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).
Test results report for various magnetos against general specifications, without automatic advance.
| Identifier | ExFiles\Box 4\5\ 05-page345 | |
| Date | 23th November 1925 | |
| X430. MAGNETO TESTS TO GENERAL SPECIFICATION. (NO AUTOMATIC ADVANCE) | Date. | Magneto. | Type. | (1) Weight (LBS). | (2) H.T. gap (mm). +4-8.5 | (3) Firing range +/- 2.5º | (4) (a) (b) (c) | (5) Speed range (R.P.M) 500-3100 | (6) Speed (R.P.M) +/-3500 | (7) Speeds (a) (b) (c) 280 210 180 | (8) | (9) | Revised |------------|----------|---------------|-------------------|---------------------------|---------------------------|----------------------------------|----------------------------------|---------------------------|------------------------------------|-----|---------| | 22.5.24. | Watford | E06c 71096 | 12.875 | 8.5 | 27º | Irreg H.T. Sparking O.K. O.K. O.K. | ---- | 2900 | 220 200 200 | 3º | | | 24.5.24. | " | E06 c 71021 | 12.875 | 8.7 | 27º | " O.K. O.K. | ---- | 2800 | 300 255 240 | 3º | | | 26.5.24. | " | E06d. 67397 | 12.85 | 8.5 | 62º | O.K. O.K. O.K. | ---- | 3600 | 280 270 250 | 2º | | | 20.8.24. | B.T.H. | CE6 406821 | 14.375 | 8.6 | 22º | O.K. O.K. O.K | 3 microhen. leak 700-3500. | 3500 | 250 190 160 | 3º | | | 4.11.25. | " | FM6 356071 | 11.5 | 7.8 | 50º | O.K. O.K. O.K. | 320-3300 | 4500 | 215 170 170 | 2º | quiet | | 10.11.25. | " | FM6 356147 | 11.5 | 7.8 | 50º | O.K. O.K. O.K. | 350 - 3700 | 4500 | 200 170 160 | 2º | " | | 23.11.25. | Watford. | E06d. 73970 | 13.4 | 8.5 | 63º | O.K. O.K. O.K. | 500-3000 | 3450 | 210 160 160 | 2º | Noisy | | 10.11.25. | | | | | | | | | | | | | ||