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).
Specifying the standard ignition timing for the Goshawk engine.
| Identifier | ExFiles\Box 54\5\ Scan223 | |
| Date | 24th November 1922 | |
| V3485 EFC {E. Fowler Clarke - Electrical Engineer} /T24.11.22. X. 3485 - GOSHAWK IGNITION - STANDARD TIMING X.928. X.3949. The hand advance allows for 20° advance on the distributor or 40° on the engine. The automatic advance is 15° on the distributor, 30° on the engine. With both ignitions retarded, firing occurs 26° after dead point. With both ignitions fully advanced it occurs 44° before dead point. EFC. {E. Fowler Clarke - Electrical Engineer} | ||