Trust me, you want the turtle deck on the Ultra Sport. It's probably the biggest reason why the plane flies so well in knife edge. The Ultra Sport and the Kaos are pretty similar planes. In fact, they are almost identical except for the turtle deck (and a couple of other very minor differences). The Kaos is "so-so" in knife edge, while the Ultra Sport is "OUTSTANGING" flying knife edge.

I know that the turtle deck is a royal pain the rump to build, but trust me it's well worth the effort. It's one of the things that makes the Ultra Sport such a great flying plane.

Ken