Discussion
A manufacturer is choosing between a 12 per cent and a 10 per cent thick wing section for a transonic transport whose tank volume is already marginal.
Which consideration most strongly favours the thicker section?
Answer: D
Correct answer: Fuel volume and structural depth
A thicker wing encloses more volume for fuel and gives the spar a greater depth, so it carries the bending moment with less material and weighs less for the same strength. Those are the reasons to accept the thicker section when tank volume is already marginal. The three rejected options all favour the thinner section, which has the higher critical Mach number and lower profile drag - a thicker wing is aerodynamically worse, not better.
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