When I had the original tail on my KR, the MAC trim servo was mounted in the horizontal stab with a short nyrod passing through both spars to the trim tab. ?That worked reasonably well. ?I tried using a spring biasing trim when I built the larger tail for my KR in 2005. That was never satisfactory. ?I have the tail off my KR installing a Ray Allen trim servo now. ?This time the servo is being mounted in the elevator against the elevator spar. ?Lots of photos of the build process at <http://jscott.comlu.com/KR/2013%20Updates.html> ?I pulled the elevator off to build a trim tab 2 weeks ago and finished the modifications (other than paint) today, so it's not a long process.
-Jeff Scott Los Alamos, NM