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).
Friction losses and the rolling resistance of fabric and cord tyres.
| Identifier | ExFiles\Box 113\2\ scan0013 | |
| Date | 11th January 1923 guessed | |
| -2- (b) Friction losses due to engine vary directly as speed i.e., F at 20 m.p.h. = ½ F at 40 m.p.h. (c) At 20 m.p.h. Tr.{Capt. F. W. Turner - Finance} resistance due to engine is almost equal to that of the chassis. Tyre resistance. The rolling resistance of fabric tyres can be increased 50% when the pressure is dropped from 90 - 30 lbs.sq.ins. 25% when dropped to 50 lbs. per sq.ins. The rolling resistance is independent of the speed for tyres (approx.) Cord tyres. These show approx. 2/3 rolling resistance of fabric tyres. The rolling resistance does not increase so rapidly with deflation. [Watermark: COMMONWEALTH] [Watermark: MADE AT CROXLEY] | ||