Discussion
Consider the following statements about the neutral point:
1. It is the centre of gravity position giving zero moment slope.
2. It defines the aft centre of gravity limit.
3. It is the point through which the lift always acts.
Which of the statements given above is or are correct?
Answer: C
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: the neutral point is the centre of gravity position at which the moment slope is zero, and it therefore sets the aft limit, with a margin held back from it. Statement 3 confuses the neutral point with a fixed centre of pressure - it is the point through which a *change* in lift acts, not the total lift, which is why the moment about it does not vary with incidence.
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