I too had an Alpha and the same problem. I often checked the covering, but is a super flyer. I also had a 60 Thunder Tiger. I wanted more speed, so I put a tune pipe on it with the Super Tigre 60(Crazy).Big mistake. Trainer are not speed planes. About the 3rd flight at the MPH I was flying, the covering on 2/3 of the top of one wing came off.[X(] I had very little control, and all I could do is call for HELP! The person that trained me was there and grabed the radio. He got her down, but was hard and fast (some damage). He looked at me and said "I told you so Crazy."[:@] The Tunder Tiger flys today to say the least with out a tune pipe. You live and learn. Glad to hear you got yours down safely.