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).
Standard ignition timing specifications for the Goshawk engine.
| Identifier | ExFiles\Box 37\1\ scan 238 | |
| Date | 24th November 1922 | |
| X.3949 EFC/T24.11.22. X.3485 - GOSHAWK IGNITION - STANDARD TIMING X.928. X.3949. The hand advance allows for 20º advance on the distributor or 40º on the engine. The automatic advance is 15º on the distributor, 30º on the engine. With both ignitions retarded, firing occurs 26º after dead point. With both ignitions fully advanced it occurs 44º before dead point. EFC. | ||