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).
Power consumption data from dynamometer tests on various tyre sizes under different load and inflation conditions.
| Identifier | ExFiles\Box 159\1\ scan0383 | |
| Date | 10th November 1938 guessed | |
| Table 111. POWER CONSUMPTION HIGHFIELD DYNAMOMETER, MAXIMUM SCHEDULE CONDITIONS. COVERS CONDITIONED. Tyre Size Maximum Schedule load (on flat). CWT. Inflation Pressure. lbs/sq.inch. H.P. 30 m.p.h. ratio H.P. 70 m.p.h. ratio 5.50/18 11 36 1.3 100 3.65 100 6.50/16 11 1/4 30 1.45 111 3.82 105 6.50/17 15 40 1.53 118 4.35 119 7.00/18 17 40 1.8 138 5.5 Table 1V. POWER CONSUMPTION HIGHFIELD DYNAMOMETER, EQUAL LOAD COMPARISONS. SCHEDULE I.P. FOR LOAD CARRIED. COVERS CONDITIONED. 5.50/18 11 36 1.3 100 3.65 100 6.50/16 11 29 1.45 111 3.95 108 6.50/17 11 28 1.6 123 4.9 134 6.50/17 15 40 1.53 100 4.35 100 7.00/18 15 36 1.7 111 5.15 118 NOTE:- CASING TEMPERATURES 55 - 60°C DURING ALL TESTS. | ||