Thanks for the response Cub. Conceptually I am pretty squared away on the term airfoil and I don’t mean to suggest anything by specifying “airfoil” in my post. I came across the term “aerodynamic center” the other day and I don’t recollect ever seeing the term before. So I thought I would throw it out and take advantage of erudite individuals who post on this forum and maybe learn something new.

From what I have since learned Aerodynamic Center (AC) is an aerodynamic reference point on the chord where all changes in lift take place and the coefficients of moment are constant. It is unlike the center of pressure which is a function of camber and section lift coefficientis and therfore dynamic in nature. The AC’s location is not affected by camber, thickness and AOA. By using the “aerodynamic center” as the location where the aerodynamic force is applied it supposedly eliminates the problem of movement of the center of pressure in aerodynamic analysis. It’s most direct application seems to be longitudinal stability since the explanations I have encountered speak in terms of center of pressure and center of gravity.

I am curious to know if this is just some theory or is there empirical evidence or mathematical proof for the fact that there exists such a point on all airfoils?