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 increase of available plug voltage due to the increase of temperature for a Champion Sparking Plug, Type R-II-V, from a Falcon XI engine.
| Identifier | ExFiles\Box 35\4\ scan 011 | |
| Date | 19th March 1928 | |
| DRG.NO E.E.1669. Issued by:- Directorate of Technical Development. AIR MINISTRY DEPT. ELECTRICAL DRAWN S.G.A. TRACED L.E.B. 19.3.28 CHECKED H.F. APPROVED G.E.B. 19.3.28 S.P.402. E.E.1669. MAXIMUM MAGNETO VOLTAGE 10,000 VOLTS PEAK. VOLTAGE ON COOLING WAS 10,000. REGULAR SPARKING VOLTAGE. PLUG NO 4. TEMPERATURE t°C. FIG 2. CHAMPION SPARKING PLUG. TYPE R-II-V.{VIENNA} EX FALCON XI ENGINE. CURVE SHOWING THE INCREASE OF AVALABLE PLUG VOLTAGE DUE TO INCREASE OF PLUG EFFECTIVE RESISTANCE CAUSED BY INCREASE OF TEMPERATURE. | ||