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 of ignition advance curves for different Phantom engine configurations against engine RPM.
| Identifier | ExFiles\Box 54\5\ Scan304 | |
| Date | 25th October 1928 guessed | |
| NECESSARY IGNITION ADVANCE FOR PHANTOM FLYW'L DEGREES ADVANCE BEF T.D.C STD. PHANTOM (SINGLE IGNITION) TURBULENT HEAD SINGLE IGNITION DUAL IGNITION R.P.M. OF ENGINE. Y-AXIS: 10°, 20°, 30°, 40°, 50° X-AXIS: 500, 1000, 1500, 2000, 2500, 3000 | ||