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A fuselage is designed as show in below diagram. If velocity of free stream is 120knts then, find the maximum angle marked by’?’.(a) 10° – 12°(b) 40°(c) 39°(d) 54°This question was addressed to me in an international level competition.This intriguing question comes from Configuration Layout topic in division Configuration Layout Considerations of Aircraft Design

Answer»

The correct choice is (a) 10° – 12°

Easiest explanation: Given, FREE stream velocity V = 120knts. As shown in the figure FUSELAGE has some deviation with free stream. For given speed of FREESTREAM air, a typical fuselage should be ALLOWED up to 12.5° maximum. More than the given limit will affect the drag parameters. Hence, answer would be 10°-12°.



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