Discussion
Consider the following pairs of tail configuration and its principal drawback:
T-tail - Deep stall risk and a heavier fin
V-tail - Coupled pitch and yaw control
Canard - Destabilising foreplane demanding a forward centre of gravity
Conventional tail - Poor rudder authority in a crosswind
How many of the pairs given above are correctly matched?
Answer: A
Correct answer: Only three
Three of the pairs hold. A T-tail brings deep stall risk and a heavier fin; a V-tail couples pitch and yaw control through its ruddervators; and a canard foreplane is destabilising, moving the neutral point forward and demanding a forward centre of gravity.
The fourth is wrong. Rudder authority in a crosswind is a matter of fin and rudder sizing, not of tail configuration, and a conventional tail is no worse placed than any other - if anything better, since its rudder is not blanketed by a tailplane above it.
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