HazelNuts,
As pointed out already in the first response to OP, lift is represented by a force acting in the aerodynamic center AND a moment. The lift force then increases with AoA while the moment is approx. constant.
That is exactly what I was trying to point out.
Hoped that was clear from my post !?
CliveL
You can't talk of airfoil pitching moment without also specifying the point about which the moments are being measured.
The point at which the pitching moment is measured would be the aerodynamic center
Re: Cm0 and Center of Pressure: Yes indeed for Zero Lift it is true, there is basically no Center of Pressure. Was an incorrect over-simplification, as happens often when trying to simplify things- Should not try to simplify too much.
regards,
henra