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Which of the following is correct? (a)D = q*S*CD

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in Aircraft Design by (701k points)
Which of the following is correct?

(a) D = q*S*CD

(b) D = q*S*CD*ρ

(c) D = q*CD

(d) D = q

I have been asked this question in my homework.

The origin of the question is Aerodynamic Coefficients in division Aerodynamics of Aircraft Design

1 Answer

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Right choice is (a) D = q*S*CD

To explain: Above equation is a general equation of drag force. Drag on an aircraft or any other object depends on number of factors such as local dynamic pressure q, area S etc. A typical value of drag can be given as, Drag D = q*S*CD where, CD = drag coefficient.

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