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Which factor is not a constant factor in cruise method 3?(a) Mach number(b) Angle of attack(c) Altitude(d) Relative air speedThe question was asked in a national level competition.This intriguing question originated from Cruise Method 3 in portion Cruising Performance of Aircraft Performance

Answer»

The correct answer is (d) Relative air speed

To elaborate: The FACTOR that MUST be reduced in cruise method 3 (also known as CONSTANT angle of ATTACK and constant altitude method) is angle of attack. Also the ratio of weight to lift coefficient and relative AIRSPEED are kept constant i.e. W/CL ratio and u are constant throughout the method.



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