One approach to designing these objects is to transform their shape conformal y 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 
One approach to designing these objects is to transform their shape conformal y 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 fulfil its primary function, this  object's shape must give rise to a circulation to satisfy the requirements of the Kutta-Zhukovsky  theorem. The performance of these objects is typical y 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 propel ers, 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 conformal y into a circle and solve  an integral equation, a technique known as Theodorsen's method.
airfoil [prompt on “wing” or similar answers before mention]