Discussion
Dutch roll damping is supplied chiefly by
Answer: D
The damping terms are \( N_r \), the yawing moment due to yaw rate, together with the side force term \( Y_\beta/u_0 \), both negative on a conventional aeroplane. The fin generates most of the first, since a yaw rate changes its local incidence in proportion to its arm. Rolling moment due to sideslip is the dihedral effect, which sets the roll content of the mode and generally makes the damping ratio worse rather than better. Ailerons and elevator are controls, not sources of damping.
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