9.27 A rectangular airfoil of 40 ft span and 6 ft chord has lift and drag coefficients of 0.5 and 0.04, respectively, at an angle of attack of 6 . Determine the lift, drag, and horsepower needed to fly this airfoil at 50, 100, and 150 mph horizontally at this angle of attack through still air at 40 F and 13.5 psia.