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Looking at the easy to understand diagrams CaptainDoggles linked, neutral static stability is exactly the problem NACA had with the Spitfire
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Good diagrams and I have some others that will make it clearer for you all.
That diagram would make you think the elevator is held constant but it is not.
Keep in mind when that report was written there were not any standards of the day. It is not like testing processes or airworthiness. It was a very new science that was not covered in convention. In the 1980's there was even a "counter-revolution" in stability and control engineering.