Discussion
A high-wing aeroplane with a large fin and no geometric dihedral is most likely to show
Answer: C
A large fin gives directional stiffness, so the Dutch roll has ample frequency, while the spiral criterion suffers because the fin term is large and the dihedral term is supplied only by the wing's high position. High-wing effective dihedral is real but modest, so the spiral is marginal at best. The Dutch roll cannot be absent, since the coupling that produces it is always present. Roll subsidence is stable on any conventional wing, and longitudinal behaviour is a separate problem altogether.
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