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).
Tyre dimensional errors comparing dynamometer testing to real-world road conditions.
| Identifier | ExFiles\Box 4\3\ 03-page49 | |
| Date | 9th October 1925 | |
| - 2 - BY11/H.{Arthur M. Hanbury - Head Complaints} 9.10.25. When running the tyre on the dynamometer, drum, one has a perfect running surface for the tyre to work upon, consequently the slightest dimensional error tends to produce some regular impulsive action on the axle, whereas since the road is full of inequalities of the same dimension as the errors we are discussing, the likelihood of building up on the road, in my opinion, is very remote indeed, when speaking of the effects of dimensional errors in tyres. It is pretty clear that the dimensional bogey does not exist for high pressure tyres used on ordinary roads, and since we have a prohibition on the use of balloon tyres for front wheels, it appears to me that we have put ourselves in the safest possible position even under present circumstances, and that to go further would make us appear ridiculous and impracticable in the eyes of manufacturing tyre companies. BY.{R.W. Bailey - Chief Engineer} | ||