Discussion
Aspect ratio is chosen as a compromise between
Answer: B
Correct answer: Induced drag against structural weight
Induced drag falls with aspect ratio,
\[ C_{Di} = \frac{C_L^2}{\pi A e} \]so a slender wing is aerodynamically better. But a slender wing has a longer bending moment arm and a smaller structural depth for its span, so it is heavier for the same strength, and it may also exceed the airport gate box. Aspect ratio is therefore settled where the drag saving and the weight penalty balance, typically between 8 and 11 on a transport.
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