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 correct type of sparking plugs for various Kestrel engines.
| Identifier | ExFiles\Box 58\2\ Scan124 | |
| Date | 19th June 1934 | |
| 81812a EP. {G. Eric Platford - Chief Quality Engineer} From Hs {Lord Ernest Hives - Chair} /Wst. Hs {Lord Ernest Hives - Chair} /Wst.7/MA.19.6.34. SPARKING PLUGS. Replying to your EP {G. Eric Platford - Chief Quality Engineer} /Thn.12/MH. {M. Huckerby} 15.6.34., it has been decided that on Kestrel M.S. engines the Lodge A2/2 is at the moment the best sparking plug, the V7/1 having too low a heat factor and the V9/1 too high. The K.L.G.Co., are producing a plug midway between these two but at the moment the Lodge A2/2 should be fitted. For all other Kestrel supercharged engines other than the latest Kestrel VI., IX & X engines the K.L.G. V7/1 should be used. Hs {Lord Ernest Hives - Chair} /Wst. | ||