I really dont think its a design problem....As I told you in my last post, others including myself have put 50cc engines on this Cap with no problems at all....I flew the heck out of mine and its still in service at this time....The only thing I did was pin the firewall which doesnt have anything to do with your wing failure. I'm not 100% sure why your wing failed, but I'm thinking the wing joiner (weak) or maybe the root.........Whatever it is I hope GP takes care of you and please let us know the out come.