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).
Propeller shaft modifications to address vibrations in the 20/25 HP model.
| Identifier | ExFiles\Box 137\4\ scan0085 | |
| Date | 1st September 1930 | |
| Hs.{Lord Ernest Hives - Chair} ) From Da.{Bernard Day - Chassis Design} Ev.{Ivan Evernden - coachwork} ) c. Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} X634 Da{Bernard Day - Chassis Design}2/M1.9.30. X.634 X.5340 20/25 HP. VIBRATIONS. With reference to Hs{Lord Ernest Hives - Chair}2/MJ8.9.30. R.{Sir Henry Royce} instructs that we should try an increased diameter propeller shaft, if possible slightly thinner. Would Derby please therefore obtain a shaft 2.5 outside diameter, and if possible .092 (13 SWG. thickness). We believe that it is quite possible to get swaged ends thicker than the central part of the tube. This would raise the theoretical whirling speed from 3720 to 4180. which we should expect would be a sufficient margin. It may be necessary to increase slightly the set in the cross member between the front end of the rear spring. Da.{Bernard Day - Chassis Design} | ||