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).
Unsuitability of single-point Champion spark plugs and requesting multi-point plug samples.
| Identifier | WestWitteringFiles\D\March1920\ Scan59 | |
| Date | 6th August 1919 | |
| [Handwritten] Hs{Lord Ernest Hives - Chair} American Champion SPARK PLUGS to B6-NBG ? R Champion - ? Eagle S/see for car requirements DR [Typed - Mirrored Text] we do not consider these plugs suitable for our requirements. CHAMPION PLUGS. we have so far only received one sample of these plugs. This is not sufficient to form an opinion. It is a fact that a single point plug has been adopted, but for running on our two engines the best results have been obtained with the multi-point plug, and we should like to have samples of the plugs which have been proved successful on H-S aero service by our two representatives. Our two most troublesome points have been solved - - for our work we prefer a plug which has - 1. Good insulation. 2. Thick sparking points. 3. Fine sparking points. [Handwritten] HB{C. E. Harcombe} [Footer Text] R.R. 235A (100 T) (S.F. 846. 6-8-19) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2460. | ||