This whole thread had been a REALLY outstanding tutorial. After working through this on TWO Yak's, (the BME 30%, and this morning the QQ 73"), I am now TOTALLY convinced that the angular variation of travel due to rotation asymmetry is THE culprit. And of course, that is clearly made WORSE when OTHER mechanical variations creep into it.

For the VERY FIRST TIME.... it is absolutely CLEAR to me now WHY "Programmable Servos" is "The Solution", and I honestly never bought into that before.

OTOH - we are splitting some pretty fine hairs now, when using 12 or 18" pointers on elevators moving 35*....it is ALSO clear that we MUST run ATV's at the highest settings possible, which is also somewhat of a "new" revelation to me, as I was always one of those "stay around 100%" guys.

MikeGlavin - if you really want to do the math, it will be fine, but I have really come to understand what's going on now, and have corrected the mechanical aberrations of both of these fine airplanes. They will only be better now!!!!!!!!

Finally - assuming that all of this is ABSOLUTELY the same on ailerons, even if only one servo connected per side???
Believe it or not, guys, although a little painful, this has been a GREAT learning growth for me, and I appreciate all of you helping me out!!!!!!!!! THANK YOU!!!!!!!!!