"Tail volume coeffiecient" might be what y'all are grasping for. I don't have that stuff in front of me at the moment (I'm in El Paso, for some reason), but I recall seeing a list of tail volume coefficients for various planes in one of the design books that ran the gamut from docile to radical (Spitfire, maybe), and the KR had even LESS than anything else on the list. Now tail volume is not as accurate as stability derivatives, but it's an indication, and the KR was completely off the scale...
Mark Langford mailto:langf...@hiwaay.net see KR2S project N56ML at http://home.hiwaay.net/~langford