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).
Diagram illustrating the battery and magneto ignition advance for a Goshawk engine.
| Identifier | ExFiles\Box 37\1\ scan 249 | |
| Date | 1st November 1933 | |
| X3485 X3949 Battery Ignition advance. (Fully advanced automatically) Advance allowed by rotor blade (Full automatic retard) Advance Magneto Battery Ignition advance. (Fully retarded automatically) B.D.P. A.D.P. Retard Advance Ignition Lever Travel GOSHAWK BATTERY & MAGNETO IGNITION DIAGRAM E.F.C. Novr. 1933 | ||