Check out some of the builders' links on www.krnet.org I think I saw a single seat KR2S on there. The S in the KR2S stands for stretch, and as such it is slightly longer than the standard KR2. This was, I believe, to resolve some of the pitching moment issues related to closely coupled aircraft. In other words, it is longer to give it a little more pitch stability, the horizontals don't have to work as hard to counteract the action of the wing's lift against the CofG
Just my humble opinion. Peter Bancks.
