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 an American standard and an R.R. standard starter motor cable on a 4EX chassis.
| Identifier | ExFiles\Box 168b\2\ img067 | |
| Date | 7th October 1921 | |
| X802 EFC. PB.21. October 7th 1921. X.802. STARTER MOTOR CABLE TESTS ON 4EX. X.1058. X.1195. Comparative tests were made on two different cables for the starter motor circuit. 1. An R.R. standard cable. 2. A heavy cable sent over from America (American std) Average temperature of engine = 23.15°C Below are given the corrected results. American Cable. Battery volts. Motor volts. Amperes. Engine Revs. Cable Resistance. Remarks. 9.83 9.20 173.0 92 .00364 9.73 9.15 177.2 100 .00327 9.73 9.15 181.3 84 .00320 R.R. standard cable. Battery Volts. Motor Volts. Amperes. Engine revs. Cable Resistance. Remarks. 9.83 8.30 171.0 82 .00895 9.79 8.30 168.9 82 .00883 9.83 8.30 166.9 84 .00918 Battery used was Willard S.J.R.G.28 with Bijur starter motor. The main switch alone was included in the circuit it being actuated by current taken from the battery, through a push button switch, by separate cables. C.A.P. | ||