RE: Wildwiz 40 ?
I had a WW (notice I said "had") and it was one of my all time favorite planes. I flew mine with a GMS .32 and it smoked! The WW .40 has no ribs, just cap strips bent over a tapered spar, it is a very tough airplane.
What happened was I was doing some full power dives and passing down the runway as fast as I could make it go when all of a sudden the rudder started fluttering and ripped off the frame. Shortly (very shortly) after that we heard a POP....the darn thing exploded in mid-air, builder error. When the tail ripped off it made huge holes in the covering and when it filled with 100+MPH air that was all she wrote!
I have since scratch built another, slightly thinner, longer and narrower, with triangle stock reinforcing the tail and it's a real hoot as well, I never go to the field without it.
Risk Haslam is from KY so I see him every now and then at fly ins and he is a real nice guy. He has designed several deltas and disk planes, give him a try. BTW the Wizz .15 sizzles as well.