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 fuel specifications D.T.D.224 and D.T.D.230 for aero engines.
| Identifier | ExFiles\Box 27a\4\ Scan203 | |
| Date | 4th September 1933 | |
| COPY. 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 227950/33/R.D.E. AIR MINISTRY, LONDON W.C.2. 4th, September 1933. Air Ministry Fuel Specifications for Aero Engines - D.T.D.224 and D.T.D.230. Gentlemen, In the letter of the 5th August 1933, addressed to aero engine constructors, enclosing advance copies of the above fuel specifications, it was indicated that the Department's proposals for the employment of these respective fuels would be outlined in an early communication. They are as follows:- (1) D.T.D.134 fuel, at present standard throughout the Royal Air Force, will be displaced by the 77 octane fuel, D.T.D.224, starting, it is hoped, with all Ministry contract deliveries of fuel as from October 1st, 1933. (2) It is not proposed to re-rate any existing Service type engines on a 77 octane fuel basis; but applications for the approval of higher boost pressure for "take-off" purposes, taking advantage to the modest increase in octane value over the D.T.D.134 standard will be considered on their merits. (3) The 87 octane fuel, D.T.D.230, will be made available in the Royal Air Force for those engines which have been type tested and approved with this fuel as soon as such engines come into Service use. The date of introduction and the extent of the use in the Royal Air Force of the 87 octane fuel will, therefore, depend primarily on the proved ability of engine constructors to take advantage of the higher quality fuel in their new type engines. Cont'd.{John DeLooze - Company Secretary} | ||