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It's interesting that all tested aircraft displayed longitudinal dynamic instability.
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Where does this come from??
It is patently false as a generalization.
While many WWII fighters were unstable in very specific conditions such as in climb power with a specific speed range or landing configuration.... most were stable and met the requirements.
It is was very rare for a design to be unacceptable over the range of the envelope such as the Spitfire.