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The coefficient of moment about the quarter chord is zero for a symmetric airfoil. This implies____

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The coefficient of moment about the quarter chord is zero for a symmetric airfoil. This implies____

(a) Quarter-chord is the center of pressure

(b) Quarter-chord is the center of mass

(c) Quarter-chord has zero forces acting on it

(d) Total lift is zero at quarter-chord

I got this question by my school principal while I was bunking the class.

Question is taken from The Symmetric Airfoil in division Incompressible Flow over Airfoils of Aerodynamics

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Correct choice is (a) Quarter-chord is the center of pressure

To elaborate: The coefficient of moment about the quarter chord is zero. By definition, the center of pressure is the point about which the total moment is zero. Hence, quarter-chord is the center of pressure for the symmetric airfoil. Other statements cannot be said conclusively with the given information.

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