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Old 7th Jan 2011, 21:32
  #10 (permalink)  
henra
 
Join Date: May 2010
Location: PLanet Earth
Posts: 801
This is the point at which the lift due to angle of attack acts.
Hmm, I'm afraid that is not universally correct.
That would be the Center of Pressure.
The Aerodynamic Center is the Point at which the moment is constant, independent of AoA, but not necessarily Null.
Yes, generally that is close to the Quarter Chord Line but it depends on the Airfoil (mainly on the Camber) where it is exactly.
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