Discussion
A wing alone with its centre of gravity behind the aerodynamic centre is
Answer: B
Correct answer: Statically unstable in pitch
The aerodynamic centre is the point about which the wing\'s pitching moment does not change with incidence, so all of the lift increment produced by a disturbance acts there. If the centre of gravity lies behind it, that increment sits ahead of the centre of gravity and pitches the nose further up, increasing the incidence that caused it. The moment slope is positive and the disturbance grows. Only with the centre of gravity ahead of the aerodynamic centre does a wing alone restore itself, which is why a conventional aeroplane needs a tail to move the neutral point aft of the centre of gravity.
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