Rkramer,
The Avistar is a trainer in my book. NC's club has a silly rule that will not allow her to fly it just because it doesn't have a flat bottomed wing. It is still a trainer.

TailSkid,
As for putting a flat bottomed wing on an Avistar, I don't know for sure, but the Hobbico Superstar looks almost exactly the same except it has a flat bottomed wing, it might work on the Avistar. Tower has it for $75. Maybe this is the best way to go...

Good Luck

Allan