Discussion
A wing is designed with a 10 per cent section to raise the critical Mach number, and tank volume then proves insufficient. The best response is
Answer: D
Correct answer: Reopen the thickness trade against volume
The thickness ratio was chosen on one criterion alone, and a second requirement has now shown that choice to be infeasible. The proper response is to reopen the trade with both criteria present - perhaps a slightly thicker section with a little more sweep to recover the critical Mach number, or a modest chord increase. Adding a centre tank or cutting the range treats the symptom while leaving an unbalanced trade in place, and more sweep alone does nothing for volume.
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