Discussion
Consider the following statements about longitudinal stability:
1. Static margin is the distance from centre of gravity to neutral point.
2. A positive margin means the centre of gravity is forward of the neutral point.
3. Moving the centre of gravity aft increases the static margin.
Which of the statements given above is or are correct?
Answer: D
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: the static margin is the centre of gravity to neutral point distance, and it is positive when the centre of gravity is forward of the neutral point. Statement 3 reverses the relation - moving the centre of gravity aft brings it closer to the neutral point, so the margin decreases, which is precisely why an aft limit is needed.
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