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).
Specifications for fuel composition and usage during initial and development engine type tests.
| Identifier | ExFiles\Box 27a\4\ Scan205 | |
| Date | 4th September 1933 guessed | |
| (3) (10) For the initial type tests of new designs of engine or new "marks" of existing types, on a D.T.D. 230 basis, the fuel employed shall contain within reasonable inspectional limits the maximum addition of T.E.L. permitted (4 ml. per gallon). The orders for such fuel must clearly state the purpose for which it is intended, i.e. Air Ministry aero engine type test, so that the fuel supplier can make up and deliver, as may be necessary, a blend of fuel lying wholly within the terms of the specification with an octane value restricted to a maximum of 87 plus 1 and, withal, the maximum T.E.L. admitted by the specification. (The Department is satisfied that while such fuels made up for type test purposes by the various fuel suppliers will probably differ from the precise blends they will deliver on contract for Royal Air Force use, the combination of maximum lead content and restricted octane value need not entail recourse to constituents in the type test fuel which may be deleterious to the engine in the sense that the engine, on type trial, may be subjected to artificial conditions of combustion and may be misleading in drastic effect as compared with the conditions offered by D.T.D.230 fuel as actually supplied for general Royal Air Force use). (11) The T.E.L. content and octane value of the fuel provided for the initial engine type test will be determined and submitted for the Department's approval before the type test is begun. (12) When it has been established satisfactorily on the initial type test that the engine suffers no detriment from the effect of the full T.E.L. content permitted by the specification, subsequent type tests may be run with standard fuels, as currently supplied to the Royal Air Force by the various firms, subject to the restriction of paragraph 8. (13) Similarly, the development testing of engines, as distinct from type trial and re-rating tests, may proceed on any D.T.D. 230 fuel, identical in quality with the suppliers' current deliveries on Air Ministry contract, notwithstanding that such fuel may have an octane value greater than that specifically demanded by the specification. Cont'd.{John DeLooze - Company Secretary} | ||