What is "aircraft stability" - IN VIDEO

[Crumpp]

F6F, Hurricane Mk I and Mk II, F4F, Bf-109, FW-190, A6M, and the list goes on...

Glider,

Most aircraft are not positive statically stable and negative dynamically stable stick free. It is an unacceptable characteristic.

Those aircraft all have acceptable stability and control characteristics. What is the issue or what is it you think I am claiming?

You do understand that every aircraft with an issue meant a solution was implemented.

When something is broken, it gets fixed. The Spitfire was fixed by the addition of an inertial elevator. That did not happen though until after the Battle of Britain!!