Discussion
A ventral fin below the fuselage improves Dutch roll behaviour because its side force
Answer: D
The ventral surface's side force acts below the centre of gravity, so its rolling moment opposes that of the fin above and reduces the net roll produced by sideslip. Less roll content means a better damped Dutch roll and a smaller roll-to-yaw ratio, which is exactly why ventral fins appear on aeroplanes with plenty of sweep. Adding to the dihedral effect would make matters worse. It adds negligible inertia, and it increases rather than reduces directional stiffness.
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