  We show a simple, analytic equation describing a class of two-dimensional
shapes well suited for representation of aircraft airfoil profiles. Our goal
was to create a description characterized by a small number of parameters with
easily understandable meaning, providing a tool to alter the shape with
optimization procedures as well as manual tweaks by the designer. The generated
shapes are well suited for numerical analysis with 2D flow solving software
such as XFOIL.
