The pitching moment of a positively cambered NACA airfoil about its leading edge at zero- lift angle of attack is

The pitching moment of a positively cambered NACA airfoil about its leading edge at zero- lift angle of attack is

Q. The pitching moment of a positively cambered NACA airfoil about its leading edge at zero- lift angle of attack is

(A) negative.

(B) positive.

(C) indeterminate.

(D) zero.

Ans: negative

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