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).
Crankshaft vibration, dampers, and flywheel placement for a 6-cylinder engine.
| Identifier | WestWitteringFiles\V\March1931-September1931\ Scan130 | |
| Date | 20th April 1931 guessed | |
| (3) elasticity, and arranged with extra weights to increase by centri-fugal loading as found good by experiment. But even with best dry surface and friction increasing with speed the crankshaft must vibrate or the damper does not act. Is this not so? (Mr. Ricardo thought our trouble was the whirling flywheel, and remarked that by far the smoothest 6 cyl. engine he had had experience of was that with the flywheel in the centre, which I have since thought is what we ought to use if we go on with 6 cyls.) The actual trouble from want of perfect balance or variation in kinetic energy in the pistons is extremely small and would move the engine only a microscopic amount. I had made up my mind to ask Mr. Tresilian or Mr. Grylls to find this quantity but have since decided that it is proved by the smoothness at 45 MPH. (1700 RPM.) so that the swing at the worst harmonic must increase this 100 times. R.{Sir Henry Royce} | ||