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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’?’.

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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

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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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