | Expl.report. Expl:No. Ref. Hs/ACL/LG26.11.25 A BRIEF DESCRIPTION OF THE ACTION, ADJUSTMENT AND LIMITATIONS OF THE NEW PHANTOM CARB. WITH METHOD OF RECTIFYING TROUBLES POSSIBLE TO ENCOUNTER. In order… | ||
| Scan187 | Page explaining the formula for petrol velocity with a corresponding graph plotting it against air velocity. | ||
| View original record | contd :- -2- Hs/ACL/LG26.11.25 ------------------ decrease in the density of the air in its passage through the carburetter also govern the amount needed. The following example will illustrate the… | ||
| Scan188 | Page discussing the effects of air velocity on fuel mixture and the detailed operation of the New Phantom carburetter. | ||
| View original record | contd :- -3- than at high speeds. We see that an increase of air velocity from 40 ft/sec. to 80 ft/sec. results in an increase in petrol velocity from .387 ft/sec. to 2.8 ft/sec. which means that the… | ||
| Scan189 | Page explaining carburetter adjustment, specifically the relationship between the low speed jet, high speed jet, and the air valve diaphragm, referencing a Phantom carburetter experiment. | ||
| View original record | contd :- -4- adjustment, assuming of course that the carburetter is built up correctly. (1) That the low speed jet is adjusted to give a correct mixture at that engine speed or depression, when the… | ||
| Scan190 | Two graphs showing the position of mixture control versus RPM for carburettor adjustments. | ||
| View original record | contd :- -5- Top Graph: TITLE: POSITION OF CONTROL REQUIRED TO GIVE CORRECT MIXTURE WHEN JET SET TOO EARLY. Y-AXIS: POSITION OF MIXTURE CONTROL NOTCHES WEAK 0 2 4 6 8 10 12 NOTCHES RICH 0 2 4 6 8 10… | ||
| Scan191 | Page detailing possible troubles from incorrect carburetter settings and explaining the automatic range of the carburetter. | ||
| View original record | contd :- -6- POSSIBLE TROUBLES CAUSED BY INCORRECT SETTING. It is quite possible for trouble to occur through the incorrect setting of the low speed jet with relation to the engine speed and lift of… | ||
| Scan192 | Notes on carburetter adjustment, mixture control, and fuel distribution issues. | ||
| View original record | contd :- -7- to the use of the mixture control - which is intended for use in this respect as well as a compensation for atmospheric temp. variations - in order to maintain proportionality. The air… | ||
| Scan193 | Instructions on fuel types, petrol supply, and carburetter adjustments for engine tuning. | ||
| View original record | contd :- -8- trouble - as well as others likely to occur through the use of a poor grade petrol - only good grades should be employed. With regard to the use of special fuels, if desired a 50/50… | ||
| Scan194 | Instructions for setting and testing the carburetter diaphragm, air valve, and low speed jet. | ||
| View original record | contd :- -9- speed jet should be set only within the automatic range of the carburetter i.e. at the speed where the diaphragm is just on the point of admitting air through the diaphragm ports.… | ||
| Scan195 | Typed document discussing the performance and potential troubles of the New Phantom carburetter. | ||
| View original record | contd :- -10- pressure on the air valve and vice-versa if weak. It is unlikely for this trouble to occur due to the spring, providing it has not been stretched or otherwise altered. We may add that… | ||
| Scan196 | Troubleshooting guide table listing engine performance issues and their probable causes. | ||
| View original record | -11- TROUBLE: Richness at low speeds light loads. PROBABLE CAUSE: (1) Jet set before air valve starts to lift. (2) Diaphragm set too low down in high speed choke. (3) Spring pressing tightly on air… | ||
| Scan197 | The 10,000-mile test of the 8-EX car in France, specifically detailing its axle configuration. | ||
| View original record | ORIGINAL To DA. from Hs. Hs5/LG27.11.25. 10,000 MILES TEST CAR IN FRANCE. 48420 8-EX car running in France has a machined axle only which has standard pivots and hubs. Hs. | ||
| Scan198 | Comparative report on different silencer designs and baffle configurations for the New Phantom. | ||
| View original record | Expl: Report. Expl: NO. _____ Ref. Hs/AJL1/LG27.11.25 ORIGINAL y 8230 To R. from HS/WW. c. [REDACTED] c. to [REDACTED] c. to [REDACTED] c. [REDACTED] COMPARATIVE SILENCER TESTS (NEW PHANTOM). Silencer… | ||
| Scan199 | The performance, noise levels, and power loss of various silencer designs. | ||
| View original record | contd :- -2- are diverted owing to this method of spacing the baffles. SILENCER Silencer No.1. was found to be considerably quieter than standard but yet not sufficiently quiet. The exhaust forward… | ||
| Scan200 | Modifications to a silencer's intermediate pipe based on dynamometer test findings. | ||
| View original record | contd :- -3- CONSTRUCTION. 4 BAFFLE PLATES EQUALLY SPACED 9.066 A -> 27.2" 29.2" ( LENGTH OF SHELL ) The above sketch shows disposition of the four transverse silencer baffles E.74339. It was found on… | ||
| Scan201 | Graph comparing engine power curves from various silencer tests. | ||
| View original record | COMPARATIVE SILENCER TESTS — POWER CURVES. ROAD WHEEL B.H.P. ENGINE R.P.M. CUT-OUT OPEN. STD SILENCER No I. No III PARTICULARS OF SILENCERS Nº I:- CONCENTRIC TUBE SILENCER FITTED WITH 3 BAFFLES… | ||
| Scan202 | Cover note for a report on the 8-EX chassis after 5,000 miles of running. | ||
| View original record | To R. from Hs. c. to CJ. BJ. c. to RB. E. c. to DA. BY. c. to Wor. ORIGINAL Hs2/LG27.11.25. 8-EX CHASSIS. REPORT AFTER 5,000 MILES RUNNING. +8940a We attach a report in connection with the above car… | ||
| Scan203 | Chassis 8 EX after a 5,000-mile test. | ||
| View original record | To: "Hs" From: G.W.Hancock. Hotel de France, Chateauroux. Indre. France. November 24th, 1925. Chassis 8 EX. Report after 5,000 miles. E N G I N E. The engine base drained of oil. filter taken out,… | ||
| Scan204 | Condition report on various engine and exhaust components following a test. | ||
| View original record | - 2 - Periods. The periods in engine are slight. The one at 10 to 14 m.p.h. is not now so noticeable. We consider it quite normal. On retard from 50 m.p.h. to 40 m.p.h., the engine is still inclined… | ||
| Scan205 | Condition report on various vehicle components after examination. | ||
| View original record | - 3 - The front silencer lagging is in a delapidated condition. The aluminium cover has been torn away from the hands holding same. We recommend that this should be made of a stouter material.… | ||
| Scan206 | The condition of components including the oil release valve, battery ignition, bonnet, and radiator. | ||
| View original record | - 6 - Oil release valve. As oil pressure failed at low speeds, it was found necessary to dismantle the unit. A small piece of foreign matter was found underneath main oil release valve. This was… | ||
| Scan207 | Inspection report on the condition of vehicle components like the radiator, steering, and gearbox. | ||
| View original record | - 5 - Radiator suspension, shutter & controls. Examination of radiator suspension shews it to be in good condition. We cannot detect any wear having taken place. The shutters have operated perfectly,… | ||
| Scan208 | Inspection report detailing the condition and performance of various vehicle components after testing. | ||
| View original record | - 6 - Starter Motor. This is in good condition, & examination of brush gear shows it to be clean. It has functioned O.K. Starter motor chain has been adjusted up two notches. Flywheel & clutch, to… | ||
| Scan209 | Condition report on various vehicle components including springs, brakes, shock absorbers, and the fuel system. | ||
| View original record | - 7 - Front springs. The two front springs, from outside examination, still appear to be in good condition. The spring clips have remained secure. The flexibility of the springs does not appear to… | ||
| Scan210 | Post-test condition report on various vehicle components including suspension, electricals, and chassis. | ||
| View original record | - 8 - Luggage grid. During the continuation of the test, this has not been in use. Rear springs, bearings & shackles. These are still in a good condition. Rear "Hartford" shock absorbers, to L.O.P.… | ||
| Scan211 | Test report summary detailing vehicle weight, performance metrics, and test conditions. | ||
| View original record | - 9 - Total weight of car with Limousine body, 20 gallons of petrol, water, oil, tool kit, ballast, driver & assistant ............................ 2 tons 19 cwts. Total average speed during test… | ||
| Scan212 | Report comparing the performance of Exide and Accu-Slem batteries for the 40/50 chassis. | ||
| View original record | To R. from EFC. c. CJ. E. c. Da. By. RG. c. Wor. EP. ORIGINAL EFCl/T30.11.25. X.664 - BATTERIES FOR 40/50 CHASSIS. Exide 6BXE15/SPL. Previous standard battery but with exaggeratedly more robust plate… | ||
| Scan213 | The testing and evaluation of experimental batteries from manufacturers Lihanode, Fuller Sparta, and Oldham. | ||
| View original record | EFCL/T30.11.25 -2- Contd. Lihanode. An experimental battery of this type is still in good order, though the results obtained from it do not warrant further investigations. Fuller Sparta. The first… | ||
| Scan214 | Comparison of low and high rate discharge capacity results for Exide, P & R, Fuller, and Oldham batteries. | ||
| View original record | EFCl/T30.11.25. -3- Contd. Exide 6RR5/1 and P & R RR.11 Batteries. These are our present standards, notes upon which were given in our EFCl/T17.10.24. Typical low and high rate discharge capacity… | ||
| Scan215 | Comparison of performance curves and discharge capacity tests for various battery types including Fuller, Oldham, Exide, and P & R. | ||
| View original record | EFC1/T30.11.25. -4- Contd. Further, on sheet X we show a comparison of curves of the two standards and the experimental Fuller and Oldham made to the standard specification, and it will be noted that… | ||
| Scan216 | Composition and testing of various battery types and their cells. | ||
| View original record | EFC1/T30.11.25. -5- Contd. S1, S2, S3, S4. Each of these batteries consists of three standard P & R and three standard Exide cells in alternate order. Two of these are at present on experimental… | ||
| Scan217 | The testing of various battery cells and their performance under different charging and discharging conditions. | ||
| View original record | EFC1/T30.11.25. -6- Contd. Further batteries that will be made up out of the various cells available are SU, SV and SW, each of which will contain, arranged in different ways 1 Exide cell 1 P & R " 2… | ||
| Scan218 | Battery charging characteristics, comparing Exide and P & R cells and proposing a specification change. | ||
| View original record | EFC1/T30.11.25. -7- Contd. current is not quite so high as is reached a little later on, indicating that the battery actually has a higher resistance during these first few moments. It is an important… | ||
| Scan219 | Chassis variations, identifying battery internal resistance as the cause over generator inconsistencies. | ||
| View original record | EFCL/T30.11.25. -8- Contd. It has transpired that the variations which have occurred from chassis to chassis are not so much due to variations in the generators which appear, provided they pass the… | ||
| Scan220 | Graph comparing high rate discharge curves for various 40-50HP chassis batteries. | ||
| View original record | Title: 40-50HP CHASSIS BATTERIES. CONTINUOUS HIGH RATE DISCHARGE CURVES THROUGH INVARIABLE EXTERNAL RESISTANCE OF .100 OHM. BATTERIES - 149, 150, 151, 157, 163, 164, 169. X-Axis: TIME (MINUTES).… | ||
| Scan222 | The performance of the 10-EX car on the Brooklands track. | ||
| 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. Da EP PN RG WR3 MH Expl. No. X4578 X788 X8771 REF. Hs1/LG30.11.25. OBJECT OF TEST. Performance on… | ||
| Scan223 | Windage and acceleration tests conducted on the 10-EX New Phantom car at Brooklands. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/Rm/LG30.11.25. BROOKLANDS TESTS - NEW PHANTOM. We have carried out our standard windage and accel-eration tests on… | ||
| Scan224 | Performance tests and analysis of a sports car versus a standard Phantom. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT -2- Expl. No. REF Hs/Rm/LG30.11.25. in the back of the car is considerable. Any delicate measuring instrument therefore suffers… | ||
| Scan225 | Analysing car performance with a high axle ratio and high compression engine. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: Hs/Rm/LG30.11.25. performance due to a high axle ratio and high compression engine. On direct drive, owing to the… | ||
| Scan226 | Comparing the braking performance of the 10-EX and 98-NK cars with the standard Phantom. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. REF Hs/Rm/LG30.11.25. of the improvement. The standard Phantom is represented by a car with a H.P. curve which is a little… | ||
| Scan227 | Frame distortion for a standard 20 HP vehicle tested on a bumping rig. | ||
| View original record | R.R. 493a (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. ORIGINAL Expl. No. REF: Hs4/LG30.11.25. To R. From Hs. c. to CJ. BJ. c. to DA. E. c. to BY. Wor. FRAME DISTORTION. X4260 X4268 Attached… | ||
| Scan228 | Frame distortion tests on the bumper for a 20 HP chassis. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT Expl. No. REF: Hs/BB/1.G7 4. 25. 20 HP. CHASSIS. FRAME DISTORTION TESTS ON BUMPER. 2" cams at 180°C. We have made some preliminary tests… | ||
| Scan229 | Chassis frame warp and distortion. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. -2- Expl. No. REF: Hs/RB/LG7.4.25. EXPERIMENTAL REPORT. (a) Frame warp along its longitudinal axis - as - OR (b) Frame distortion from square to rhomboid… | ||
| Scan230 | Frame distortion and twist in relation to rear engine suspension tightness. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: Hs/RB/LG7.4.25 This confirms that the frame distorts as in 2. (a) and proves that the direction of twist between the… | ||
| Scan231 | With a sketch detailing markings on chassis cross members and proposing diagonal bracing to prevent horizontal distortion. | ||
| View original record | R.R. 498A (50 H) (D.D. 31, 12-6-25) J.H.D. -4- Expl. No. REF Hs/RB/LG7.4.25. EXPERIMENTAL REPORT. Sketch shewing markings on plate 2nd. X member. DASHBRACKET 3RD CROSS MEMBER. No vertical component.… | ||
| Scan232 | Over-oiling complaints on the New Phantom, detailing tests with 'L' shaped piston rings and varying oil supply to bearings. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. ORIGINAL EXPERIMENTAL REPORT. Expl. No. REF Hs5/LG1.12.25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. NEW PHANTOM COMPLAINTS. 48770… | ||
| Scan233 | Over-oiling, noisy tappets, and clutch jaggers. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT -2- Expl. No. REF: Hs5/LG1.12.25. In the case of worn bearings, there is definitely less oil thrown out when the three bearings only are… | ||
| Scan234 | Issues with clutch, exhaust, steering, timing gears, springing, governor control, and acceleration. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF. Hs5/LG1.12.25. but it is one of the biggest factors we have proved. Clutch jaggers occur with the latest lightened clutch… | ||
| Scan235 | Vehicle issues such as brakes, engine, clutch, and steering. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. REF Hs5/LG1.12.25. Brakes. Grab - we do not understand what is meant by this. Squeaks - 8-EX car which is running in… | ||
| Scan236 | Investigating oil contamination on the friction faces of brake servo motors. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. ORIGINAL. EXPERIMENTAL REPORT. Expl. No. REF Hs/Rml/LG1.12.25. To R. from Hs./Rm. c. to CJ. BJ. c. to RG. E. c. to DA. EY. c. to Wor. E.A.C. OILY BRAKE SERVO… | ||
| Scan237 | Page 2 of an experimental report discussing oil leakage on servo plates and proposing solutions. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT -2- Expl. No. REF: Hs/Rmd/LGL.12.25. normal touring conditions and a further 200 drops of oil was added through the lubricator. It was… | ||
| Scan238 | Diagram illustrating the distribution of oil from excessive lubrication at a specific point in a mechanism. | ||
| View original record | DISTRIBUTION OF OIL THROUGH EXCESSIVE LUBRICATION AT POINT 'A'. A B R N S D1 X ROLLS-ROYCE LTD. PRINT ROOM 1 DEC 1925 DERBY | ||
| Scan239 | Testing an alternative scheme for the suction Autovac fuel feed system. | ||
| 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 Da (OY) (RG) Expl. No. 3579 3503 REF. Hs1/LGS.12.25. OBJECT OF TEST. ✓ Alternative scheme to… | ||
| Scan240 | Tests of the Autovac vacuum feed system and its limitations on a Silver Ghost engine. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF Hs/AJL/LG3.12.25. VACUUM FEED. We have carried out a series of tests in which the old Silver Ghost pressure feed pump was… | ||
| Scan241 | Tests on a modified petrol supply system using a reduced volume pump and vacuum tank. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF Hs/AJL/LG3.12.25. the compression space was reduced to 1/3 its original volume viz. from 28 c.c to 8 c.c. The suction… | ||
| Scan242 | Table of results for Autovac tests showing induction pipe depression on a 40/50 Silver Ghost. | ||
| View original record | AUTOVAC TESTS. TABLE 1. INDUCTION PIPE DEPRESSION. Table of results with Autovac on 40/50 Silver Ghost - all readings at full throttle. | R.P.M. | Average engine demand pts/hr. | Autovac supply… | ||
| Scan243 | Table of results from Autovac tests on a 40/50 HP Silver Ghost using an old pressure pump. | ||
| View original record | AUTOVAC TESTS. TABLE 11. Table of results when using the old pressure pump as a means of exhausting the Autovac on 40/50 HP. Silver Ghost. | | | Autovac supply pts/hr. for different petrol levels. | |… | ||
| Scan244 | Cover memo for a report on chassis 8-EX after completing 7,500 miles. | ||
| View original record | To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. EY. c. to WoF. ORIGINAL Hs5/LG5.12.25. REPORT ON CHASSIS 8-EX AFTER 7,500 MILES. We attach copy of report in connection with the above car which is… | ||
| Scan245 | Chassis 8 EX after completing 7,500 miles, detailing engine condition, lubrication, valves, pistons, and ignition plugs. | ||
| View original record | Hotel de France, Chateauroux. Indre. France. December 2nd, 1925. To: "Hs" From: G.W.Hancock. Report on chassis 8 EX after 7,500 miles. ENGINE. The condition of the engine is generally good. Oil… | ||
| Scan246 | Condition report on various engine components, including details on an oil leak and exhaust system modifications. | ||
| View original record | - 2 - Periods. The periods of the engine have not noticeably altered since our previous report. Engine gears. These are still in good condition. No rattles have been noticed. Engine case. As… | ||
| Scan247 | Vehicle condition report detailing the state of various engine and exhaust components. | ||
| View original record | - 3 - Exhaust cut-out. New exhaust cut-out operation to N.S. 2012/13. We have not experienced any trouble with operation of cut-out. Condition of cut-out spindle, rods & levers is good. Exhaust snout… | ||
| Scan248 | Condition report on various vehicle components including ignition, engine, and steering systems. | ||
| View original record | - 4 - Battery ignition. Coil Redmanol encased 2.H. 710. Improved ventilation to distributor head to L.E.C. 2121? Drwgs.71005/6. Contact points special large diameter Tunstall. This has continued to… | ||
| Scan249 | Condition report on various vehicle components including the gearbox, servo, clutch, and starter motor. | ||
| View original record | - 5 - Gearbox & actuating gear, to L.O.P. G.73552. The suspensions of gearbox are still O.K. Gears have remained good, & there has been no tendency for any of the gears to come out of mesh. There is… | ||
| Scan250 | The condition of various chassis components including brakes, axles, steering, springs and headlights after testing. | ||
| View original record | - 6 - Front brake operating shafts on axle. The bearings of these are still in good condition, & shafts have operated satisfactorily. Axle pivots, with modified operating shafts with larger bearings,… | ||
| Scan251 | Condition report on the front shock absorbers, rear axle, rear brakes, and petrol tank. | ||
| View original record | - 7 - under the scuttle will not stay on. We have had no trouble during the continuation of the test with the lamps not staying in their upright position. "Houdaille" front shock absorbers &… | ||
| Scan252 | Post-test condition report for various vehicle components and a summary of test statistics. | ||
| View original record | - 8 - Rear springs, bearings & shackles. From outside examination these appear to be in good condition. Rear "Hartford" shock absorbers, to L.O.F. F. 71600. These have been dismantled & it was found… | ||
| Scan253 | The causes and solutions for 'servo jaggers' in braking systems. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. ORIGINAL Expl. No. REF: Hs2/LG7.12.25. To R. from Hs. c. to CJV BJ. c. to RGV E. c. to DA. BY. c. to Wor. SERVO JAGGERS. +8370 T5370 We… | ||
| Scan254 | The comparison of 3 and 7 oil feeds to crankshaft bearings. | ||
| 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. Da. OY RG Expl. No. +8980 REF. Hs4/LG7.12.25 OBJECT OF TEST. Comparison of 3 and 7 oil feeds to… | ||
| Scan255 | New Phantom engine oil flow, comparing tests with 7 and 3 direct oil feeds. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/ACL/LG7.12.25. NEW PHANTOM EXPERIMENTS: WITH 7 AND 3 DIRECT OIL FEEDS. We have carried out several experiments with… | ||
| Scan256 | Oil consumption and discharge through engine bearings, comparing results from 3 and 7 oil feeds. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/ACL/LG7.13.25 [Graph Title] OIL CONSUMPTION & DISCHARGE THROUGH BEARINGS WITH 7 & 3 FEEDS ON NEW ENGINE OIL PRESS… | ||
| Scan257 | With a graph showing oil consumption and discharge for an engine with 7 and 3 bearing feeds. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: HS/ACL/LG7.12.25 noticed to be proportionally greater at the high speeds than at the low. From the curves given here… | ||
| Scan258 | Investigating oil pressure differences between main and intermediate engine bearings. | ||
| 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/LG7.12.25. obtained for the previous engine tested. The oil pressure and oil temperature of oil supply to the… | ||
| Scan259 | Showing engine oil pressure in various bearings plotted against engine RPM. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -5- Expl. No. REF: Hs/ACL/LGT.12.25. [Graph Text] TITLE: OIL PRESSURE AT INTERMEDIATE BRGS WITH DIRECT FEED TO 3 MAIN BRGS. ONLY. [2… | ||
| Scan260 | Calculated oil pressure at big ends due to centrifugal force and the effects of bearing leakage. | ||
| View original record | R.R. 493A (50 H) (D.D. 91, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -6- Expl. No. REF: Hs/ACL/LG7.12.25 Graph Title: CALCULATED OIL PRESS AT BIG ENDS DUE TO CENTRIFUGAL FORCE Graph Y-Axis: OIL PRESS… | ||
| Scan261 | Report and graph detailing oil consumption for the 40/50 HP (Silver Ghost) engine, with comparisons to the Phantom model. | ||
| View original record | -7- HS/ACL/LG7.12.25 [Graph Title] 40/50 H.P. OIL CONSUMPTION AT CONSTANT SPEED OF 2000 R.P.M. FOR VARYING OIL FLOW THROUGH BEARINGS. [SILVER GHOST] [Y-Axis] OIL CONSUMPTION PTS/HR. [X-Axis] OIL… | ||
| Scan262 | Oil temperature and flow characteristics for Phantom and 40/50 HP engines. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -8- Expl. No. REF: Hs/ACL/LG7.12.25 worked out at 509 m.p.g. for the Phantom and 527 m.p.g. for the 40/50 HP. The corresponding oil… | ||
| Scan263 | Page discussing the factors influencing oil temperature in bearings and comparing different oil flows. | ||
| View original record | R.R. 498a (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -9- Expl. No. REF: Hs/ACL/LG7.12.25 The temperature given by these curves cannot be taken as being entirely due to the passage of oil… | ||
| Scan264 | The failure of bolts holding the front end of a Phantom's subframe. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs3/LGS 12.12.25 To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. EY. c. to Wor. PHANTOM - FAILURE OF BOLTS HOLDING… | ||
| Scan266 | Magnetos without automatic advance for the new Phantom chassis. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.L. EXPERIMENTAL REPORT. Expl. No. 8790 ORIGINAL REF. EFC1/T8.12.25. To R. from EFC. c. E. CJ. c. By. Da. c. RG. MAGNETOS WITHOUT AUTOMATIC ADVANCE FOR NEW… | ||
| Scan267 | The comparative bench tests of B.T.H. and Watford magnetos, focusing on noise, weight, and price. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Contd. -2- Expl. No. REF: ERM/TM.12.25. The following are the comparative results of bench tests of these two B.T.H. magnetos interspar… | ||
| Scan268 | Comparing the specifications of Watford and B.T.H. magnetos. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Contd. -2- Expl. No. REF: M/A.7/H.12.6.25. (3) The H.T. safety gaps in the two magnetos are:- Watford 8.5 mm. B.T.H. 7.5 mm. In regard… | ||
| Scan269 | Endurance, circuit, and utility tests on two magnetos with tabulated results. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Contd. Expt. No. REF: W.1329 / 12.12.25. (6) Endurance tests carried out on the two machines in which they were run for 7 hours at 2000… | ||
| Scan270 | Magneto and Remy coil tests, detailing spark gap and performance measurements. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. -5- EXPERIMENTAL REPORT. Contd. Expl. No. REF FPM/18.12.25. (a) Nothing connected across. (b) The secondaries of two Remy coils in series connected across,… | ||
| Scan271 | Page comparing high and low speed sparking characteristics of different magnetos. | ||
| View original record | R.R. 493A (SO H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Contd. -6- Expl. No. REF:/VB.12.25 (12) High speed sparking Characteristics. The highest speed at which the magnetos were capable of… | ||
| Scan272 | Continuation on steering column backlash and magneto noise comparison. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Contd. -7- Expl. No. REF: EFC/CR.12.25. steering column. This will reduce the rate of development of backlash in the linkage system, and… | ||
| Scan273 | Specification of performance for a 6-cylinder magneto without automatic advance for the 40/50 car. | ||
| View original record | 25.2.25. SPECIFICATION OF PERFORMANCE OF 6-CYLINDER MAGNETO (WITHOUT AUTOMATIC ADVANCE) FOR R.R. 40/50 CAR. (1) The weight of the magneto complete but without coupling shall not exceed 13 lbs. (2) The… | ||
| Scan274 | Testing procedures for a magneto's spark-producing capability under various adverse conditions and speeds. | ||
| View original record | -2- Contd. (5) The magneto shall now be subjected to a utility test, i.e. a test to find out its capability of producing sparks under adverse (i.e. leaky) plug conditions. For this purpose a 3.0 mm.… | ||
| Scan275 | Specifications for magneto operation, including minimum sparking speed and timing adjustments. | ||
| View original record | -3- Contd. Note:- The minimum regular sparking speed can be taken to be that speed at which 100 consecutive sparks, without missing, are given by the magneto at some time within a period not greater… | ||
| Scan276 | Graph showing the variation of O.C. volts with the hand lever position for a B.T.H. Magneto Type FM6. | ||
| View original record | B.T.H. MAGNETO TYPE FM6 NO 356,071 CURVE SHOWING VARIATION OF O.C. VOLTS WITH POSITION OF HAND LEVER ON CAM NOTE. SLEEVES RIGIDLY FIXED TO LEVER. VOLTS. (SPEED CONSTANT) 9.0 8.5 8 ADVANCE. 10° 20° 30°… | ||
| Scan277 | Curve showing the variation of O.C. volts with cam lever position for a Watford E06A Magneto No 73970. | ||
| View original record | WATFORD E06A MAGNETO No 73970. CURVE SHOWING VARIATION OF O.C. VOLTS WITH CAM LEVER POSITION. NOTE. SLEEVES RIGIDLY CONNECTED TO LEVER. VOLTS (SPEED CONSTANT). 8.0 7.5 7.0 POSITION OF MAXIMUM FLUX… | ||
| Scan278 | Tests on high-speed steering wobbles by altering wheel and pivot pin configurations. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. ORIGINAL Expl. No. REF: Hs/Rnl/LG8.12.25 EXPERIMENTAL REPORT. HIGH SPEED STEERING WOBBLES. +657 X8430 To R. from Hs/Rm. c. to CJ. BJ. c. to RG. E. ✓ c. to… | ||
| Scan279 | Steering wobbles, friction, and the effect of wheel dishing. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/Sel/LCR.12.25 pivot pin, and the tyre contact about 3" outside centre point. Under these circumstances we could… | ||
| Scan280 | Schematic showing the distance between the point of intersection of the pivot and the centre line of the tyre. | ||
| View original record | [ "Ex 935", "¢ OF WHEEL", "DISTANCE INSIDE CENTRE POINT = 1.597", "Ex 9378", "THIS NUT IS REDUCED TO PREVENT IT FOULING THE BRAKE DRUM", "MAKE FROM F.4942", ".125 PLAIN PORTION OF STUD TO LOCATE IN… | ||
| Scan281 | The Autovac Galometer, an instrument for registering the volume of petrol used by an engine. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. To R. from Hs/AJL c. to CJ. BJ. c. to RG. E. c. to DA. CWB. c. to BY. Wor. ORIGINAL Expl. No. REF: Hs/AJL/LG9.12.25 THE AUTOVAC… | ||
| Scan282 | The operation and calibration of the Autovac fuel measurement system, page 2. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF He/AJL/LCG 12. 25. It will be seen from the above that the correct working of the instrument is dependent upon the… | ||
| Scan283 | The relative petrol levels in a float chamber and outer reservoir. | ||
| 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/LG9.12.25. Fig.1. above shows the relative levels on the float chamber and outer reservoir when working with a… | ||
| Scan284 | Petrol levels, a Galometer, and fitting a measuring Autovac to a Phantom tank. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-8-25) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. REF:Hs/AJL/LG9.12.25. outer reservoirs being empty at the time of starting up, the level C. is very low and the float is… | ||
| Scan285 | Comparing the particulars of a 'Measuring Autovac' with a 'Standard Autovac'. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.L. EXPERIMENTAL REPORT. -5- Expl. No. REF Hs/AHL/LG9.12.25. Instead of the standard useful capacity of .9529 galls. it is reduced to .670 galls. or a reduction… | ||
| Scan286 | Comparing the Stewart Vacuum Feed system with the Autovac system on a Phantom engine. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. ORIGINAL Expl. No. REF Hs/AJL/A.12. 12. 25. EXPERIMENTAL REPORT. To R. from Hs/AJL. c. to CJ. BJ. c. to RG. E. c. to DA. OY. c. to EY. WOR+ STEWART VACUUM… | ||
| Scan287 | Comparing the Stewart tank float and the Autovac system's effect on the engine's induction. | ||
| View original record | R.R. 493a (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF Hs/AJL/LG14.12.25 to the induction system. This together with the fact that the Stewart tank float has a longer stroke… | ||
| Scan288 | Cross-sectional diagram of a Stewart Vacuum Tank with component annotations and dimensions. | ||
| View original record | STEWART VACUUM TANK. SUCTION RESTRICTION TO SYSTEM AIR PETROL Two Springs Used. FLOAT DIAM = 3" FLOAT CHAMBER DIAM = 3.375" STROKE OF FLOAT = .875" A.J.L. | ||
| Scan289 | The 10,000 miles test of the 8-EX car in France, detailing oiling performance. | ||
| View original record | To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. 8-EX CAR. 10,000 MILES TEST IN FRANCE. Attached is a report on the above at the conclusion of 10,000 miles. Standardisation sheets… | ||
| Scan290 | The performance of Chassis 8 EX following a 10,000-mile test. | ||
| View original record | To: "Hs" From: G.W.Hancock. Hotel de France, Chateauroux, Indre. France. December 10th, 1925. Chassis 8 EX. Report at finish of 10,000 miles. ENGINE. The performance generally during the 10,000 miles,… | ||
| Scan291 | Test report on the condition of various engine components following a mileage run. | ||
| View original record | - 2 - Pistons, fitted with new Brico unlapped piston rings. Towards the finish of the test there were slight piston knocks when starting up when engine was cold. These disappeared immediately the… | ||
| Scan292 | The condition and performance of controls, induction pipe, carburetter, and exhaust system components after testing. | ||
| View original record | - 3 - Controls, to L.O.P. E.72843 & L.E.C. 2118. These have operated satisfactorily & very little wear has taken place. Induction pipe & carburetter. Smaller diameter aluminium pipe & bend (water… | ||
| Scan293 | Status report on various vehicle components including the exhaust, magneto, suspension, and drive systems. | ||
| View original record | - 4 - Exhaust cut-out. New exhaust cut-out operation to N.S. 2012/13. We have not had any sticking of cut-out, or rattles. It has functioned O.K. & is still in good condition. The levers & rods appear… | ||
| Scan294 | Test report on the condition of various vehicle components after testing. | ||
| View original record | - 5 - The oil holes were free & all other parts of the slipper wheel were well covered with oil. The appearance of the bakerlite rings gave an impression of their having become overheated at some… | ||
| Scan295 | Condition of various vehicle components after testing, including the bonnet, radiator, and steering system. | ||
| View original record | - 6 - It would be advantageous if more margin was allowed for the settling down of the bonnet. The O.S. has remained O.K. The bolts holding bonnet strips on N.S. & O.S. have again worked loose. These… | ||
| Scan296 | Test report on the performance of steering, gearbox, servo, starter motor, and other vehicle components. | ||
| View original record | - 7 - The oscillations are almost negligible. On good & even cambered roads, the steering is very good. It is inclined to be unstable on uneven cambered roads. This is rather difficult to describe,… | ||
| Scan297 | Test report detailing the condition and wear of various chassis and powertrain components. | ||
| View original record | - 8 - to L.E.C. 2067. Flywheel & clutch, Simplified clutch stop to L.E.C. 2080 & L.O.P. G.73748. The clutch has slipped twice during the continuation of the test, when picking up in top gear. This has… | ||
| Scan298 | Condition report on front brakes, springs, headlights, and shock absorbers following a 10,000-mile test. | ||
| View original record | - 9 - Front brakes, drums & shoes. The front brake liners have worn quicker than normally during the 10,000 miles, & frequent adjustments have had to be made. They are no better than the standard… | ||
| Scan299 | Condition report on various vehicle components after a mileage test, page 10. | ||
| View original record | - 10 - Standard rear axle. This has remained good throughout the test, & has not deteriorated in its running qualities since beginning its test. Rear brakes & actuating shafts. Metal dirt excluders on… | ||
| Scan300 | The condition of a vehicle's body subframe, pedals, and chassis after testing, including performance data. | ||
| View original record | - 11 - Body subframe, using subframe brackets F.72192, F.73239 to N. Sch. 2001/2. There is evidently considerable side strain on bolts holding body to subframe, as we have broken three bolts in this… | ||
| Scan301 | Oiling tests for the Phantom model. | ||
| 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. Da. GY RG Expl. No. 8980 REF: Hs3/LG15.12.25 OBJECT OF TEST: Oiling tests on Phantom. TESTER: A.C.… | ||
| Scan302 | Oil feed and consumption tests for the Phantom and Silver Ghost models. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: HS/ACL/LG15.12.25 FURTHER EXPERIMENTS WITH 3 OIL FEEDS ON PHANTOM AND TESTS ON SILVER GHOST. Reviewing the question of… | ||
| Scan303 | Showing oil consumption on a Silver Ghost with graphs for varying oil pressures and flow rates from road tests. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF No./ACL/LG151225 Graph 1 Title: OIL CONSUMPTION ON SILVER GHOST WITH VARIOUS OIL PRESSURES. RESULTS FROM ROAD TESTS.… | ||
| Scan304 | Oil feed arrangements and leakage tests on Phantom and Silver Ghost cars. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF file/ACL/LG151225 Furthermore the results we have obtained from two cars on test, a Phantom and a Silver Ghost, show… | ||
| Scan305 | Oil discharge from Phantom engine bearings, comparing results with and without grooves in the intermediate bearings. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. REFHs/ACL/LG151225 [Graph] Graph Title: OIL DISCHARGE ON PHANTOM WITH 3 MAIN OIL FEEDS. WITH & WITHOUT GROOVES IN THE… | ||
| Scan306 | The causes of overoiling and the factors that control oil consumption. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -5- Expl. No. REF: Hs/ACL/LG151225 13 lbs/sq.in. at pressure without any ill effects on the bearing. SUMMARY OF FACTORS CONTROLLING OIL… | ||
| Scan307 | Methods to reduce oil consumption in engines, specifically discussing 'L' section piston rings and piston designs. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -6- Expl. No. REF./ACL/LG151225 influence on the consumption and probably the greatest reduction in consumption of a badly overoiling… | ||
| Scan308 | Modifications being made to a Phantom engine for bench and road testing. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.L. EXPERIMENTAL REPORT. -7- Expl. No. REF. HS/ACL/LG1512X5 We are at the present time engaged in fitting up a Phantom with such modifications and hope before… | ||
| Scan309 | Unsuccessful testing of a spring-based solution for 'servo jaggers' and recommending flexibility in the servo engagement. | ||
| View original record | To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. EY. c. to Wor. SERVO JAGGERS. X5370 X8370 We omitted to mention in our Hs2/LG7.12.25. that we have tested the scheme given in DA's N.sch.2075 in… | ||
| Scan310 | Daimler car, analysing the reasons for a lower risk of wobbles. | ||
| 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 PN RG Expl. No. X608 REF. Hs2/LG31.12.25 OBJECT OF TEST. Daimler Car. Experimental data. TESTER. W.A.… | ||
| Scan311 | The particulars and engine performance of a new Daimler car following a trial run. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hg/LG/RM31.12.25 NEW DAIMLER TRIAL RUN. Particulars of car. Bore 81.5 - Stroke 117. Displacement - 3568 c.c. Axle ratio -… | ||
| Scan312 | Over-oiling tests, gearbox noise, and clutch performance. | ||
| View original record | R.R. 493A (50 H) (D.D. 81, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF Hs/HS/LG31.12.25 'tinny' in proximity to manifold. Detonations scarcely audible at any speed or throttle opening.… | ||
| Scan313 | Evaluating the steering, brakes, suspension, and rear axle performance of a vehicle. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: Hs/Bm/0.331.12.5 being a very good example of the single plate clutch. The thrust race was very noisy. STEERING.… | ||
| Scan314 | The road performance of a Daimler car, detailing its acceleration, high-speed vibrations, and a hill climb test. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.L. EXPERIMENTAL REPORT -4- Expl. No. REF: Hs/An/LC.31.12.25 ROAD PERFORMANCE OF CAR. The liveliness of this car is a great advance on anything that has… | ||
| Scan315 | Road tests of a Daimler car, focusing on balloon tyres and wobble risk. | ||
| 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 Da EP. PN OY. Expl. No. 608 REF. Hs2/LG31.12.25. OBJECT OF TEST. Daimler Car. Experimental Data.… | ||
| Scan316 | Trial run report for a new Daimler, detailing vehicle particulars and engine performance. | ||
| View original record | NEW DAIMLER - TRIAL RUN. Particulars of car. Bore 81.5 - Stroke 117. Displacement - 3568 c.c. Axle ratio - worm drive. Limousine body. Springing - semi-elliptic. Car weight - no passengers - 1.952… | ||
| Scan317 | Test report on engine over-oiling, gearbox noise, clutch performance, and steering gearing. | ||
| View original record | -2- OVER-OILING. We carried out careful tests to ascertain if this engine shewed any signs of oiling up plugs. The engine was run light for ten minutes and then suddenly accelerated; the quantity of… | ||
| Scan318 | Test report page evaluating vehicle performance, covering tyres, steering, brakes, and suspension. | ||
| View original record | contd :- -3- Hs/Ma/LG31.12.25. ------------------ Tyre contact appears to be at least 1.5 to 2" outside centre point. Equally light, not quite so selective. Self-centres very well. Good for absence of… | ||
| Scan319 | The road performance and general impression of a car, including a timed hill climb test on Brockley Hill. | ||
| View original record | -4- ROAD PERFORMANCE OF CAR. The liveliness of this car is a great advance on anything that has previously been produced by the Daimler Co. Its low speed acceleration was very good indeed, being of… | ||