Smooth spline curvature comb

Hello, I was wondering if there is an easy way to maintain agradually changing curvature comb of a spline. For example, howwould one generate a smooth airfoil shaped curve for the flap andaileron of an aircraft wing. Playing with the spline control pointsseems like a lot of trial and error to get the curve just right.

Any suggestions?

Thanks,
Peter FerreiraSolidworksGeneral