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 from the Air Ministry concerning the suitability of two types of radio-screened spark plugs for the Merlin engine.
| Identifier | ExFiles\Box 58\2\ Scan247 | |
| Date | 1st November 1935 | |
| Tel. No. HOLBORN 3434. Any communications on the subject of this letter should be addressed to :- THE SECRETARY, AIR MINISTRY, ADASTRAL HOUSE, KINGSWAY, LONDON, W.C.2. and the following number quoted :- 255207/33/R.D.E.3/C.J. 86000. NATIONAL SCHEME FOR DISABLED MEN AIR MINISTRY, LONDON, W.C. 2. November 1935. Radio Screened Plugs For the attention of Mr. West. Gentlemen, I am directed to refer further to this Department's letters of the 16th October and 1st November under reference 186753/22, and to enquire whether you consider the two types of sparkling plug forwarded on the 1st November suitable for test. It is pointed out that the 14 m.m. plug X.506, being equivalent to A.14/1, may not be considered to have a sufficiently high heat factor for the Merlin engine under test bench conditions, though it might be suitable for flight conditions. A screened plug equivalent to the higher heat factor plug, X.495/1, at present being type tested on the Merlin engine, can be supplied if considered more desirable. I am, Gentlemen, Your obedient Servant, E.L. Mayall Eubage for Assistant Director/R.D.E. for Director of Technical Development. Messrs. Rolls Royce Ltd, DERBY. | ||