Discussion
Statement I: A statically stable aeroplane is not necessarily dynamically stable.
Statement II: Static stability concerns only the initial response to a disturbance.
In the light of the above statements, choose the correct answer.
Answer: C
Correct answer: Both Statement I and Statement II are correct
Both statements are true, and the second is why the first holds. Static stability asks only whether the initial moment following a disturbance acts to reduce it. It says nothing about what happens over the seconds and minutes that follow, which is the province of dynamic stability. An aeroplane with a positive static margin can still have a divergent phugoid or an unstable Dutch roll, so the initial tendency to return is necessary but not sufficient for the motion to actually die away.
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