I learned on a flat bottom airfoil trainer and I hated it. I couldn't wait until I flew something with a semi-symmetrical airfoil just so it would fly more realistically. If I were you, I'd give that PT-40 to a newby and get something made for a .60 that's meant for intermediates. My 2nd plane was a Goldberg Falcon 56 MkII and I learned more with it than any other plane I've owned. If you have a .60, try the Skylark ARF or something similar, you'll have a lot more fun than trying to bash that PT-40 into a more maneuverable plane.