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).
The performance and failure of 12 Champion Long Reach N.A.9 sparking plugs from engine 36-EX.
| Identifier | ExFiles\Box 142\3\ scan0084 | |
| Date | 30th December 1936 | |
| 1204. To Rm.{William Robotham - Chief Engineer} C.c. to Wst. Rm{William Robotham - Chief Engineer}/WB.{Mr Brazier/Mr Bell}2/JH.30.12.36. Champion Sparking Plugs. We have removed 12 Champion Long Reach N.A.9. sparking plugs from the engine of 36-EX. These plugs were fitted to the exhaust side of the engine, they have completed 1946 miles. At 1762 miles they were taken out for misfiring, one had broken down electrically, the rest were cleaned, set tested and replaced. After 200 miles they again failed, the pressure test snowing them all firing intermittently. They have been returned to Wst. for inspection. Rm{William Robotham - Chief Engineer}/W.Brazier. W Brazier | ||