Discussion
Which surface supplies most of the directional stiffness of a conventional aeroplane?
Answer: A
The vertical tail does: its side force in sideslip acts on the tail arm and turns the nose into the relative wind, which is what makes the yawing moment with sideslip positive. The wing contributes very little directional stiffness and its main lateral role is the dihedral effect, a rolling moment. The horizontal tail's side area is small and close to the axis of symmetry. Nacelles and the forward fuselage are usually destabilising, since their side force acts ahead of the centre of gravity.
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