Question: A wing of symmetrical cross-section has an elliptical planform and is twisted so that, when the attack at the center of the span is 2? , the circulation Γ at a distance y from the wing root is given by
Find a general expression for the downwash velocity along the span, and determine the corresponding incidence at the wingtips. The aspect ratio is 7, and the lift-curve slope for the airfoil section in two-dimensional flow is 5.8.