Discussion
The static margin is the distance between
Answer: B
Correct answer: The neutral point and the centre of gravity
The static margin is
\[ K_n = \frac{x_{np} - x_{cg}}{\bar{c}} \]
expressed as a fraction of the mean aerodynamic chord. It is positive, and the aircraft statically stable, when the centre of gravity lies forward of the neutral point.
The neutral point is a property of the aerodynamic configuration; the centre of gravity moves with loading. So the aft centre of gravity limit is set by the minimum margin the design requires, typically around 5 per cent for a transport, and the fourth option confuses that limit with the margin itself.
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