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).
Comparative tests for high-speed steering wobbles using new well base rims and non-skid tyres.
| Identifier | ExFiles\Box 42\1\ Scan039 | |
| Date | 20th February 1926 | |
| File 43809 Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}2/LG20.2.26. HIGH SPEED STEERING WOBBLES. 457 Careful comparative tests of the high pressure well base rim and tyre with the new non-skid tread demonstrate that this tyre is definitely worse for high speed wobbles than the present standard straight sided core tyre with traction tread. The well base rim and tyre is stamped as a 6" section and fits 21" rims. Tests demonstrating the failings of this tyre were carried out on 9-EX. With the well base tyres at 40 lbs/sq.in. definite high speed wobbles were experienced at 60 m.p.h. with balanced wheels - no shock absorbers. No high speed wobbles were experienced with standard tyres under these conditions. In every case the wheels were balanced. Standard shock absorbers at 25 lbs/sq.in. succeeded in preventing wobbles building up with these well base tyres. The general impression left by the new tyres is that they made the steering heavier shunting and apparently much worse for road shocks at all speeds. If these were fitted as standard it would be clear that the customer would have nothing between him and the high speed wobbles except standard shock absorbers. Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer} | ||