Discussion
Which of the following does not lie aft of the stick free neutral point?
A typical cruise centre of gravity
The stick fixed neutral point
The manoeuvre point
The stick free manoeuvre point
Answer: B
Correct answer: A typical cruise centre of gravity
The centre of gravity must lie forward of the stick free neutral point for the aeroplane to be stable with the stick released, and the aft loading limit is placed to guarantee it with a margin.
The other three all lie aft of it. The stick fixed neutral point is aft of the stick free one, because a floating elevator weakens the tail. Both manoeuvre points lie aft of their respective neutral points, because pitch damping adds a restoring moment in a pull-up. The ordering runs centre of gravity, stick free neutral point, stick fixed neutral point, then the manoeuvre points.
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