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).
Tests on hydraulic dampers and tyres to eliminate vehicle wobbles.
| Identifier | WestWitteringFiles\O\2January1926-March1926\ Scan73 | |
| Date | 1st February 1926 guessed | |
| contd :- -2- hydraulic dampers would cope with the wobbles set up by these tyres. We then tried 7.25" tyres at 20 lbs/sq.in. We found that we were unable to eliminate the wobbles produced by these tyres. As a matter of fact the violence of the wobbles was only slightly reduced by the dampers. This confirms our previous experience with these particular tyres, either the wobble is eliminated or it is present in a violent form. All the wheels in these tests were balanced and the shock absorbers loading was 150 lbs. on the ball end upwards, and 30 lbs. downwards. We have yet to make careful comparative tests for riding comfort. We still believe, however, that we shall gain more from the reduced tyre pressures than we shall lose from the heavy shock absorber damping employed. We are trying to see to what extent the loading employed can be reduced without decreasing the efficiency of the dampers. Hs{Lord Ernest Hives - Chair}/W.A.Robotham. | ||