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).
The bench tests conducted on a Scintilla Magneto Type AG-6-A.
| Identifier | ExFiles\Box 48\2\ Scan099 | |
| Date | 15th May 1924 | |
| V4187 To R. {Sir Henry Royce} & E. {Mr Elliott - Chief Engineer} from EFC. {E. Fowler Clarke - Electrical Engineer} c. O.J. & F.N. c. EY. EP. {G. Eric Platford - Chief Quality Engineer} DA. {Bernard Day - Chassis Design} EFC {E. Fowler Clarke - Electrical Engineer} 4/T15.5.24. X.4187 - SCINTILLA MAGNETO TYPE AG-6-A. {Mr Adams} (Sequel to report EFC {E. Fowler Clarke - Electrical Engineer} 1/T9.5.24). Certain bench tests of this magneto have been made since its removal from chassis 7-GII. The lowest speeds at which regular sparking occurred on 5.5 mm. gaps in air in the advanced, central, and retarded positions, (hand range) were 260 r.p.m., 250 r.p.m. and 280 r.p.m. respectively. This is somewhat better than the first (smaller) AM-6-A Sintilla machine, but not as good as the second AM-6-A, which is now on 93-NK. This would suggest that the low speed sparking characteristics suffer in use. The magneto was also tested at high speeds for regular sparking on 5.5 mm. gaps in air and was found to be quite O.K. It should be stated that though the design of the larger and smaller machines is identical on general lines, nevertheless the smaller machine is somewhat more compact and of neater appearance, and would not give the impression of clumsiness observed on the AG-6-A machine. It is now being arranged to put this magneto on an EAC.III. test engine. EFC. {E. Fowler Clarke - Electrical Engineer} | ||