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Location of aerodynamic centre for low speed airfoil is ____

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Location of aerodynamic centre for low speed airfoil is ____

(a) at quarter chord point

(b) at quarter chord from leading edge

(c) there is no such place

(d) at half of chord

This question was posed to me in semester exam.

My doubt stems from Airfoil Selection-3 in chapter Airfoil and Geometry Selection of Aircraft Design

1 Answer

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Right option is (a) at quarter chord point

For explanation: Aerodynamic center is that point at which pitching moment curve slope becomes zero. Hence, it is the point at where pitching moment is almost independent of AOA. For, low speed airfoils it is located at 25% of chord from leading edge.

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