The Oshkosh airfoil is a modification of the Joukowski airfoil transformation, developed by R. T. Jones in the 80's. The Joukowski airfoil is based on a conformal transformation of a circle with circulatory flow combined with a uniform flow field into an airfoil shape. This results in an exact solution to ideal fluid flow around an airfoil type shape. The Oshkosh airfoil first transforms the circle into an oval, and then transforms the oval into an airfoil. Selection of the transformation parameters can give an airfoil that is similar to a NACA 6 series.