I have done both. ? The original configuration of my KR had the trim servo mounted in the horizontal stab with a short nyrod through the center of the stab spar and the elevator spar to actuate the trim tab. ?I flew with it that way for 500 hrs and the trim worked just fine.
When I cut that tail off and built the larger tail with the airfoil templates from Mark's web site, I first tried a spring biasing trim. ?That was unsuccessful as he control pressures changed with changes in speed, so the trim was never right. ?In 2013 I removed the spring trim and built the trim servo into the elevator with a tab. ?That works very nicely. Niether of the tails on my KR were mass balanced, and all three configurations have been tested well in excess of the 195 mph VNE. Photos can be found on my web site at <http://jeffsplanes.com> Jeff Scott Los Alamos, NM > ----- Original Message ----- > From: Chris Gardner > Sent: 01/10/14 04:38 PM > To: KRnet > Subject: Re: KR> Trim servo in elevator > > I also have the Ray Allen servo mounted close to the elevator spar (floxed > aluminum angle bracket to the spar) > Works great and no flutter issues in spite of no mass balance. > Tested to 180mph after which I chickened out. > > Chris Gardiner > > > > > > -----Original Message----- > > > > Have you or anyone reading this seen the servo mounted in the horizontal > > stab with a shorter nyrod directly in line with the tab?
