Graph of regular sparking voltage versus temperature for a Champion R-II-V sparking plug from a Falcon XI engine.
| Identifier | ExFiles\Box 35\4\ scan 010 | |
| Date | 19th March 1925 | |
| DRG.NO E.E.1668. Issued by: Directorate of Technical Development. AIR MINISTRY DEPT. ELECTRICAL DRAWN S.D.Q. TRACED L.E.B. 19.3.24 CHECKED [Signature] APPROVED G.E.B. 19.3.25 MAXIMUM MAGNETO VOLTAGE 10,000 PEAK. REGULAR SPARKING VOLTAGE. VOLTAGE ON COOLING WAS 10,000. PLUG. NO 2. FIG.1. TEMPERATURE. t °C. CHAMPION SPARKING PLUG. TYPE R-II-V. {VIENNA} Ex FALCON(Aero Engine) XI ENGINE. CURVE SHOWING THE INCREASE OF AVAILABLE PLUG VOLTAGE DUE TO INCREASE OF PLUG EFFECTIVE RESISTANCE CAUSED BY INCREASE OF TEMPERATURE. E.E.1668. S.P.402. | ||
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).