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).
Dynamometer ignition advance curves for 7-1 R.C. pistons at various engine speeds.
| Identifier | ExFiles\Box 97\5\ scan0196 | |
| Date | 1st June 1939 guessed | |
| B.V. DYNAMOMETER IGNITION ADVANCE CURVES. 7 - I R.C. PISTONS. FIG. III B.H.P. DEGREES ON FLYWHEEL. B.T.D.C. Top-Left Chart (1600 R.P.M.): T.D.C. LOSS NIL 4° LATE 0.25 H.P. LOSS 8° LATE 1.1 H.P. LOSS Top-Right Chart (3200 R.P.M.): 4° LATE LOSS NIL 8° LATE 0.4 H.P. LOSS T.D.C. 1 H.P. LOSS Bottom-Left Chart (800 R.P.M.): T.D.C. 0.5 H.P. LOSS 4° LATE 1.6 H.P. LOSS 8° LATE 3.1 H.P. LOSS Bottom-Right Chart (2400 R.P.M.): 4° LATE LOSS NIL 8° LATE 0.3 H.P. LOSS T.D.C. LOSS NIL LOSSES WITH FINAL GOVERNOR CURVE SHOWN FOR EACH SPEED | ||