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).
The conclusion on the cause and potential reduction of flywheel vibration for the 25HP model.
| Identifier | ExFiles\Box 5\6\ 06-page077 | |
| Date | 20th October 1930 | |
| HS.{Lord Ernest Hives - Chair} FROM R.{Sir Henry Royce} HL/M20.10.30. X 5300 Copy to SG.{Arthur F. Sidgreaves - MD} NOR. BY.{R.W. Bailey - Chief Engineer} 25HP. FLYWHEEL VIBRATION. X.634. X.5300. We have concluded that this vibration will not vary directly with the overhang, but the energy of the vibration does depend upon the overhang and will be considerably reduced when the dimensions are reduced from about 3.5 to about 2.5, but we do not anticipate that the periodicity will be very much affected, being more dependent on the moment of inertia around the centre of vibration than the centre of gravity from the centre of vibration We hope that you will get the improved flywheel to L&C. 2831. fitted at the first possible moment, this being the best we can do until we alter the engine suspension. The bosses for the arms will then be removed when the flywheel will be pushed on up to bearing bolt bosses. It has occurred to me that we might go still slightly futher by adopting studs in this main bearing. H.{Arthur M. Hanbury - Head Complaints} | ||