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).
Curve showing the horsepower required to drive a 40/50 HP car up a 1 in 12 gradient.
| Identifier | ExFiles\Box 38\2\ Scan233 | |
| Date | 11th September 1924 guessed | |
| SHEET 2. CURVE SHOWING HP. REQ TO DRIVE 40/50 HP. CAR UP A 1 IN 12 GRADIENT WT. OF CAR ASSUMED TO BE 2 TON. THE CURVE SHOWING POWER REQUIRED IS CALCULATED FROM FIGURES OBTAINED FOR THE TRACTIVE RESISTANCE OF A 40/50 HP CAR. THE PERCENTAGE OF FULL LOAD UNDER WHICH THE ENG. IS WORKING AT DIFFERENT SPEEDS & ON VARIOUS GEAR RATIOS CAN BE OBTAINED. EXAMPLE:- SPEED 20 M.P.H. 3RD GEAR. %OF FULL LOAD ON ENG. = EG / EC = 59% HORSE POWER MILES/HOUR Graph Labels: HP REQUIRED TO DRIVE CAR UP A GRADIENT OF 1/12. HP AT WHEELS TOP GEAR HP AT WHEELS 3RD GEAR HP AT WHEELS 2ND GEAR Bottom Axis Labels: ENG. R.P.M TOP GEAR ENG. R.P.M 3RD. GEAR ENG. R.P.M 2ND GEAR aebs | ||