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

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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} )
Answer» B. ( frac { pi }{4} )

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