Discussion
A design team must choose between a 15 per cent larger tailplane and a 1.5 m rear fuselage extension to gain the same tail volume.
Which consideration most favours the fuselage extension?
Answer: B
Correct answer: The extra cabin or hold volume it also provides
Both options buy the same tail volume, so the choice turns on what else each brings. A fuselage extension adds usable length - another seat row, or more hold - which is revenue the tail area cannot generate.
The other claims do not hold. A fuselage plug is generally the more expensive change, since it disturbs systems routing and the structure; a 1.5 m barrel section has more wetted area than 15 per cent of a tailplane; and the extension moves the tail's mass further aft, shifting the centre of gravity more, not less.
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