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 causes of flywheel flutter and potential design solutions to minimise car vibration.
| Identifier | WestWitteringFiles\V\March1931-September1931\ Scan220 | |
| Date | 27th May 1931 | |
| HS.{Lord Ernest Hives - Chair} FROM R.{Sir Henry Royce} RECEIVED C. to SG.{Arthur F. Sidgreaves - MD} C. to WGR. C. to BY.{R.W. Bailey - Chief Engineer} 1931 MAY 29 R2/M27.5.31. filed. 8634. FLYWHEEL FLUTTER. We cannot expect to cure any of the present car vibration troubles entirely, and must work on minimising by a small percentage in several ways. Why P. 2. is better than the 25HP is probably due to the centre of gravity of the flywheel being nearer the centre of the bearing, and the flutter angle produces greater out-of-balance in the 25HP., hence, if true, the great advantage of moving the centre of gravity nearer the centre of the bearing. Balance weights and position of centre of gravity do not materially alter the periodicity, and if we wish to do so we must stiffen up the crankshaft and flywheel mounting, and get all we can out of making the mass lighter. As well as moving the rim of the flywheel nearer, which again will not affect the periodicity much, there is some of the flywheel which overhangs considerably but does not contribute much to the momentum. We have done all this in the designs. R.{Sir Henry Royce} | ||