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 to the rear wheels and power available for hill climbing, accounting for tyre and transmission losses.
| Identifier | WestWitteringFiles\K\June1923\ Scan83 | |
| Date | 27th June 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. ----------------- . | ||