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).
Increasing the 25HP propeller shaft diameter from 2.5 to 3 inches to prevent whirling.
| Identifier | WestWitteringFiles\V\March1931-September1931\ Scan084 | |
| Date | 25th March 1931 | |
| HS.{Lord Ernest Hives - Chair} DA.{Bernard Day - Chassis Design} ) FROM R.{Sir Henry Royce} E.{Mr Elliott - Chief Engineer} BY.{R.W. Bailey - Chief Engineer} ) (At Le CanadelHenry Royce's French residence.) C to SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} R1/M25.3.31. 25HP. PROPELLER SHAFT. x5340. I quite agree to the propeller shaft being increased in dia. from 2.5 to 3". Evidently the extra length alone was not the cause of the 2.5 original one whirling. Either we have to allow for definitely higher revs. or the shaft has been whirling for some time. R.{Sir Henry Royce} | ||