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).
Comparative test report on the performance of Watford and Lucas magnetos at various speeds.
Identifier | ExFiles\Box 65\3\ scan0087 | |
Date | 27th July 1927 | |
For Mr. Clarke Tests on two Magnetos | MAGNETO | Low speed | High Speed | High speed with leak | |---|---|---|---| | | A | 30° | 60° | A | R | A | R | | WATFORD E.H.6. | 45 | 90 | 120 | 5,000 | 5,000 | Slight miss at 780 then OK to 5,000 | 5,000 | | LUCAS | 50 | 85 | 120 | Slight miss at 2,000 and cuts out entirely on one side above this speed. * | 5,000 | Slight miss at 1,200. very poor at all other speeds. ⓧ | 5,000 | * At 3000 R.P.M. magneto had to be retarded 30° to obtain regular sparking ⓧ At 1800 R.P.M. about 90° sparks missing. Low speeds on 5 3/8 gap. High " on rotary gap. set to same voltage as Both magnetos tested under similar conditions. 27 July 27 PHW | ||