Reliability of Lodge porcelain and K.L.G. mica ignition plugs for Goshawk engines.
| Identifier | WestWitteringFiles\I\July1922\ Scan0 | |
| Date | 3rd July 1922 | |
| R.R. 235a (100 T) (S.H. 798. 10-12-20) G. {Mr Griffiths - Chief Accountant / Mr Gnapp} 2947 To Hs. {Lord Ernest Hives - Chair} from R. {Sir Henry Royce} ORIGINAL R1/M1. 7. 22. IGNITION PLUGS - X1918 V4425 RE./GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine))S. With reference to ignition plugs, recent experience has shewn that the Lodge porcelain plug sent with the Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)), is not reliable. This is one in which the central electrode is screwed in and surrounded with porcelain at the point. We cannot believe that it is correct to fit it in this way and evidently the porcelain insulator will not stand up. Regarding mica plugs, the K.L.G's have so far done well, but I hear from Messrs Ricardo's experimental shops that these will not stand on most engines which are hard pressed, therefore we believe that they may not last long, and are very expensive. You could confirm their want of reliability by running this type on an aero engine, in which case we believe that the mica insulation around the central electrode becomes loose and detached, and fails hopelessly. JRR R. {Sir Henry Royce} RECEIVED JUL 3 1922 Hs {Lord Ernest Hives - Chair} | ||
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).