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).
Blueprint comparing ignition advance curves for the Lighter Phantom model up to LEC 2230.
| Identifier | ExFiles\Box 37\1\ scan 309 | |
| Date | 6th May 1927 guessed | |
| IGNITION ADVANCE FOR LIGHTER PHANTOM TO LEC 2230 (BOTH IGNITIONS BEING SYNCHRONISED) DEGREES ADVANCE ON FLYWHEEL PRESENT COMPROMISE REQD CURVE THIS CURVE IS BETTER FOR ANTI DETONATING PROPOSED R.P.M. OF ENGINE A B 10° 20° 30° 40° 500 1000 1500 2000 2500 13° M&B 1° M M1° 13° B M1° B 23° 10° M&B 2° M&B M2° 8° B M2° 16° B | ||