Given an angle of attack 5°, A1=1.5, A2=2 and the chord length is 5m, the moment coefficient about the quarter-chord is_____(a) \(\frac {\pi }{8}\)(b) \(\frac {\pi }{4}\)(c) \(\frac {-\pi }{8}\)(d) –\(\frac {\pi }{4}\)The question was asked during an internship interview.This interesting question is from The Cambered Airfoil topic in section Incompressible Flow over Airfoils of Aerodynamics

Given an angle of attack 5°, A1=1.5, A2=2 and the chord length is 5m,

1.	Given an angle of attack 5°, A1=1.5, A2=2 and the chord length is 5m, the moment coefficient about the quarter-chord is_____(a) \(\frac {\pi }{8}\)(b) \(\frac {\pi }{4}\)(c) \(\frac {-\pi }{8}\)(d) –\(\frac {\pi }{4}\)The question was asked during an internship interview.This interesting question is from The Cambered Airfoil topic in section Incompressible Flow over Airfoils of Aerodynamics
Answer» Correct option is (a) \(\frac {\pi }{8}\) Explanation: The coefficient of moment about the quarter-chord is GIVEN by cm,l/4=\(\frac {\pi }{4}\)(A2-A1) which is cm,c/4=cm,LE+\(\frac {c_l}{4}\). In this question, it COMES out as \(\frac {\pi }{8}\).

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