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).
Letter to the Air Ministry detailing the results of tests on A.C. spark plugs with new Sinterkorund insulators.
| Identifier | ExFiles\Box 163\5\ img025 | |
| Date | 29th May 1936 | |
| A.C Plugs √6011. Hs{Lord Ernest Hives - Chair}/Wst. 2/JH. 29th May, 1936. The Secretary, Air Ministry, Savoy Hill House, The Strand, London. W.C.1. For the attention of Mr. Entage R.D.E.3. Dear Sirs, You will be interested to know that we have recently completed several tests on a single cylinder engine, using A.C. plugs fitted with the new Sinterkorund insulators. The plugs tested were Nos. X405, X406, S403 and S404. The results of these tests were really remarkably good, as these people have never supplied us with any sparking plugs for Aero engine work before. The first plug they submitted to us stood up to extreme overload engine conditions on a Kestrel single cylinder engine without any failure or pre ignition. The following is the result of the tests carried out :- (1) Plugs type S403 and S404. These were run under take off conditions on the Kestrel single cylinder at 2400 R.P.M. 210 B.M.E.P. glycol outlet temperature 130°C. and boost air temperature 70°C. both plugs run | ||