Trim settings vary with speed, power and other factors such as loading etc.
Most aircraft are rigged to fly with the trim at a fairly neutral setting at crusing speed and cruise power.
A more powerful warbird may have quite marked trim changes with power setting, but equally, that power easily negates the relatively small deflection of a trim tab and elevator.
In fact in combat some pilots deliberately flew with aircraft out of trim, particularly with rudder trim. That way if they were caught by surprise, the aircraft would yaw or pitch more erratically.
Some lower powered aircraft, which might be more affected by drag, use other trim systems. The Tiger Moth uses a spring loading on the base of the control column and the Piper Cub a screw jack which alters the tailplane incidence.
Hope this helps.
Steve
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