Discussion
Which pair of measures would together address a marginal Dutch roll and a marginal spiral at once?
Answer: A
The two augmentation loops attack one mode each without the aerodynamic trade: the yaw damper raises Dutch roll damping and the wing leveller suppresses the spiral. Every purely aerodynamic pairing runs into the criterion \( L_\beta N_r - N_\beta L_r \), in which dihedral and fin volume pull opposite ways, so a larger fin with more dihedral improves each mode by an amount the other change partly undoes. That is the structural reason augmentation, rather than more surface, is the modern answer.
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