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 governor advance curves for a 25 HP GOS. C.5 engine.
| Identifier | ExFiles\Box 163\7\ img202 | |
| Date | 1st November 1932 guessed | |
| 25 H.P. IGNITION GOVERNOR - ADVANCE CURVES. HS.{Lord Ernest Hives - Chair} 714 ENGINE GOS. C.5 (CAST IRON TURBULENT HD.{Mr Hayward/Mr Huddy} 6.3:1 C.R.) SINGLE S.U. CARBURETTER. (.1875 DIA. THROTTLE.) CURVE ① IDEAL LINE. (MINIMUM ADVANCE FOR MAXIMUM POWER.) ② ACTUAL ADVANCE. (STANDARD WTS. & SPRINGS) ⑦ SPRINGS 9 COILS 16 S.W.G. LEAD WTS. SPRINGS SET TO JUST RETURN WTS (23° AUTO. ADV) IGNITION ADVANCE (DEGREES BEFORE T.D.C.) R.P.M. 5% DROP ADVANCED. 5% DROP RETARD | ||