Discussion
Which of these is NOT a recognised drawback of the T-tail?
Answer: A
Correct answer: Reduced tailplane effectiveness in normal flight
In normal flight a T-tail is more effective, not less, since it sits above the wing's downwash and wake and clear of engine efflux, working in cleaner air with a higher local dynamic pressure.
The genuine drawbacks are the other three: a heavier fin, which must carry the tailplane's loads over its full height; the deep stall risk at extreme angle of attack, where the wake can finally blanket the surface; and the complexity and cost of the fin-to-tailplane joint, which must transfer those loads and stay flutter-free.
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