Discussion
Which of the following does not describe the neutral point?
The point through which the lift always acts
The centre of gravity position giving zero moment slope
The aft limit of static stability
The point where the static margin becomes zero
Answer: C
Correct answer: The point through which the lift always acts
That describes the centre of pressure, which travels with incidence and is not fixed. The neutral point is the centre of gravity position at which the moment slope becomes zero, and so equivalently the point at which the static margin vanishes and the aft limit of static stability lies. The three correct descriptions are three ways of saying the same thing; the odd one out belongs to a different concept altogether.
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