I've had two. Good flyer, but heavy. Keep up the speed. The wing is plenty strong, the center is wrapped in an 8" glued pvc center section, after the glued brace is inserted. If you folded the wing, probably the glue was not compatible with the materials. My planes suffered splitting of the seams on the tail surfaces. You should dribble CA inside the stabilizers, and the control horns, before assembly. Rough sand surfaces before gluing.