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 reconsideration points for the Goshawk II magneto ignition system.
| Identifier | WestWitteringFiles\J\December1922\ Scan29 | |
| Date | 16th December 1922 | |
| R.R. 235A (100 T) (S.H. 159. 11-8-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2800 TO HS.{Lord Ernest Hives - Chair} FROM E.{Mr Elliott - Chief Engineer} c.c. to CJ. BY.{R.W. Bailey - Chief Engineer} FP.{F. Potts} [STAMP: ORIGINAL] [STAMP: RECEIVED DEC 14 1922] GOSHAWK II. MAGNETO IGNITION. x 3537 Referring to the above this required reconsideration in respect to three points:- (1) Is there any advantage in rocking the magneto over 30°? We have set this out and we find that owing to the proximity of the induction pipe it is not possible to reasonably operate the spanners for adjusting the tappets without removing the magneto. The worst position is at the front end of the magneto where the induction pipe is nearest due to it's downward slope. Perhaps you would rig up a magneto on a car in the 30° position and make a practical trial. The wiring becomes very awkward with the magneto in this inclined position. We think there is no advantage in departing from the present position. (2) Can the magneto be taken off and put back without losing the timing? Mr. Royce agrees to making a blank tooth in the coupling on the magneto, and also agrees that the degree of adjustment obtainable with the use of the remaining coupling at the dynamo end of the shaft is sufficiently fine. (3) Can the control gear for advancing and retarding the magneto be easily dismounted? Mr. Royce has agreed to the use of an easily detachable ball joint on the magneto arm. This should be of the type of which a model was sent to Derby with instructions to have a set made and tried some time ago. The ball joint should be on the bottom end of the link connected to the magneto arm, and so far as we can see in this position it can be easily levered off with a screwdriver. E.{Mr Elliott - Chief Engineer} | ||