Volfy, I was never able to find the tail pieces so I really don't know what failed. But, it was not the glue joints at the fuse as they were still intact. The conclusion that most of us reached was that the weak tail structure began to flutter and simply blew apart. I would strongly advise you to use solid balsa sheet for all tail surfaces along with good strong tail braces. It won't be that much of a weight factor...........Russmall