Sorry but have u read these articles?? These are first impression of a Pilot flying a new and different type of Plane. Of course it reacts totally "unnormal" as what he imagines and knew from the Hurricane.
And just because the Spit reacts quickly on a pitch input doesnt mean that she is a unstable gun platform in my opinion.
Thats why u practise as a Pilot to understand the plane and get used to it.
And thats why u have planes for "rookies" and "experts". But u can't compare or mess this with data because every Pilot has his own flying Skill and learning curve.
wikipedia: "Longitudinal stability
The longitudinal stability of an aircraft refers to the aircraft's stability in the pitching plane - the plane which describes the position of the aircraft's nose in relation to its tail and the horizon.[1] (Other stability modes are directional stability and lateral stability.)
If an aircraft is longitudinally stable, a small increase in angle of attack will cause the pitching moment on the aircraft to change so that the angle of attack decreases. Similarly, a small decrease in angle of attack will cause the pitching moment to change so that the angle of attack increases.[1]"
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