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Me thinks I have wondered about this a little too. Most planes I have had required a little rudder imput on the uplines. But the plane does not "yaw" when I feed in a little rudder, it just goes up straight.

Seems I had at least one kit that the vertical stab was actually built with it in on the plans ?

Next season I am going to do more of what most seem to do these days and really try to get a plane to fly as completely neutral as I can.