P7.121 In gliding (unpowered) flight, lift and drag are in equilibrium with the weight.Show, that, with no wind, the craft sinks at an angle tan≈ drag/lift. For a sailplane withm = 200 kg, wing area = 12 m², AR = 12, with an NACA 0009 airfoil, estimate (a) stallspeed, (b) minimum gliding angle; (c) the maximum distance it can glide in still air atz = 1200 m.WeightDragHorizontal

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Answered: P7.121 In gliding (unpowered) flight,…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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The drag of an airfoil (Fig.) increases considerably ifyou turn the sharp edge around 180° to face the stream. Canyou explain this?
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Current Attempt in Progress In the 1930s, the U.S. Navy operated dirigibles. The largest was the U.S.S. Akron with a length of 785 ft and a maximum diameter of 132 ft. Its maximum speed was 84 mph (123.2 ft/sec). Moving at top speed at 10,000 ft standard atmosphere, estimate the power required in horsepower to overcome the friction drag. Disregard effects of fins and other protrusions. Assume the surface of the dirigible is smooth and the friction drag is that over a flat plate. (Hint: "unwrap" the outer surface of the ship.) W = hp

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