specific fuel consumption
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specific fuel consumption[spə′sif·ik ′fyül kən‚səm·shən]
Specific fuel consumption
The ratio of the fuel mass flow of an aircraft engine to its output power, in specified units. Specific fuel consumption (abbreviated sfc or SFC) is a widely used measure of atmospheric engine performance. For reciprocating engines it is usually given in U.S. Customary units of pound-mass per hour per horsepower [(lbm/h)/hp or lbm/(hp·h)], and International System (SI) units of kilograms per hour per kilowatt [(kg/h)/kW]. See Reciprocating aircraft engine
For the gas turbine family of atmospheric aircraft engines, and for ramjets, performance is usually given in terms of thrust specific fuel consumption (abbreviated tsfc or TSFC) expressed as fuel mass flow per unit thrust output with Customary units of pound-mass per hour per pound-force [(lbm/h)/lbf] or SI units of kilograms per hour per newton [(kg/h)/N; 1 N equals approximately 0.225 lbf]. For high-supersonic and hypersonic ramjets, specific fuel consumption is sometimes given in pound-mass per second per pound-force [(lbm/s)/lbf] or kilograms per second per newton [(kg/s)/N]. See Aircraft propulsion, Jet propulsion, Propulsion, Ramjet, Turbine propulsion, Turbojet