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).
Typed analysis of duplication in magneto systems, discussing various failure modes and advantages.
| Identifier | WestWitteringFiles\N\2October1925-December1925\ Scan119 | |
| Date | 3rd November 1925 | |
| EFC4/T3.11.25. -3- Contd. taking the description as it stands, what the function of this impedance actually is, and it appears that there must be some error in the description. It appears that the duplication is not as good a duplication as two entirely separate magneto systems, but gives the following advantages over a single magneto system, some of which are already given by a single double-spark magneto :- (1) The production of two electrically synchronized sparks. This would be given by a double spark magneto with a single secondary winding. (2) The duplication from the point of view of secondary open circuited breakdown of the secondary windings. This could be provided by a single double-spark magneto with independent secondaries, i.e. inside ends independently connected to primary circuit. Apparently it would not give duplication of the system from the point of view of a shorted secondary circuit failure, because both secondaries being on the same core, the shorted one would damp the action of the whole system. (3) Duplication of the system as regards open circuited primary winding failure. N.B. Apparently it would not give duplication of the system from the point of view of a shorted primary circuit failure, for the same reason as above. (4) Duplication as regards open circuited contact breaker and condenser failure. This is the kind of duplication provided by the twin contact breaker on the Liberty system. Contd. | ||