I have a stock KR2, not even an S, and it does not have pitch stability issues. If it did, I think they would be referred to as 'PIOs'. What it does have is yaw stability issues, in rough air. In smooth air, it is a very stable airplane, but when it gets a bit rough up there, you really have to stay on top of it. I am sure that the S is better in this regard.
I attribute the lack of pitch instability, maybe wrongly, to higher weight, and very forward CG. When I was building it, I was practically paranoid about ending up with an aft CG problem, which would have been hard to correct. Too much forward is easy to fix. See N64KR at http://KRBuilder.org - Then click on the pics See you at the 2010 - KR Gathering in Richmond, Ky - I39 There is a time for building and a time for FLYING and the time for Flying has begun. Daniel R. Heath - Lexington, SC -----Original Message----- I effectively increased horizontal stab area while leaving elevator the same as the KR2S plans call for. That probably helps with pitch stability...
