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For a piston engine, specific fuel consumption is defined as the..
  • A
    mass of fuel required to produce unit power for unit time.
  • B
    designed fuel consumption for a given RPM.
  • C
    quantity of fuel required to run the engine for one minute at maximum operating conditions.
  • D
    maximum fuel consumption of the aircraft.
The Specific Fuel Consumption is the mass of fuel required to produce a unit horsepower per unit time. In other words, it is the ratio of fuel used in kg/hour per kN thrust or kW of shaft power. This variable is related to the thermal and propulsive efficiency of any given engine. The ideal engine would produce as much power as possible for a minimum of weight of fuel burnt.

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