A newbies impression of the 109 and spit

[JtD]

Originally Posted by Crumpp

Right, I did the bold.

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

The longitudinal dynamic stability (Long Period Oscillations) was neutral or negative as recorded by the NACA.

, because NACA says:
regarding dynamic stability:

only the short-period oscillation is dealt with here

and regarding neutral or negative stability which they recorded:

static longitudinal stability

.
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.