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).
Page of calculations for power delivery, tractive resistance, and hill climbing for 40/50 HP and 20 HP models.
| Identifier | ExFiles\Box 113\2\ scan0041 | |
| Date | 2nd July 1923 guessed | |
| -2- Power delivered to rear wheels allowing for rear tyre losses and transmission losses :- 40/50 HP. = 54.8 X gear ratio. 20 HP. = 37.71 X " " Allowing 50 lbs. per ton as an average tractive resistance for a good surface and assuming that the rear tyres which we have taken into account are responsible for 20 lbs. per ton. Power available for hill climbing :- 40/50 = (54.8 X gear ratio) 30 lbs.per ton. 20 HP. = (37.71 X " " ) 30 lbs.per ton. ----------------------------- | ||