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).
Page describing the reduction ratio and performance of a starter motor.
| Identifier | ExFiles\Box 51\2\ Scan165 | |
| Date | 19th November 1923 | |
| Contd. -5- EFC {E. Fowler Clarke - Electrical Engineer} 5/T19.11.23. The reduction ratio between starter motor and engine is 8.4. The starter motor when rolling the engine cold takes from the battery a current of 115 amperes at about 9.7 volts on the motor terminals, and turns the engine at 120 r.p.m., the motor itself operating at a torque of 50 lb-inches. N.B. The exact speed of rolling the engine of course depends a great deal on temperature conditions. 1804 EFC. {E. Fowler Clarke - Electrical Engineer} MADE AT CROXLEY | ||