Inquiring about modifications to the 20/25 HP gearbox to increase the bottom gear ratio.
| Identifier | ExFiles\Box 104\4\ scan0250 | |
| Date | 12th September 1935 | |
| Rm {William Robotham - Chief Engineer} To Hs {Lord Ernest Hives - Chair} /Gry. {Shadwell Grylls} X528 Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} 10/KW.12.9.35. 20/25 HP. Bottom Gear. Will you please let me know what modifications are necessary to the 20/25 gearbox to increase the bottom gear ratio by 16%, and whether there is any difficulty in getting this into the existing casting. Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} Present 1st speed ratio 39/17 Bentley - " " 38/18 gives 8% increase New 1st speed " 37/19 gives 16% " (D.P. unaltered) work so straight as to bot GRY {Shadwell Grylls} | ||
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).