Thread: Discussion Airfoil Optimization with XFOIL
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Old Dec 20, 2012, 11:21 AM
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United States, GA, Atlanta
Joined Apr 2005
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Thomas,

The aerodynamic center is defined as the reference point which, when the pitching moment is calculated about this point, it does not vary with angle of attack. For most airfoils this is very close to the quarter-chord point, at least for small angles of attack. You can check this by running XFoil over a range of angles of attack and confirm that the moment coefficient remains roughly constant.

Dan
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