For 10 points, identify these objects, examples of which include sails, wings, and propellers, a term properly referring to the shape of such an object in cross-section.
One approach to designing these objects is to transform their shape conformally into a circle and solve an integral equation, a technique known as Theodorsen's method. Another way of designing these objects is to apply the Zhukovsky transformation, which results in these objects that have a cusp at the trailing edge. In the theory of the "thin" types of these objects, these objects are modeled as vortex sheets that coincide with the camber line, which is constrained to be a streamline, and the strength at the trailing edge is set to zero to represent the Kutta condition. In order to fulfill its primary function, this object's shape must give rise to a circulation to satisfy the requirements of the Kutta-Zhukovskytheorem. The performance of these objects is typically characterized by plots of the drag and lift coefficients as a function of the angle of attack. For 10 points, identify these objects, examples of which include sails, wings, and propellers, a term properly referring to the shape of such an object in cross-section.
One approach to designing these objects is to transform their shape conformally into a circle and solve an integral equation, a technique known as Theodorsen's method.
airfoil [prompt on "wing" or similar answers before mention]