AER 615 Lecture Notes - Lecture 2: Mach Number, Thrust Specific Fuel Consumption, Density Of Air

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Cruise performance depends on the requirements for a given flight mission, e. g. , maximum range (minimum fuel, a to b), maximum endurance, minimum trip time, or minimum cost. This performance may be characterized by a number of parameters. Note the definition of the parameter, specific air range [sar], as follows: V m f noting that for jet aircraft, t t. In terms of equivalent airspeed ve and pressure ratio * , given. D and the graph typically containing curves of increasing values for w/* , as may be seen in the example chart of fig. Ma and for ( of air being 1. 4, where ma is the true flight mach number (in level flight), This trend, along with the sar peak (which corresponds to the maximum-range flight. Mach number), will fall off as the aircraft weight and corresponding speed bring it into the drag divergence regime, when the flight mach number ma becomes a bit greater than.

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