stoned-X,

An airfoil generates lift by producing lower pressure on the top surface than on the bottom surface. Every airfoil shape produces a different pressure distribution, and some are 'better' than others. If that weren't true, then airplane wings would be flat plates. What you are observing is that an ellipse produces a bigger pressure difference between its upper and lower surfaces than a flat plate does, even at the same angle of attack. Is there a reason that you find this surprising?

banktoturn