Directional stability resists yaw motion about which axis?

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Multiple Choice

Directional stability resists yaw motion about which axis?

Explanation:
Directional stability is about resisting yaw, the rotation about the vertical axis. Yaw occurs when the nose moves left or right relative to the oncoming air, and the aircraft’s vertical stabilizer (fin) and fuselage shape generate side forces that oppose that motion. The result is a restoring moment that tends to bring the nose back into line with the relative wind, keeping the aircraft pointed into the wind. The other axes correspond to roll (longitudinal axis) and pitch (lateral axis), which is why they aren’t tied to directional stability.

Directional stability is about resisting yaw, the rotation about the vertical axis. Yaw occurs when the nose moves left or right relative to the oncoming air, and the aircraft’s vertical stabilizer (fin) and fuselage shape generate side forces that oppose that motion. The result is a restoring moment that tends to bring the nose back into line with the relative wind, keeping the aircraft pointed into the wind. The other axes correspond to roll (longitudinal axis) and pitch (lateral axis), which is why they aren’t tied to directional stability.

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