When I mean bad "CG," I mean the CG given in the instructions are not correct. I build my planes with a lot of careful attention to detail and make sure everything is in place before my maiden flight. All the ARFs I put together that are not the China model types have flown with no problem. But the two China Models I did maiden wouldn't stay in the air at all. The 3rd China Model I'm putting together right now won't see flight time until I am sure the CG is what it should be. I just don't trust the instructions. I'll be combing the forums to make sure it is correct. Also, I found a website that calculates CG based on measurements of the wing. But the website was discovered after the two crashes. Live and learn.