A picture of a Butterfly that I built for one of our retired guys flying group members is posted in my gallery. I flew the craft a few times before I turned it over to the owner. It preformed very nicely with the .20 HB engine that was in it. But it was new and tight and didn't idle well at first, so the owner removed it and installed a OS .25LA. This craft has spoilers and had a Sullivan steerable tail wheel, but I heard that the tail wheel has been removed. With the addition of the spoilers and tail wheel it took about 2 oz. in the nose to make CG. I am currently building another Butterfly. This one will have the same tail wheel setup as before with a slight mod to it. The spoilers will be much bigger. I haven't decided if I'll go with flaps or ailerons, or both. I will reduce the center section dihedral to about half and make the polyhedral at 2 inches at the tip. I think this wing will fly very nicely with a flaperon setup as long as some rudder is used along with it. Least I'm planning on finding out in a week or so. The HB engine is running very nicely on the auto gyro shown in my Gallery.