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 graph comparing present and proposed ignition advance curves against engine RPM for the Lighter Phantom to LEC 2230.
| Identifier | WestWitteringFiles\Q\2April1927-June1927\ 88 | |
| Date | 6th May 1927 guessed | |
| IGNITION ADVANCE FOR LIGHTER PHANTOM TO LEC 2230 (BOTH IGNITIONS BEING SYNCHRONISED) DEGREES ADVANCE ON FLYWHEEL A PRESENT COMPROMISE REQ'D CURVE 13° M&B 1° M M.1° 13° B M.1° B 23° B THIS CURVE IS BETTER FOR ANTI DETONATING REQ'D CURVE PROPOSED 10° M&B 2° M&B M 2° 8° B M 2° 16° B R.P.M. OF ENGINE | ||