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 requesting information on maximum fuel octane values and T.E.L. additives for R.A.F. supply.
| Identifier | ExFiles\Box 27a\4\ Scan121 | |
| Date | 19th May 1933 | |
| COPY. 227950/33/R.D.E. 19th May, 1933. Gentlemen, Reverting to your letter of above reference of the ....... April (which has been carefully considered, with all its helpful suggestions) I have now to seek your early reply to the following queries:- Assuming in each case that the anti-detonation value is determined by the C.F.R. method at 900 r.p.m., 212ºF.{Mr Friese} jacket temperature, and 260ºF.{Mr Friese} mixture temperature, (1) what maximum octane value would you normally expect to deliver under the normal contract supply conditions to the R.A.F., without recourse to T.E.L.? (Presumably a fuel superior to the present D.T.D.134 standard but a little inferior to the 80 octane standard envisaged in the original draft specification issued in my letter of March 29th). (2) what addition of T.E.L. would be needed under the same conditions of supply to the R.A.F., having an octane value of (a) 84, (b) 87 ? (This fuel, if adopted, will be employed initially chiefly for engine bench test and air endurance development, bulk supply for the time being following the lines of (1) above. The following assumptions may be made:- (1) The end point in distillation range shall not exceed 190º C. (2) The sulphur content shall not exceed 0.15%, the amount of free sulphur present being insufficient to give discolouration, tested by the I.P.T. method G.B.4. (3) The specific gravity at 15ºC. shall be not more than 0.79. I am, Gentlemen, Your obedient Servant, (Sgd) G.P. Bulman. Assistant Director/R.D.E. | ||