Discussion
An airline asks for a derivative with 15 per cent more range from the same airframe, and the design team proposes raising the aspect ratio from 9 to 11.
What is the principal obstacle to this change?
Answer: C
At constant area, raising aspect ratio from 9 to 11 stretches the span by about ten per cent, which can push an aircraft out of its airport category. Induced drag would fall, which is the point; it is the gate box and the structural weight that resist.
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