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Which of the following is correct? (a)Aircraft which is statically stable may or may not be dynamically stable

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Which of the following is correct?

(a) Aircraft which is statically stable may or may not be dynamically stable

(b) Lift is equal to weight always

(c) Thrust is only proportional to nose of aircraft

(d) Drag is useful during takeoff

The question was posed to me in an online quiz.

I would like to ask this question from Dynamic Stability in section Stability, Control, and Handling Qualities of Aircraft Design

1 Answer

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The correct choice is (a) Aircraft which is statically stable may or may not be dynamically stable

The explanation is: If an aircraft has initial tendency to return to its original equilibrium condition after being disturbed then, it is said that the aircraft is statically stable. However, it does not mean that the aircraft is dynamically stable as well. Dynamic stability is defined by certain finite time period. Lift is not always same as weight.

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