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 considerations for a magneto, including spark control, dimensions, materials, and coupling mechanism.
| Identifier | ExFiles\Box 54\5\ Scan242 | |
| Date | 26th April 1923 | |
| Contd. -2- RL/M26.4.23. for this, i.e. a magneto with ample range of advance and capable of sparking efficiently in late position of control so that when engine is turned slowly by starting handle there is no risk of starting failure. It will be remembered that the magneto should be as small in dimensions (height etc.) as possible, so as to permit of tappet adjustment. This I understand can be achieved by the use of the new cobalt steel magnet, and also we shall have the great advantage of the absence of the distributor. These points with the magneto swung over will render the tappets passably accessible, but suitable spanners may be required. The coupling on the front end of the magneto driving shaft will need to slide along its shaft probably located by spring plunger in coupled and uncoupled positions. Also it will perhaps be possible to arrange a spinning or other fitting on the rear of the dynamo to support this shaft in the uncoupled position. R. {Sir Henry Royce} | ||