The pitching moment of a positively cambered NACA airfoil about its leading edge at zerolift angle of attack is
(A) negative.
(B) positive.
(C) indeterminate.
(D) zero.
The pitching moment of a positively cambered NACA airfoil about its leading edge at zerolift angle of attack is
(A) negative.
(B) positive.
(C) indeterminate.
(D) zero.