Discussion
A wing uses a section whose two-dimensional lift curve slope is \( 2\pi \) per radian. At an aspect ratio of \( 8 \) with \( e = 1 \), the finite-wing lift curve slope is
Answer: A
The correction is \( a = a_0 / (1 + a_0 / (\pi AR)) \). Here \( a_0 / (\pi AR) = 6.283 / 25.13 = 0.25 \), so the denominator is \( 1.25 \) and \( a = 6.283 / 1.25 = 5.03 \) per radian. The finite wing has lost a fifth of its section's lift curve slope purely to downwash.
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