Discussion
A light single-engined aeroplane with pronounced dihedral and a small fin is flown hands-off in smooth air.
Which behaviour is most likely?
Answer: B
Plenty of dihedral with a modest fin puts the spiral criterion firmly positive and keeps the Dutch roll's roll content moderate at cruise lift coefficients, so the aeroplane is docile in both slow modes - which is why trainers are built this way. A poorly damped Dutch roll with a fast spiral is the swept-wing jet's problem, not this one's. Roll subsidence is stable on any conventional wing, and the short period is longitudinal and unaffected by either change.
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