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 rolling resistance in relation to pressure and speed.
| Identifier | ExFiles\Box 158\1\ scan0223 | |
| Date | 12th October 1938 guessed | |
| -2- It is interesting to note that at the highest pressure, 40 lbs/in2, the smaller tyre gives a lower rolling resistance, for its rated load, but that at the lower pressures the larger tyre gives lower resistances; in view of the small amount of these differences they may however be due to experimental inaccuracies. It appears to be quite definite that rolling resistance does increase with speed, and when further experimental figures at higher speeds are available it may be possible to decide whether the "Société Continentale" formula is correct or whether a linear relationship with speed is more nearly accurate. Da{Bernard Day - Chassis Design}/DB.{Donald Bastow - Suspensions} [Signature] | ||