g Gravitational constant (m/s 2 ) IFR Instrument Flight Rules LCV Lower calorific value (specific energy) (MJ/kg) L/D Lift/Drag ratio R Range (km) SPK synthetic paraffinic kerosene sfc Specific fuel consumption (mg/Ns) V flight speed (ms -1 ) W Weight (N) ρ Density (kg/m 3 ) Subscripts 0 Initial condition at start of flight cycle e empty f fuel i Section of flight cycle p payload ABSTRACTWith changes in the availability and quality of existing aviation fuels anticipated in the next 30 years it is timely to assess how changes in fuel properties would affect the range payload performance of aircraft. The effects on range and payload of a wide range of candidate fuels for aviation are investigated, including changes to the blends of conventional hydrocarbon fuels. Lighter fuels tend to be more desirable for commercial flights, where the flight is as close to the maximum payload as possible. Flights favouring range over payload are better suited by a more dense fuel. The hydrocarbon blends suggest for each aircraft, an optimum fuel may exist for the maximum payload and allowing the maximum range. Specific flight plans below the maximum range of the aircraft may be met with a lower specific energy fuel. NOMENCLATUREFAME fatty acid methyl ester FT Fischer Tropsch
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