Can reduction in pitching moment of a car be referred to as improved pitch stability?
Or is this term strictly only with regards to aircrafts?
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According to the wiki regarding pitch stability in aircraft, the terminology generally refers to the tendency of an aircraft to not diverge along the lateral axis when the stable configuration is slightly changed. That is to say, a level aircraft can be nosed over (pitch down) which will result in the aerodynamic forces causing the nose to raise itself, barring any additional external input. The same applies to nose-up forces.
One can certainly reference a pitching movement for a motor vehicle, but such movement is counteracted by suspension and suspension dampers, not aerodynamic controls or forces.
In the automotive world, the terminology of which I am most familiar is "braking induced dive" which refers to the nose of the motor vehicle dipping when braking is applied. Stability is not usually a term applied to this action.