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 showing the required ignition advance curves for the 20HP engine.
| Identifier | ExFiles\Box 37\1\ scan 276 | |
| Date | 27th August 1924 | |
| 20.HP. CURVES SHOWING THE IGNITION ADVANCE REQUIRED ON R.R. 20HP ENGINE. (FIGURES SUPPLIED BY H.R.) 3.2.22 THESE CURVES DEFINE THE LIMITS OF IGNITION RANGE, AS EXPERIMENTALLY DETERMINED, OVER WHICH MAXIMUM POWER IS PRACTICALLY MAINTAINED AT EACH SPEED. MAXIMUM MINIMUM ENGINE DEGREES. B.D.C. A.D.P. ENGINE SPEED R.P.M. NEW SUPPLY E.7.C. 27/8/24 | ||