Discussion
The rolling moment derivative with yaw rate is positive because
Answer: D
In a yaw, the outer wing moves faster through the air and generates more lift, rolling the aeroplane into the turn. That term multiplies the fin's stiffness in the spiral criterion, which is why a large fin is spirally destabilising. The fin's side force does produce a rolling moment, but that is part of the dihedral effect term rather than this one. Aileron float is a stick-free control matter, and a stall is a large-disturbance phenomenon outside the linear derivative model.
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