Discussion
Which of the following does not contribute a destabilising pitching moment?
The tailplane
The fuselage
A wing with the centre of gravity aft of its aerodynamic centre
A canard foreplane
Answer: A
Correct answer: The tailplane
The tailplane is the stabilising component: sitting well aft, an increase in incidence raises its lift and produces a nose-down moment. The fuselage is destabilising, a wing with the centre of gravity aft of its aerodynamic centre is destabilising, and a canard foreplane, being ahead of the centre of gravity, is destabilising in itself. Everything forward of the centre of gravity tends to destabilise; the aft surface is what restores.
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