Discussion
Statement I: Moving the centre of gravity aft increases longitudinal stability.
Statement II: Static margin is the distance from the centre of gravity to the neutral point.
In the light of the above statements, choose the correct answer.
Answer: B
Correct answer: Statement I is incorrect but Statement II is correct
The second statement gives the definition correctly. But it refutes the first rather than supporting it: moving the centre of gravity aft brings it closer to the neutral point, so the static margin shrinks and stability decreases.
Taken far enough, the centre of gravity passes the neutral point and the aircraft becomes unstable, which is why an aft loading limit exists. The trade is real, since an aft centre of gravity reduces the tail download and hence trim drag - a gain modern transports pursue deliberately with fuel transfer to a tail tank.
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