I have an ASP .61 on my LT40! Max it out and have some fun. Use dual aileron servos for flaperons/spoilerons. Move the cg back. Take the diehedral out of the wing and glass the center when you put it back together. Build a bigger split elevator to allow for a MUCH bigger rudder. Those mods should keep you busy for awhile! Just remember it's still a trainer, but much more aerobatic. No 100mph dives or flybys, even with the mods.