I was surprised to see a different thread, today, about a TT trainer 40 wing breaking. The pilot had used it for his training period, and was still using it for aerobatics. After many many sessions of aerobatics, the wing broke on a pull-out (at idle.)

The thing that surprised me was that it seems there is no wing joiner - a spar joiner that sticks into both wings to the depth of the second or third rib. I am accustomed to seeing a joiner in the ARF plane wings, and (from the description) this plane doesn't use one.

Two people in the thread described bolting the wing halves together, adding glue or epoxy, and still having the wing come apart (after considerable time.)

If you use this plane for your training period, you might want to remember whether there's a spar joiner or not. If those posts are accurate, I would not do a lot of loops with the plane. Apparently, it is fine for ordinary training purposes.

Best wishes,
Dave Olson