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Question: 1. An airplane weighing 73.6 kN has elliptic wings 15.23 m in span. For a speed of 90 ms-1 in straight and level flight at low altitude, find
(a) the induced drag and
(b) the circulation around sections halfway along the wings.
2. A glider has wings of elliptical planform with an aspect ratio of 6. The total drag is given by CD = 0.02 + 0.06C21. Find the change in minimum angle of glide if the aspect ratio is increased to 10.
3. Discuss the statement that the minimum induced drag of a wing is associated with elliptic loading, and plot a curve of induced drag coefficient against lift coefficient for a wing of aspect ratio 7.63.
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