The lift-to-drag ratio is an indication of the effectiveness of an airfoil. Referring to Problem 43, the
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The lift-to-drag ratio is an indication of the effectiveness of an airfoil. Referring to Problem 43, the equations for lift and drag are
where, for a particular airfoil, the lift and drag coefficients versus angle of attack , α are given by
Using the first two equations, we see that the lift-to-drag ratio is given simply by the ratio CL /CD.
Plot L/D versus , for -2° ≤ α ≤ 22°. Determine the angle of attack that maximizes L/D.
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