Pizza, What I did was to take Tim Harts design for the 3DX. I think those plans are on the FoamyFactory site. I wanted more than the two dimensional flat foam models. They lack when it comes to real flight. I did my best useing the TLAR method, 'that looks about right'. Call it dumb luck or maybe the attention given during the layout and design stage payed off, but this is one good performer. 3D Extra Foam. I didn't go with a fun fly wing, thats next, and yes, with this airfoil it will snap and spin, yet floats in comfortably. It will handle the speed as well. With the box construction fuse there isn't any flex in the tail like the profiles. I didn't want to wait for the tail to catch up in a manuever. The wing has one foam spar on each halve and believe it or not, the wing halves are just plugged into the fuse sides over a 1/4 inch collar that sticks out each side. No joiner, just a male female fitting glued on. No joiner and no CF in the wing and the results are no flex. All the strength comes from opposeing forces. Next I'm going to plagerize the Pigi. I can also see larger models. BTW, aside from assembling a couple ARFs, I never built a plane before. Glad you like it, Joe