Principles of Flightmedium#511
Induced drag varies with speed such that it:
A
Increases as speed increases
B
Remains constant at all speeds
C
Decreases as speed increases (for constant weight and altitude)
CorrectD
Is zero at high speed
Explanation
At higher speed, less angle of attack is needed for the same lift, producing weaker tip vortices and less induced drag. Di ∝ 1/V².
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