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).
Graph from Autovac tests showing the calculated distance possible to travel at full throttle in top gear.
| Identifier | ExFiles\Box 40\4\ Scan067 | |
| Date | 9th May 1923 | |
| SHEET 2 AUTOVAC TESTS DISTANCE POSSIBLE TO TRAVEL STARTING WITH AUTOVAC & FLOAT CHAMBER OF CARB. FULL FULL THROTTLE. TOP GEAR. ACTUAL RESULTS WOULD BE BELOW THESE CALCULATED RESULTS. IT IS ASSUMED FOR THESE RESULTS THAT THE LEVEL OF PETROL IN TANK IS CONSTANT & THE MILAGE IS THAT WHICH CAR WOULD DO, IF SUPPLY IN MAIN TANK LASTED, CALCULATED UPON AVERAGE ENGINE DEMAND. Y-AXIS: MILES POSSIBLE TO TRAVEL ON TOP GEAR X-AXIS: R.P.M. / M.P.H. TOP GEAR 0, 250, 500, 750, 1000, 1250, 1500, 1750, 2000 R.P.M. 14.38, 21.57, 28.76, 35.96, 43.14, 50.34, 57.5 M.P.H. TOP GEAR UPPER CURVE DATA: Nº1 Nº2 TANK 1/2 FULL TANK APPROX 3/4 FULL INFINITY AT 750 TANK FULL INFINITY AT 750 Nº6 TO INFINITY AT 1100 R.P.M TO INFINITY AT 1500 R.P.M LOWER CURVE DATA: Nº3 Nº4 Nº5 ON LEVEL. TANK NEARLY EMPTY. GRAD 1 IN 8 TANK NEARLY EMPTY GRAD 1 IN 4 TANK NEARLY EMPTY STAMP: ROLLS-ROYCE LTD DERBY PRINT ROOM 9 MAY. 23 | ||