It depends on the module. In general however, Warbirds and the like will vary with airspeed FBW ai

It depends on the module. In general however,
Warbirds and the like will vary with airspeed
FBW aircaft like the F18 will by static
Helicopters will be static. Spring force will go to 0 when trim release is pressed

The F4 has the most advanced implementation. The gain varies by airspeed and the bobweight is simulated by shifting the centerpoint in response to g-loading.

In aircraft where the stick moves in response to trim input, that will also be handled by the centerpoint of the spring effect.
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