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).
Skidding experiments and performance tests of modified silent tread tyres.
| Identifier | ExFiles\Box 45\2\ Scan257 | |
| Date | 3rd August 1930 | |
| To R.{Sir Henry Royce} From He/Rn.{Mr Robinson} c. to Sg.{Arthur F. Sidgreaves - MD} C. c. to PN.{Mr Northey} HY.{Tom Haldenby - Plant Engineer} c. to L. Ds. Y4050 He/Rn.{Mr Robinson}1/MJ.3.8.30. Y4050 Y7828 Y7960 SILENT TREAD TYRES. ==================== We are sending to London today, a pair of modified silent tread tyres. The Dunlop Rubber Co. have been working for the past year on the problem of improving the safety of the silent tread tyre. They have built a special piece of road and carried out a great number of skidding experiments. Briefly, the results they have obtained are as follows:- That on surfaces which produce tyre noise there is less than 20% difference in the efficiency of the Triple Stud tyre and the perfectly plain tyre. They say that the reason for this is that the edges of the tyre have very little to get hold of and the final grip of the tyre approximates to the coefficient of friction of wet rubber on tar macadam. Actually, in tests they conducted while we were there, they proved that the R.R. silent tread tyre only increased the stopping distance in a forward direction by about 4% under the worst possible conditions. Its sideways grip was as good as that of the Triple Stud tyre. On un-metal roads there is no question that the pattern of the tyre tread has a tremendous effect on the grip which the wheels can obtain, but under these conditions the question of noise does not arise, and the Triple Stud tyre would | ||