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).
Chart from Autovac tests showing the variation of petrol supply with height, fuel level, and vehicle gradient.
| Identifier | ExFiles\Box 40\4\ Scan069 | |
| Date | 1st May 1923 guessed | |
| AUTOVAC TESTS SHEET 3 40-50 R.R. R.R. CARB. & STANDARD INDUCTION PIPE CHART SHOWING VARIATION OF PETROL SUPPLY WITH THE HEIGHT THRO WHICH IT HAS TO BE RAISED FROM PETROL TANK CAUSED BY DIFFERENT LEVELS OF FUEL IN TANK. ALSO EFFECT OF GRADIENT FULL THROTTLE CONDITIONS No 6 CAR ON LEVEL 11" PETROL IN TANK No 1 CAR ON LEVEL 9.95 PETROL IN TANK No 2 CAR ON LEVEL 6" PETROL IN TANK No 3 CAR ON LEVEL 1.85 PETROL IN TANK No 4 CAR ON 1 IN 6 GRADIENT 1.85 PETROL IN TANK No 5 CAR ON 1 IN 4 GRADIENT 1.85 PETROL IN TANK S.P. GRAVITY OF PETROL USED 0.752 CHAIN DOTTED CURVE IS AVERAGE ENGINE DEMAND H = HEIGHT THRO' WHICH PETROL HAS TO BE RAISED Y-Axis: PINTS / HOUR X-Axis: R.P.M. Plot Lines: No 6 No 1 No 2 No 3 No 4 No 5 AVERAGE ENGINE DEMAND APPROX: DELIVERY AT ALTITUDE OF 10.000 FT WITH TANK 1/4 FULL Data Points: H=21.45" H=22.5" H=24.45" H=36.6" H=41" H=53" Bottom Table: M.P.H. TOP GEAR 15/52 AXLE: (at 500 RPM) 14.38, (750) 21.57, (1000) 28.76, (1250) 35.96, (1500) 43.14, (1750) 50.34, (2000) 57.5 M.P.H. 3RD GEAR 15/52 AXLE: (at 500 RPM) 9.65, (750) 14.47, (1000) 19.3, (1250) 24.13, (1500) 28.95, (1750) 33.77, (2000) 38.6 Bottom Right: ROLLS-ROYCE LTD PRIVATE DERBY | ||