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).
Posing questions and suggestions regarding the performance of the E AC Relay Ignition Governor.
| Identifier | ExFiles\Box 65\1\ scan0029 | |
| Date | 22th December 1924 | |
| To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} from EFC. X8685 EFC1/T22.12.24. X.8685. E AC. RELAY IGNITION GOVERNOR. (1) Is the shape of the automatic advance curve on an engine speed base independent of the position of the hand advance ? (2) Is the shape precisely the same both for the magneto and battery ignition ? Or conversely:- (3) Is the shape of the magneto advance curve on a proportional base of ignition lever travel in degrees independent of the speed, i.e. of the degree of automatic advance ? (4) Is the shape of the battery ignition advance curve on a proportional base of ignition lever travel in degrees also independent of the speed, i.e. of the degree of automatic advance ? We should like to suggest that the whole performance of the combined magneto and battery ignition advance might be given on a diagram in which the horizontal base is a proportional degree base of ignition lever travel, and the vertical scale reckoned in the usual way as degrees of engine advance before top centre. Two families of curves would then be drawn, one for the magneto ignition and one for the battery ignition, each family containing a series of curves corresponding to different speeds, i.e. to different automatic advances, and results would appear something like the diagram attached. This would show clearly how nearly the battery ignition corresponds to the magneto ignition for the Contd. | ||