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 whirl, vibration, and proposed design modifications to address these issues.
| Identifier | ExFiles\Box 179b\1\ img034 | |
| Date | 24th August 1932 | |
| CONFIDENTIAL ORIGINAL MESSAGE HS.{Lord Ernest Hives - Chair} ) FROM R.{Sir Henry Royce} H.{Arthur M. Hanbury - Head Complaints} ) S. to BG. WOR.{Arthur Wormald - General Works Manager} DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} PN.{Mr Northey} R1/W24.8.32. X 1 34 I am satisfied that as propeller shafts whirl about 30% below our calculated speeds, that there is no mystery or secondary effect to account for vibration, and since it is impractical to increase the diameter much above 2.750" we must shorten the distance between the universals to about 45". Bensport is to have a separate gearbox, and the Peregrine extension something like Hispano. Make experimental rig to confirm whirling speeds. R.{Sir Henry Royce} | ||