Discussion
Consider the following component and contribution pairs:
Tailplane - Strongly stabilising
Fuselage - Generally destabilising
Wing with aft centre of gravity - Destabilising
Tailplane - Destabilising
How many of the pairs given above are correctly matched?
Answer: D
Correct answer: Only three
The tailplane is strongly stabilising, the fuselage is generally destabilising, and a wing with the centre of gravity aft of its aerodynamic centre is destabilising - three correct pairs. The fourth, which calls the tailplane destabilising, contradicts the first: the tail is the component that makes the conventional layout stable, since it is the only one supplying a large negative contribution.
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