From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Comparative tests of R.R. and C.A.V. starting equipment.
| Identifier | WestWitteringFiles\H\March1922\ Scan35 | |
| Date | 13th February 1922 | |
| To R & E.{Mr Elliott - Chief Engineer} from EFC. c. to CJ. c. to By.{R.W. Bailey - Chief Engineer} c. to Hm.{Capt. W. Hallam - Head Repairs} c. to EP.{G. Eric Platford - Chief Quality Engineer} ORIGINAL EFC2/T13.2.22. Y4296 x3082 x4741 COMPARATIVE TESTS OF R.R. STARTING EQUIPMENT, COMPRISING P & R TYPE E.D.11 BATTERY; 27' OF 84/25's CABLE; R.R. ELECTRICALLY OPERATED MAIN SWITCH AND ACTUATOR BOX; & R.R. STANDARD 40/50 STARTER MOTOR. with EQUIPMENT FITTED TO CHASSIS 2106, COMPRISING C.A.V. WILLARD 12XR-4 BATTERY; THE EQUIVA- LENT OF 17' OF 147/25's CABLE; AND C.A.V. TYPE "ZB" MOTOR WITH SPECIAL C.A.V. ELECTRICALLY OPERATED ENGAGEMENT, DIRECT GEARED TO FLYWHEEL. Tests were made on the two chassis, after these had been standing out all night, the water temperatures being round about 0°C in the R.R. case and 5.5°C in the C.A.V. case. On the C.A.V. equipped car, the quantities to roll the engine (cold) were as follows :- Average volts - Battery 9.65 Motor 9.16 " amps. 168 Engine revs. 50 r.p.m. Motor revs. 546. Reduction ratio.10.92 to 1 The quantities were then retaken, but in this case the side shaft was not being driven. The quantities were then:- Amperes 164. Volts. Battery 9.60. Motor 9.12. Engine revs. 50 r.p.m. Motor revs 546. Similar results were then taken on 1 EX car, the average of two results being :- Volts Battery 9.45 Motor 8.48 Amperes. 120 Engine revs. 36 r.p.m. Motor revs. 840. Contd. | ||