> Sent: Sunday, September 27, 2015 at 7:05 PM > From: "Flesner via KRnet" <krnet at list.krnet.org> > To: KRnet <krnet at list.krnet.org> > Cc: Flesner <flesner at frontier.com> > Subject: Re: KR> Fiberglass/Carbon Fiber combo > > > > Rather than extending the spars outward, > > could I extend the elevator to the rear, > > creating more control surface area? ? How far would I extend? > > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > I'm not an engineer but as I understand it , it's > not the size of the control surface that needs > enlarging but the fixed horizontal surface for > greater pitch stability. Jeff Scott also > enlarged the rudder as I recall and I think on > his web page is his reasoning and the results of > he changes which he said are very positive. > > Larry Flesner
I did extend the rudder as, in my opinion, my plane lacked rudder authority. Extending the rudder cured that issue. However, when I built the significantly larger horizontal stab and elevator, I do wish I had done the same with the vertical stab. While my vertical stab has more area than teh stock -2 tail, in my opinion, it does demonstrate yaw instability that really isn't necessary. It's addressed by just resting my feet on the rudder pedals (as if I had someplace else to put them), but, in my opinion, a larger vertical stab, probably about the same size as the -2S vertical stabs, would have improved the yaw stability. -Jeff Scott Los Alamos, NM
