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 automatic cam advance curve versus speed for a Scintilla AG6-H magneto.
| Identifier | ExFiles\Box 48\2\ Scan028 | |
| Date | 23th January 1929 guessed | |
| AUTOMATIC ADVANCE OF CAM WITH SPEED ON SCINTILLA MAGNETO TYPE AG6-H 21528 TABLE: AUTOMATIC RANGE " 32.5°, 22° ON ENGINE HAND RANGE " 17.5°, 11.5° " " TOTAL = 50°, 33.5° " " Y-AXIS: CAM ADVANCE (DEGREES) Scale Columns (left to right): Distributor: 14, 12, 10, 8, 6, 4, 2, 0 Engine: 28, 24, 20, 16, 12, 8, 4, 0 Magneto Armature: 42, 36, 30, 24, 18, 12, 6, 0 X-AXIS: DISTRIBUTOR SPEED (RPM) Scale Rows (top to bottom): Magneto Armature Speed: 0, 300, 600, 900, 1200, 1500, 1800, 2100, 2400, 2700, 3000, 3300, 3600, 3900, 4200, 4500 Engine Speed: 0, 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800, 2000, 2200, 2400, 2600, 2800, 3000 Distributor Speed: 0, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600 GRAPH ANNOTATIONS: R.R. COBHAWK DISTRIBUTOR MAGNETO OTHER: X.4187 | ||