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).
Page discussing average advance curves for various Scintilla magnetos and their application to a 20 HP engine.
| Identifier | ExFiles\Box 37\1\ scan 270 | |
| Date | 27th August 1924 | |
| Contd. -5- EFC9/T27.8.24. (4) Average advance curve of AM-6-A Scintilla magnetos (5) Average advance curve of AG-6-A Scintilla magneto No. 21523. (6) Average advance curve of AG-6-A Scintilla magneto. No. 34903. (The above group of curves A, B1, B2 and C, eh are complete as regards automatic advance curves that have at any time been issued, so that previous curves may be destroyed, if desired.) This group of curves of advance is interesting comparatively in judging the relative value of advance characteristics given by various types of governor, but it will be understood that in the application of these to the engine they will not necessarily be in the same relative position vertically, and that is the reason they have been supplied in the earlier group as tracings which can be applied in any position vertically to the engine curves. There is also a tracing (to the reduced scale) of the curves of advance required for the 20 HP. engine, as given by EP.{G. Eric Platford - Chief Quality Engineer} and described earlier, which curve can be applied to (super-posed upon) any of these sub-groups, and in any setting vertically, and the differences appreciated. Referring to the fifth par. of EL/MS.8.24, attached to it's copy will be found a sheet, EFW/T23.10.23, containing a statement in regard to the 20 HP. magneto and battery ignition, and though 10° a.d.p. is there given as the maximum retard setting of the ignition, we understand that Contd. | ||