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).
Experiments with shimmy shackles and engine mounts to address wheel fight issues.
| Identifier | ExFiles\Box 170\3\ img027 | |
| Date | 5th June 1935 guessed | |
| -4- (8) Shimmy Shackle. So far we have not been able to produce on wishbones any effect comparable with that of the shimmy shackle on front axles. Theoretically this lowers the flap frequency by increasing the flexibility and by simultaneously increasing the oscillating mass. We shall go on trying for this effect. (9) Engine Mount. When an engine is correctly mounted for "balancer action", and when the car is running on cams at the frequency which shows max. fight of the steering wheel, blocking the engine will show a violent build up of wheel fight, and releasing the engine will show a great reduction of wheel fight. This seems an effective way of reducing wheel fight in the low frequency range. The only car to do this successfully in the higher frequencies is the Chrysler 6, and in this case the engine motion is so violent as to shake the car. To get this action it is essential that the engine and the steering mechanism should be tuned close to the same frequency. (Sgd.) M.{Mr Moon / Mr Moore} Olley. | ||