Discussion
Sideslip is the disturbance that drives the _____ mode, since it produces both a yawing moment from the fin and a rolling moment from dihedral effect.
Answer: C
It is the Dutch roll. Sideslip is the state that couples yaw to roll: the fin turns the nose into the relative wind while the dihedral effect lifts the leading wing, and the two moments together sustain the oscillation. The spiral does involve sideslip but is not an oscillation, and it is driven by the imbalance between the same two derivatives rather than by their combination. Roll subsidence is a roll-rate decay that needs no sideslip at all, and the phugoid is longitudinal.
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