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).
The gear reduction ratios for the EAC.II starter motor.
| Identifier | ExFiles\Box 64\1\ scan0191 | |
| Date | 29th September 1924 | |
| x7620 EFC/T29.9.24. X.8620. X.8640. EAC.II. STARTER MOTOR REDUCTION GEAR. The epicyclic reduction gear of the motor gives a reduction from 9 to 2. The reduction from the motor pinion to engine flywheel is 65 to 9. Hence the total reduction from motor to engine is 65 to 2, i.e. 32.5 to 1. EFC. | ||