Discussion
Assertion (A): An aeroplane can be statically stable yet dynamically unstable.
Reason (R): Static stability concerns only the direction of the initial response to a disturbance.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the second explains the first. Static stability is a statement about the sign of the moment immediately after a disturbance, nothing more. Whether the resulting motion converges depends on the damping and the coupling between the modes, which is dynamic stability. A statically stable aeroplane may have a lightly damped or divergent phugoid, oscillating in speed and height with the initial restoring tendency present throughout.
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