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).
To the Technical Committee regarding standard axle gear ratios for cars with different body weights.
| Identifier | ExFiles\Box 2\6\ B002_X 140 141 157-page196 | |
| Date | 5th March 1912 | |
| COPY. R.R. 1024 (100-1-12) C.P.P. 36. 20.12.11 G 1929 Le CanadelHenry Royce's French residence, 5th March 1912. X/U/ C.J. and Technical Committee. Axle ratio. No car should be turned out with a higher gear ratio than 3 to 1, i.e. the 24 tooth gear or its equivalent in coarse pitch axle should be abandoned. It is desirable that for heavy bodies the gear should be about 3.3 to 1 ratio and that the lightest bodies should be as near as possible 3 to 1 ratio. With worm axles these ratios should be increased by from 5 to 10% owing to the less efficiency of this gearing. F.H.R. | ||