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Equivalent skin friction coefficient may include ______________

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in Aircraft Design by (701k points)
Equivalent skin friction coefficient may include ______________

(a) skin friction and separation drag

(b) only wave drag

(c) only skin friction drag

(d) only thrust loading

I got this question in homework.

My query is from Aerodynamics topic in division Aerodynamics of Aircraft Design

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Correct answer is (a) skin friction and separation drag

The explanation is: Equivalent skin friction coefficient includes both skin friction and separation drag. Wave drag is supersonic phenomenon. Wave drag occurs when aircraft is traveling with speeds greater than the speed of sound. Thrust loading is defined as the ratio of the thrust and weight.

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