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At which speed the maximum rate of climb occurs?

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in Aircraft Performance by (558k points)
At which speed the maximum rate of climb occurs?

(a) u=0.76

(b) u=0.98

(c) u=1

(d) u=2

This question was addressed to me in final exam.

My question is based upon Climb and Descent Performance with Mixed Power Plants topic in portion Climb and Descent Performance of Aircraft Performance

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The correct answer is (a) u=0.76

The best I can explain: The maximum rate of climb occurs at the airspeed u=0.76 m/sec. 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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