Originally Posted by
DaveReidUK
While that might be true, more or less, for a control surface that's hinged at its leading edge (say an aileron), I don't think you can make that assumption for a THS where the pivot point certainly isn't at the L/E..
The question then would be if the pivot point is in front of, at, or behind the center of lift? If the pivot point is in front of the center of lift then the stabilizer should self adjust to zero degrees AoA. If the pivot point is very near or at the center of lift then the stabilizer position would be unpredictable. If the pivot point is behind the center of lift then the stabilizer would deflect to one or the other extreme position, either fully up or fully down.