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 petrol supply variation based on lift height, different fuel levels in the tank and vehicle gradient under full throttle conditions.
| Identifier | WestWitteringFiles\J\May1923\ Scan42 | |
| Date | 29th May 1923 | |
| AUTOVAC TESTS 40-50RR RR 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 8 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 SHEET 3 PINTS / HOUR AVERAGE ENGINE DEMAND APPROX DELIVERY AT ALTITUDE OF 10,000 FT WITH TANK 1/2 FULL No 6, No 1, No 2, No 3, No 4, No 5 H=21.4", H=22.5", H=26.45", H=30.6", H=41", H=53" RPM: 0, 250, 500, 750, 1000, 1250, 1500, 1750, 2000 M.P.H. TOP GEAR 15/52 AXLE: 14.38, 21.57, 28.76, 35.96, 43.14, 50.34, 57.5 M.P.H. 3RD GEAR 15/52 AXLE: 9.65, 14.47, 19.3, 24.13, 28.95, 33.77, 38.6 STAMP: ROLLS-ROYCE, LIMD PRINT ROOM 29 MAY. 23 | ||