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).
Two graphs showing ignition curves for the Lighter Phantom engine.
| Identifier | ExFiles\Box 69\4\ scan0327 | |
| Date | 5th October 1926 | |
| TOP GRAPH: 1000 R.P.M. B.M.E.P. = .705 x lbs LIFT Y-AXIS: lbs LIFT ON DYNO' X-AXIS: IGN. ADVANCE DEGS BEFORE T.D.C LEGEND: ◎ ----- SYNCHRONISED IGNITIONS. x - - - SINGLE IGN CARB SIDE. △ - - - SINGLE IGN. DYNAMO SIDE. ANNOTATIONS: SYN IGN 27° MIN SINGLE CARB SIDE 32° MIN SINGLE DYNAMO SIDE 36° MIN BOTTOM GRAPH: Y-AXIS: lbs LIFT ON DYNO' X-AXIS: IGN ADVANCE. LEGEND: ◎ ----- SYN. IGNITIONS x - - - SINGLE IGN CARB. SIDE OF ENG. ANNOTATIONS: SYN. IGNS 15° MIN CARB SIDE SINGLE IGN 20°. DOCUMENT TITLE: IGNITION CURVES FOR LIGHTER PHANTOM. | ||