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The best gradient of climb is attained at _____________

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The best gradient of climb is attained at _____________

(a) airspeed below maximum drag speed

(b) airspeed below maximum power speed

(c) airspeed below minimum power speed

(d) airspeed below minimum drag speed

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Asked question is from Climb and Descent Performance with Mixed Power Plants topic in chapter Climb and Descent Performance of Aircraft Performance

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Right choice is (d) airspeed below minimum drag speed

To elaborate: The best gradient of climb is attained at airspeed below minimum drag speed. The best rate of climb is attained at airspeed above minimum drag speed. The actual airspeeds will be a function of excess propulsive thrust.

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