The ratio of lift to drag L/D for a wing or airfoil is an important aerodynamic parameter; indeed it is a direct measure of the aerodynamic efficiency of the wing. If a wing is pitched through a range of angle of attack, L/ D first increases, then goes through a maximum, and then decreases. Consider an infinite wing with an NACA 2412 airfoil. Estimate the maximum value of L/D. Assume the Reynolds number is 9 × 106.
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