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).
Requesting the speedometer drive ratio for an EAC.10 gearbox, with handwritten ratio calculations.
| Identifier | ExFiles\Box 66\4\ scan0245 | |
| Date | 7th December 1927 | |
| Please File To BY/SS.{S. Smith} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} X8310 Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}3/LG7.12.27. We understand that the speedometer drive ratio in EAC.10 gearbox is different to the present standard. We should be obliged if you will let us know what/ratio is so that we can order up a speedometer for the car. Gearbox Ratio. Nsch.2452. 2/18 x 24/10 = 4/15 Rear Axle Ratio? Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||