Question

Aerodynamic center and center of pressure coincide for all the airfoils.

(a) False

(b) True

I have been asked this question in class test.

I'm obligated to ask this question of The Symmetric Airfoil in division Incompressible Flow over Airfoils of Aerodynamics

Answer 1

Correct choice is (a) False

To elaborate: Aerodynamic center is the point where the pitching moment remains constant with changing angle of attack. It is generally the quarter-chord for an airfoil. Center of pressure is the point where the resultant of forces act and the moment at that point will change with the change of angle of attack. Thus, the center of pressure will change and may not be the quarter-chord always.