Question

An aircraft with elliptic wing planform has parasite drag coefficient as 0.6. Lift coefficient of wing is 0.25 and aspect ratio is 7.5. If induced drag co-efficient is 0.0235 then, find total drag coefficient for the wing.

(a) 0.06235

(b) 0.5235

(c) 0.6

(d) 0.0235

The question was posed to me by my school teacher while I was bunking the class.

My question is taken from Wing Geometry-2 topic in section Airfoil and Geometry Selection of Aircraft Design

Answer 1

The correct answer is (a) 0.06235

The explanation is: Given, parasite drag co-efficient = 0.6, induced drag coefficient = 0.0235

Total drag coefficient = Parasitic drag coefficient + induced drag coefficient = 0.6+0.0235 = 0.06235.