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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.
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They are talking about static stability. Wow, shows you how much things have changed and how new stability and control was as a science during WWII.
Static instability is horrible in an airplane. Seriously...the FAA and ICAO would send you back to the drawing board if you were seeking certification.
http://www.law.cornell.edu/cfr/text/14/23.173
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The longitudinal dynamic stability (Long Period Oscillations) was neutral or negative as recorded by the NACA.
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Poor choice of words on my part. Long period Oscillation has specific meaning and it should read:
The longitudinal dynamic stability (Oscillations
over time) was neutral or negative as recorded by the NACA.