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Aircraft is said to be statically stable if __________

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Aircraft is said to be statically stable if __________

(a) it has initial tendency to come back to its original equilibrium condition after being disturbed

(b) it has tendency to return to equilibrium state with the help of pilot’s input

(c) it has more lift than weight always

(d) it has more thrust than drag

I have been asked this question in semester exam.

This intriguing question comes from Longitudinal Static Stability and Control-1 topic in division Stability, Control, and Handling Qualities of Aircraft Design

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The correct choice is (a) it has initial tendency to come back to its original equilibrium condition after being disturbed

To explain I would say: An aircraft or an object is said to be statically stable if and only if it has initial tendency to return to its original equilibrium position after being disturbed. Lift is not always greater than the weight. At cruise it will be equal to weight of the aircraft.

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