What are the limits these 40 trainer airframes can handle? I was flying my Hobbico Superstar today doing rolls, loops, etc then when it picked a lot of airspeed the wing separated in flight. At first I thought I exceeded the airspeed limit but after recovering the wreckage from the scrubs I found that the previous owner used too little epoxy in joining the wing halves. Now I don't know if i should get another trainer or perhaps a low wing plane like a Goldberg Tiger? My flying is still amateur grade. I can take off and land safely but my turns are still a bit sloppy.