Make sure the front and rear wing saddle mounts are better tied to the vertical members on the fuselage sides. I used simple plywood gussets and they worked fine. If the wing bolt holes are in a solid block then convert it to twin nylon bolts front and aft, or use a single metal bolt in a big washer and a T-nut. I have owned three RH80s with nearly every size engine from a .60 to 1.8. Make sure the control surfaces are stiff and have fun.