Dan,
I definitely think you have an AFT CG problem, although that number indicates you are right in the center. First, I would carefully check those numbers. I flew a KR with an aft condition and it acted just like you describe. At one time I considered the 2200, but it would have been too light, so if I were to use a Jabiru, it would have had to be the 3300 and then I would have to move the engine forward slightly. Here is some data from my W&B Datum is Firewall = 0 inches Leading Edge of wing = 12.3125 inches Forward C.G. = 20.125 inches Note: Specifications state 8-16" aft of the inboard wing leading edge Rear C.G. 26.125 inches For N64KR, the CG range is 8" to 14" aft of the inboard wing leading edge. See N64KR at http://KRBuilder.org - Then click on the pics See you at the 2012 - KR Gathering in Mt. Vernon, Il - MVN - 40th Anniversary There is a time for building and it is over. Daniel R. Heath - Lexington, SC http://www.krbuilder.org/MyUSA/