Discussion
Statement I: A T-tail is heavier than a conventional tail of the same area.
Statement II: The fin must carry the tailplane's loads down to the fuselage, so it is structurally deeper and stiffer.
In the light of the above statements, choose the correct answer.
Answer: A
Correct answer: Both Statement I and Statement II are correct
Both are true and the second is the reason for the first. On a T-tail the tailplane's lift, and the loads from elevator deflection and gusts, must be carried down the whole height of the fin as bending and torsion.
The fin therefore needs deeper spars and heavier skins than one carrying only its own side load, and it must be stiff enough to keep the tailplane's flutter speed acceptable. The penalty is usually put at 20 to 30 per cent of fin weight, which is why the configuration is adopted when the engine position demands it rather than for its own sake.
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