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Originally Posted by Crumpp
Right, I did the bold.
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In that case, maybe you can next time avoid putting your words in my mouth by using proper formatting.
On the contents you added, I won't disagree with what you've said regarding the stick fixed and stick free stability testing, as it is absolutely right. You should, however, keep in mind that I try to explain things in a way that the concept can be understood by anyone interested, not just those with a suitable education or years of experience in the field. In my opinion, it is easier to understand "no trim change with constant elevator when speed changes" than to understand a description of an initial reaction to displacement.
However, I disagree with
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The longitudinal dynamic stability (Long Period Oscillations) was neutral or negative as recorded by the NACA.
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, because NACA says:
regarding dynamic stability:
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only the short-period oscillation is dealt with here
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and regarding neutral or negative stability which they recorded:
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static longitudinal stability
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.
To sum it up, NACA did not record long period oscillations for the Spitfire and the assessment of neutral or negative stability was made for static longitudinal stability.