Discussion
Assertion (A): Aft movement of the centre of gravity reduces longitudinal stability.
Reason (R): Static margin is measured from the centre of gravity to the neutral point.
Select the correct answer from the options below.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the second explains the first. The static margin is the distance from the centre of gravity to the neutral point, so moving the centre of gravity aft shortens that distance and the margin shrinks.
Carried far enough the centre of gravity passes the neutral point and the aircraft becomes unstable, which is what fixes the aft loading limit. The trade is worth noting: an aft centre of gravity reduces the tail download and hence trim drag, which is why modern transports move fuel aft in cruise within the permitted envelope.
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