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 comparing the petrol delivery of a Phantom II feed system with and without a non-return valve, measured against engine RPM.
| Identifier | ExFiles\Box 64\1\ scan0056 | |
| Date | 1st March 1930 guessed | |
| PHANTOM II. PETROL FEED SYSTEM. EFFECT OF NON-RETURN VALVE IN PETROL PIPE FROM REAR TANK TO AUTOVAC. (REAR TANK FULL) STANDARD SYSTEM: _________ STANDARD SYSTEM WITH NON RETURN VALVE: _ _ _ _ _ PETROL DELIVERY (PTS/HOUR) 100 90 80 70 ENGINE R.P.M. 500 750 1000 1250 1500 1750 2000 | ||