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).
Graph of ignition advance curves versus engine speed for an S.A.C. engine, with Hispano engine curves for comparison.
| Identifier | ExFiles\Box 37\1\ scan 257 | |
| Date | 31th March 1924 | |
| IGNITION CURVES. CURVES 1. 2. 3. S.A.C. ENG. MEAN POSNS FOR MAINTAINING OUTPUT. HISPANO CURVES FOR COMPARISON. DEGREES ADVANCE. REVS/MIN. BATTERY (1) ONLY MAG ONLY (2) BOTH IGNS. (3) HISPANO 1 PLUG HISPANO 2 PLUGS. SHK/241/64 31-3-24. | ||