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).
Table of results showing rolling resistance at various speed drops.
| Identifier | ExFiles\Box 161\1\ scan0248 | |
| Date | 1st December 1938 | |
| -4- The following results were obtained - For the speed drop MPH. Rolling Resist. RT lbs/ton. K.{Mr Kilner} 85 - 80. 34.25 .0019+ 80 - 75 31.75 .00169 75 - 70 29.75 .00164 70 - 65 28.0 .00163 65 - 60 26.5 .00165 60 - 55 25.25 .001675 55 - 50 24.3 .001675 50 - 45 23.7 .00168 45 - 40 23.1 .00170 40 - 35 22.7 .001685 35 - 30 22.43 .00169 30 - 25 22.285 .00168 25 - 20 22.175 .00159 20 - 15 22.105 .00119+ + Readings unreliable due to difficulty of measuring high speed deceleration, and effect of smallest wind variation at low speeds. Front area 23.4 sq.ft. Tyre pressures 45 lbs/in2 Weight as tested 5292 lbs. 2.36 tons. | ||