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).
Modifications to the servo and speedometer drive for the Wraith Gearbox.
| Identifier | ExFiles\Box 8\11\ 11-page013 | |
| Date | 21th November 1934 | |
| 4109 628 To BY from HDY.{William Hardy} c. Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} Hs.{Lord Ernest Hives - Chair} Da{Bernard Day - Chassis Design}, REC, Hs{Lord Ernest Hives - Chair}/Wst. Wraith Gearbox. N. Sch.4268 herewith shows modifications to the servo and speedometer drive, to reduce the speed of the servo in accordance with our Hdy.{William Hardy}1/HP.8.11.34. The servo gears are 2/21 and the speedometer gears 22/9 giving 685 revs. per mile with the existing Bentley axle ratio of 4.1 to 1 and 810 revs. per mile with an axle of 5:1 which is, we imagine, the lowest ratio that is likely to be required. HDY.{William Hardy} | ||