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It means the aircraft has precise trim control input. It is already stable.
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Just to clarify, trim forces will change over the range of an airfoils angle of attack. In general, for every speed there is a specific trim setting.
I am not saying the Bf-109 does not require trim input. There is a very tenious connection. It is entirely possible to have an unstable aircraft that trims very positively just as it is possible to have a stable aircraft that cannot be trimmed.