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).
Table of magneto performance data to new general specifications, incorporating automatic advance.
| Identifier | ExFiles\Box 48\2\ Scan162 | |
| Date | 21th August 1924 | |
| E.F.C. V4187 * X. 430. TABLE OF MAGNETO PERFORMANCE TO NEW GENERAL SPECIFICATION. (INCORPORATING AUTOMATIC ADVANCE). | Date of test. | Make. | MAGNETO. Type. | No. | (1) Weight (lbs). ->15 | (2) Safety gap (mms) (<-12000 V) | +(3) Available range. Total (60°) | Auto (30°) | Hand (30° to 25°) | (4) Remarks. | (5) Speed range (RPM.) | (6) | (7) Speeds (b)(210) (c)(190) | (8) | (9) Remarks | |---|---|---|---|---|---|---|---|---|---|---|---|---|---|---| | 13.7.23 | Scintilla | AM6A | 26485. | 12.5 | 11.5 | 53 | 33 | 20 | H.T. brushes soft. Safety gap too large. | - | O.K. | 220 | 410 | - | Reasonably quiet. | | 21.3.24. | " | " | 34937. | 12.5 | 11.8 | 53 | 32 1/4 | 20 1/4 | " | - | O.K. | 150 | 280 | - | " | | 16.7.24. | " | " | 28531. | 12.5 | 11.1 | 51 | 32 | 19 | H.T. brushes soft. Safety gap too large. | - | O.K. | 140 | 230 | - | V. {VIENNA} quiet. | | 16.7.24. | " | " | 28533 | 12.5 | 11.2 | 53 | 33 | 20 | " | - | O.K. | 245 | 385 | - | " | | 21.8.24 | Scintilla | AG6A | 34903 | 14.5 | 11.2 | 57 | 38 | 19 | " | 960 -1250 3-5gok 3 jumbles | O.K. | 160 | 290 | Not comply. | Reasonably quiet. | + See separate curves for advance characteristics. + See separate curves for advance characteristics. | ||