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The aerodynamic center for all the airfoils lies exactly at the quarter-chord always for all the given angle of attacks.

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The aerodynamic center for all the airfoils lies exactly at the quarter-chord always for all the given angle of attacks.

(a) True

(b) False

The question was posed to me by my college professor while I was bunking the class.

Question is from The Cambered Airfoil topic in section Incompressible Flow over Airfoils of Aerodynamics

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Correct choice is (b) False

Easiest explanation: The aerodynamic center is always near the quarter-chord for airfoils with linear lift and moments but it is not exactly the quarter-chord always.

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