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).
Air Ministry general specification for standard fuel for aircraft engines.
| Identifier | ExFiles\Box 27a\4\ Scan102 | |
| Date | 28th April 1933 guessed | |
| COPY. AIR MINISTRY GENERAL SPECIFICATION. NUMBER D.T.D........... 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, coal spirit or a mixture thereof. The fuel as a whole shall be neutral, clear, free from undissolved water, and any suspended matter. In order to obtain the necessary anti-detonation value as specified in Clause 8, it is permissible to add aromatic hydrocarbons and/or tetra ethyl lead in the form of 1T ethyl fluid in concentrations not exceeding "X" m.l.s. of tetra ethyl lead per Imperial gallon. The extent of such additions will be governed by the succeeding clauses in this specification. (2). DISTILLATION RANGE. When 100 m.l.s. of the fuel submitted are distilled in the standard distillation apparatus, there shall distill at 760 m.m. pressure:- Below 50°C. not more than 2% " 75°C. not less than 10% " 100°C. " " " 50% " 150°C. " " " 90% The end point shall not exceed 175°C. The distillation loss shall not exceed 2% The total volume of distillate collected in the receiver shall not be less than 96% (3). VAPOUR PRESSURE. The vapour pressure as determined by the Reid method at 37.8°C. (100°F.{Mr Friese}) shall not exceed 7 lbs. per sq. inch. (4). SPECIFIC GRAVITY. The specific gravity at 15°C. shall not be more than 0.78. | ||