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).
Vehicle wobbles, suspension qualities, tyre types, and hydraulic dampers.
| Identifier | ExFiles\Box 55\3\ Scan264 | |
| Date | 29th September 1926 guessed | |
| contd :- -3- complaints are made. We have however detected the slightest improvement with the front spring shackle at the rear. We are in agreement that weight concentrated over the axles give better riding on R-R cars. We find that cars such as the Lancia owe their suspension qualities in the back, to the fact that they carry their two xxxx spare wheels overhung some 4 ft. from the back axle. In connection with hydraulic dampers and wobbles. We have recently come to the conclusion as to the result of numerous tests, that 6.75" Dunlop balloon tyres are less prone to wobble than 6" tyres when both casings contain the same number of plies, and both tyres are fitted on the same rims. Our theory at the moment is that the greater the flywheel effect on the wheel and tyre, the greater the resistance this sets up for wobbles, provided the transverse moment of inertia of the axle is not increased at the same time. We are carrying out some tests to confirm this, but should be interested to have any views you may have on the subject. Attached is a blue print of the latest we know of in hydraulic dampers. We are not sure what state the dampers had got to when the pair were despatched to you, and fear they may now be a trifle obsolete. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||