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Which of the aircraft will be statically stable based on following diagram?

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in Aircraft Design by (701k points)
Which of the aircraft will be statically stable based on following diagram?

(a) aircraft number 1

(b) aircraft number 2

(c) aircraft number 3

(d) same static stability for all 3 aircrafts

This question was posed to me in class test.

The question is from Longitudinal Static Stability and Control-1 in chapter Stability, Control, and Handling Qualities of Aircraft Design

1 Answer

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Best answer
Right choice is (a) aircraft number 1

To explain: As shown in the diagram typical pitching moment coefficient curve is represented. Aircraft number 1 will be statically stable. As can be observed in the diagram if aircraft number 1 is disturbed by some forces; let’s consider some upward direction gust is encountered. At such conditions it will generate negative pitching moment to oppose the upward deflection and hence, it has initial tendency to return to the original equilibrium position. Therefore it is statically stable.

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