Crashes in this hobby are a part-and-parcel. You have to accept it, there are more superior powers around you and some times crashes can happen. The important thing is to learn from them. Sometimes crashes happen for no fault of the controller like radio interference. Here are a couple of pics of Ashwin's gas trainer that had a fairly massive spiral onto Terra-ferma. It's fixed and happily flying now. Although an unpleasant thing, I'll try to get pics of damaged models...or hopefully I wont....