Rolls-Royce Archives
| Identifier | Entry | ||
| Scan0 | The failures observed during a bump test of an EAC.11 chassis. | ||
| View original record | R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. Hs/RS/LG. REF: 1.1.25 BUMP TEST OF EAC.11. CHASSIS. New frame fitted since last test. Specification of chassis. Frame. As… | ||
| Scan2 | Table detailing the failures of road springs, including their running time, fracture positions, and material properties. | ||
| View original record | -3- ROAD SPRING FAILURES. Ref. No. | Piece No. | Time run. hrs.mins. | Position of spring. | Position of leaf. | Position of fracture. | Thick-ness. | Brinell. | Comp-ression. | Rebound --- | --- |… | ||
| Scan3 | Diagram illustrating a fracture on an off-side front engine support following a bump test on an E.A.C.II chassis. | ||
| View original record | BUMP TEST OF E.A.C.II CHASSIS. CRACK OFF-SIDE FRONT ENGINE SUPPORT (E 71430) FRACTURED AS SHEWN, AFTER 146 HRS. 10 MINS. 17-12-24 | ||
| Scan6 | Bumping tests for the 'W' Series, detailing frame failures, modifications, and further tests. | ||
| 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. PN-DY RG Expl. No. 8772 REF. Hs3/L07.1.25. OBJECT OF TEST. TESTER. Bumping tests on RAC. 'W'… | ||
| Scan10 | Requesting critique on a report concerning the EAC Throttle Governor in comparison to the 40/50 HP governor. | ||
| View original record | To E. from Hs. ORIGINAL Hs5/LGS.1.25. EAC. THROTTLE GOVERNOR. X8140 Attached is a report from Rm. in connection with the EAC. Throttle Governor. We know that the Sales Dept. will make critical… | ||
| Scan12 | Technical comparison with formulas for the respective behavior of 40/50 HP and EAC governors. | ||
| View original record | -2- GENERAL. RESPECTIVE BEHAVIOUR OF 40/50 & EAC. GOVERNORS. Let engine r.p.m. be n. R.P.M. " pull from governor be X lbs. " " " spring x lbs. Rating of " " p lbs/1". Let engine revs. fall by r.… | ||
| Scan13 | Comparison of the EAC and 40/50 throttle governor performance, with calculations and a road use scenario. | ||
| View original record | -3- PARTICULAR. COMPARISON OF EAC. & 40/50 THROTTLE GOVERNOR. EAC. 1000 r.p.m. Governor pull 5.75. 900 r.p.m. Governor pull 4.5. Decrease 1.25 lbs. 40/50. 1000 r.p.m. Governor pull 2.5 900 r.p.m.… | ||
| Scan14 | Continuation of a report comparing governor control sensitivity and calculations for spring requirements. | ||
| View original record | -4- which in the extreme case only increases the throttle opening by 1/240 of the total range, a hardly appreciable amount. Now upon another occasion the governor is set to give a speed of 30 m.p.h.… | ||
| Scan15 | The inconsistency of the EAC governor at reasonable road speeds and its effect on performance. | ||
| View original record | -5- INCONSISTENCY OF GOVERNOR AT REASONABLE ROAD SPEEDS. This is due to the EAC. governor being considerably more powerful than that of the 40/50 HP. and at the same time the same operating spring… | ||
| Scan16 | The performance characteristics and tendencies of governor-controlled throttle systems. | ||
| View original record | -6- with the 40/50 full throttle would be available. The car speed will therefore fall off when the slightest gradient is encountered due to the governor controlled range being limited to 18°. 40/50… | ||
| Scan18 | The completion of the 'V' series chassis and an update on the oil relay governor. | ||
| View original record | R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs6/LGS.1.25. To R. from Hs. c. to CJ. BJ. c. to E. DA. ✓ c. to BY. ✓ Wor. ✓ S E C R E T. 'V' SERIES CHASSIS. X8770 X.8685… | ||
| Scan22 | The carburetter for the EAC engine. | ||
| View original record | R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs/ACL/LMB.1.25. REPORT ON CARBURETTER FOR EAC. ENGINE. First we will deal with the results of the tests we have carried… | ||
| Scan23 | The performance and adjustment of carburettor mixture control. | ||
| View original record | R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/ACL/LG15.1.25. The notches on the mixture control were plotted against the r.p.m. Therefore the number of notches… | ||
| Scan24 | Carburetter performance, detailing a weak spot causing engine 'popping back' and analysing mixture characteristics. | ||
| View original record | R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: He/ACL/L.G15.1.25. The weak spot is very marked. It causes uneven running and if the engine is accelerated from this… | ||
| Scan25 | The reasons for troubles arising with the EAC Carburetter. | ||
| View original record | R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. -4- EXPERIMENTAL REPORT. Expl. No. REF: Hs/ACL/LG15.1.25. Suggested reasons for the troubles, stated above, arising with the EAC. Carburetter. We may take the… | ||
| Scan26 | Carburetter modifications for increased power output compared to the 40/50 HP model. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -5- Expl. No. REF: Ha/ACL/LGTD.1.25. we have to supply a greater weight of charge per unit time than we do in the 40/50 HP. To accomplish… | ||
| Scan27 | Modifications made to an EAC carburetter for slow running. | ||
| View original record | R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -6- Expl. No. REF: Hs/ACL/1/M15.1.25. it would be necessary to modify the diaphragm ports and increase the size of the low speed throat… | ||
| Scan28 | Comparing a standard 40/50 HP carburetter with a converted EAC carburetter on an EAC engine. | ||
| View original record | R.R. 493a (50n) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -7- Expl. No. REF: Hs/ACL/LG15.1.25. standard 40/50 HP. carburetter with a higher lift to the air valve because it was found that when… | ||
| Scan29 | Graph comparing engine power output (BHP) versus RPM for different carburettors on an E.A.C. engine. | ||
| View original record | No 1 E.A.C. ENG. CARBURETTERS POWER OUTPUT WITH DIFFERENT CARBURETTERS E.A.C. ENGINE COMP'N RATIO 4 1/2 TO 1 STD. INDUCTION SYSTEM & STD. EXH. CUTOUT OPEN CURVES ARE CORRECTED FOR N.T.P. (760 M/M &… | ||
| Scan30 | Graph comparing carburetter mixture control performance under throttled light loads at various engine speeds. | ||
| View original record | No 2 METERING UNDER LIGHT LOADS. THROTTLED. BRAKE SET AT 2000 R.P.M. FULL LOAD. FOR EACH THROTTLE POSITION MIXTURE CONTROL IS ADJUSTED TO GIVE MAX. R.P.M. OF ENGINE. CARBURETTERS E.A.C. NOTE:- CURVES… | ||
| Scan31 | Graph comparing mixture control adjustments for various carburetters on an E.A.C. engine at full load. | ||
| View original record | NO. 3 CARBURETTERS E.A.C. E.A.C. & 40/50 CARBURETTERS ON E.A.C. ENGINE. ADJ. OF MIXTURE CONTROL TO GIVE CORRECT MIXTURE. FULL LOAD POSITION OF MIXTURE CONTROL GIVING WEAKEST MIXTURE WHICH WILL… | ||
| Scan32 | Graph plotting depression in the mixing chamber against R.P.M. for a standard and a converted carburettor. | ||
| View original record | No. 4 CARBURETTERS E.A.C. DEPRESSION IN MIXING CHAMBER. 40/50 CARB. ON E.A.C. 4.12 COMP. RATIO. DEPN. IN CARB. MIXING CHAMBER STD. 40/50 CARB. CONVERTED E.A.C. CARB. WITH 900 & 600 HIGH & LOW SPEED… | ||
| Scan34 | Investigations into the EAC carburetter. | ||
| 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 FN.EX. RG Expl. No. 18080 V2768 REF. Hsl/LG15.1.25 OBJECT OF TEST. INVESTIGATIONS ON EAC.… | ||
| Scan37 | Scheme to fix squeaking brakes on 20 HP cars by fitting dampers to the brake drums. | ||
| View original record | R.R. 493A (50n) (D.B. 175 25-9-24) J.H.D. ORIGINAL EXPERIMENTAL REPORT. Expl. No. REF: He1/LG20.1.25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wox. 20 HP. SQUEAKING BRAKES. 14257… | ||
| Scan38 | Arrangement of a rear brake damper and modified dust cover for the Goshawk II. | ||
| View original record | A SECTION THRO' B B ARRGT. OF REAR BRAKE DAMPER GOS II B MODIFIED DUST COVER SECTION THRO' A A 3 JUN 1937 DERBY EX. 135 | ||
| Scan39 | Test report on a 4-speed gearbox for 20 HP cars, detailing issues with gear disengagement and subsequent modifications. | ||
| View original record | VO ORIGINAL To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. AJS. c. to BY. Wox. Hs6/LG20.1:35. 4-SPEED BOX FOR 20 HP. CARS. V5310 We have been carrying out tests on the road wheel dynamometer with… | ||
| Scan40 | Gearbox testing, detailing damage to the reverse gear and other components after dynamometer and road tests. | ||
| View original record | contd :- -2- The car was run on the road wheel dynamometer for half an hour on 3rd. gear. half an hour on 2nd. gear. half an hour on 1st. gear, and half an hour on reverse - at maximum torque, 1000… | ||
| Scan41 | Replacement of damaged gears and testing arrangements for shaft deflection. | ||
| View original record | contd :- -3- damaged gears replaced. This time we are trying to arrange pointers coming to the outside of the box which we hope to measure where the shafts are deflecting or what tendency there is for… | ||
| Scan42 | Investigation into complaints of a sticking floating change speed lever on the 'V' series gearbox. | ||
| View original record | ORIGINAL S E C R E T. To R. From Hs. c. to C.J. BJ. c. to AJS. E. c. to BA. BY. ✓ c. to Wor. Hs3/LGH.1.25. {V} SERIES GEARBOX WITH SUBFRAME. X8310 X8380 We have had several complaints of the floating… | ||
| Scan44 | Wear issues and potential design improvements for the oil relay advance mechanism and magneto controls. | ||
| View original record | To R. from Hs. c. to CJ. BJ. c. to E. DA.✓ c. to BY.✓ Wor.✓ ORIGINAL SECRET. Hs1/LG23.1.25. EAC. 'V' SERIES. OIL RELAY ADVANCE. X8685 When the car is on the road, the oil relay advance is working the… | ||
| Scan45 | Tests conducted on 'B' type pedals. | ||
| View original record | R.R. 493A (50m) (D.B. 173 25-9-24) J.H.D. EXPERIMENTAL REPORT. -1- Expl. No. REF: TESTS OF 'B' TYPE PEDALS. A pressure of 48 lbs. was assumed as the load on the clutch pedal at a radius of 13.450"… | ||
| Scan46 | Page showing clutch pedal deflection and plate movement data in tables and a diagram. | ||
| View original record | R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Table 1. Pedal movement. | Plate movement. | Pedal movement. | Plate movement. 0 | 0 | 2.5" | .033" .5" | .002" | 3.0"… | ||
| Scan47 | The deflection of pedal shaft brackets, a connecting link pin, and an operating shaft lever. | ||
| View original record | R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: Fig.111. X MEMBER Rod to indicate clamped to brkt. on Cross member. The deflection of the pedal shaft brackets were… | ||
| Scan48 | The deflections of a clutch operating shaft under various loads. | ||
| View original record | R.R. 493A (50H) (D.B. 173 25-9-24) J.H.D. -4- EXPERIMENTAL REPORT. Expl. No. REF: The clutch operating shaft was then fixed upon a large bed-plate with bearings as in the clutch casing. The bearings… | ||
| Scan49 | Lost movement and deflection in a clutch pedal mechanism, with a supporting diagram. | ||
| View original record | R.R. 493A (50m) (D.B. 173 25-9-24) J.H.D. EXPERIMENTAL REPORT. -5- Expl. No. REF: .011" + .142" + .003 + .0025 = .158". This equal a lost movement at end of pedal plate of .810" and due to the pedal… | ||
| Scan50 | Page detailing deflection measurements of a lever and shaft assembly. | ||
| View original record | R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -5- Expl. No. REF: scribed lines was very small, whilst there was a big difference in the two scribed lines at the pin end of the lever.… | ||
| Scan51 | Test report on a 'USA' 4-speed gearbox, detailing overheating issues and subsequent modifications. | ||
| View original record | 20 4 SPD G/BOX DEPT QUICK RESULTS! ORIGINAL S E C R E T. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. AJS. c. to EY. Wor. Hs1/LG27.1.25. X5310 TESTS ON 'USA' 4-SPEED GEARBOX. We have carried… | ||