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).
Continued discussion on improving ignition coil and wiring design to reduce self-induction.
| Identifier | ExFiles\Box 54\5\ Scan222 | |
| Date | 15th November 1922 | |
| R.R. 199 (250T) (SD676 19-7-17) MP18086s F1/M15.11.22. -2- Contd. which also appears should be kept 1" clear with air space ? The primary wiring throughout except on the magnetic coil should have low self-induction. Ought not the ballast resistance itself to be non-inductive ? The pulsating ignition circuit should bot be carried in iron piping, and hence it appears that carrying the wire through Simplex tubing to the battery is wrong. With regard to supports and sheaths for wiring we suggest they ought to be :- (1) Non-magnetic. (2) Of high resistance strip metal spirally wound. (3) Or preferably of insulating material. (4) Also even the steel of the frame in close proximity would increase self-induction. We are redrawing the coil for such improvements as can be suggested; we are trying to make it liquid tight so that it can be filled with wax which at present may leak out if raised to melting point. Let us know at once if this promises to be an advantage, and also what dimensions could be modified with advantage. We do not want to use more current and one cannot see how we can get more energy into the coil unless we use more current, except perhaps wasting a less proportion in the ballast resistance. I would like you to concentrate on this work until we have tried the value of everything that might make an improvement. R. {Sir Henry Royce} | ||