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).
Page detailing causes, palliatives, and cures for steering and suspension issues like low-speed wobble and high-frequency fight.
| Identifier | ExFiles\Box 170\3\ img020 | |
| Date | 25th February 1936 guessed | |
| -8- (5) A natural frequency of 400 a minute definitely causes low speed wobble, but this is easily damped out by a little friction in the steering mechanism. (6) Palliatives for high frequency fight are - Friction in steering mechanism (preferably at or near the kingpins). Damping effect of shock absorbers (best results are obtained with shocks rigidly mounted and rigidly connected to the wheels). Stiff frames. (7) Dubonnet suspensions in which the masses which swing about the kingpins are large (approx. twice as large) have an inherent tendency to low frequency wheel fight at about 400 a minute, which is a close relative of true low speed wobble. (8) Known cures for this are :- Friction in steering mechanism. Reduced caster. Tuning the natural frequency of the engine on its rubber mounts to 400 a minute. Moving the center of the wheel as nearly as possible vertical as it moves up and down. Stiffening the steering mechanism. | ||