OK, a 10 year old thread, cool to see them pop up like this. The Kaos was a Bridi design and as I recall a 7 time class C winner. Probably one of the best flying planes of all times. Blue Jay Models is the cutter of the originals these days and the prices haven't gone up much from the days when Joe was still cutting them. I have flown them in all the different sizes and they all seem to fly the same, the smaller 40size is just quicker at everything. Blue Jay also cuts the Dirty Birdy that has a better look to it and will hold a better knife edge. My favorite is the 60 size but I liked the 80 incher as much as any of them. In the classic pattern forum there is a sticky just for the Kaos if that says anything to you.