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).
Design and automatic advance requirements for the Goshawk engine's ignition governor.
| Identifier | ExFiles\Box 51\5\ Scan217 | |
| Date | 27th March 1922 | |
| X4354 To E. {Mr Elliott - Chief Engineer} from EFC. {E. Fowler Clarke - Electrical Engineer} c. to Da. {Bernard Day - Chassis Design} c. to EP. {G. Eric Platford - Chief Quality Engineer} c. to Hs. {Lord Ernest Hives - Chair} c. to By. {R.W. Bailey - Chief Engineer} X4354 RE AUTOMATIC ADVANCE OF GOSHAWK IGNITION. The governor was originally designed to allow an angular motion of the governor weights of 30°, corresponding to an angular advance of the cam of 24°, which, however, turned out to be more nearly 23° in the actual governor, (this corresponding to 46° advance on the crankshaft). We believe this amount was based on some figures given by Hs. {Lord Ernest Hives - Chair} of the total of the amount of advance required for the best running of the engine. We think that of this amount it was desired that only about half the total amount should occur between speeds of 250 and 1500 R.P.M. (Throughout this note we shall speak of distributor speeds. Engine speeds are, of course, in all cases just double these). At any rate it has been made clear to us since, that for the best running of the engine, only 12° advance is required between these speeds. Presumably therefore, 11° of advance possible was originally intended between speeds of 0 and 250 R.P.M. EP. {G. Eric Platford - Chief Quality Engineer} has now told us that Sales are anxious that the whole of the advance shall be done automatically and has given us the amounts of advance required for all speeds from 0 to 1500 R.P.M. Previous to this, however, we had been working on the assumption that the automatic advance was required to contd:- | ||