where:
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is the propeller efficiency.
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is the aircraft lift coefficient at the given flight condition.
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is the ratio of the air density at landing altitude and ISA to that at sea-level and ISA.
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is the number of engines on the aircraft.
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is the FAR 25.111 One Engine Inoperative climb gradient at approach requirement.
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is the drag coefficient.
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is the increment in drag coefficient due to a stopped propeller.
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is the aircraft landing weight.
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is the aircraft take-off weight.
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is the wing loading at take-off.
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