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).
Specification document for standard fuel for aircraft engines, detailing its properties and testing requirements.
| Identifier | ExFiles\Box 27a\4\ Scan028 | |
| Date | 2nd December 1932 guessed | |
| COPY. X.1282 D.T.D. SPECIFICATION NO.134 FOR STANDARD FUEL. FOR AIRCRAFT ENGINES. 1. DESCRIPTION. The standard fuel for aircraft engines shall consist of high grade petrol refined entirely from crude petroleum and shall not contain more than traces of clefine hydrocarbons (cracked spirit). In order to obtain the necessary anti-detonation value as specified in clause 7 it is permissible to add "aromatics" only, the extent of such addition being governed by the other clauses of this specification. The fuel as a whole shall be clear, water white, free from undissolved water, mineral acid, and any other impurities. 2. SPECIFIC GRAVITY. The specific gravity at 15°C shall be not more than 0.79. 3. DISTILLATION. When 100 c.c. of the fuel are distilled in the standard distillation apparatus (D.S. Specification NO.2D.15) at a rate of two drops per second, there shall distill at 760 m.m. pressure :- Below 50°C not more than 5 c.c. " 75°C " less " 5 c.c. " 100°C " " " 50 c.c. " 150°C " " " 80 c.c. End point not greater than 190°C. At least 96 c.c. shall be recovered as distillate in the receiver from the distillation. 4. RESIDUE ON EVAPORATION. When 50 c.c. are heated in a hemispherical glass dish 3 1/2" in diameter, on a bath of boiling water for one hour, the residue shall not exceed 0.01% by weight, and the residue shall be of an oily nature. 5. SULPHUR CONTENT. There shall be a complete absence of free sulphur, and the total sulphur content shall not exceed 0.15% by weight. 6. FREEZING POINT. The freezing point shall be below - 50° C. 7. ANTI-DETONATION VALUE. The fuel supplied to this specification shall be at least equal in quantity, as regards its resistance to detonation, to a standard reference fuel as per Appendix I. Any method of matching this standard reference fuel as regards anti-detonation value may be used by the Contractor, but the Air Ministry, for the purpose of inspection of fuel, will utilise a single unit, running at not less than 900 R.P.M., and fitted with a standard Midgley bouncing pin. It should be noted, that when using the standard reference fuel on such a unit, it will be necessary to add heat to the intake to prevent freezing. Cont'd.{John DeLooze - Company Secretary} | ||