Well, you can practice the SPA classes with about anything... I've seen Ed Hartley fly the expert routine with a Goldberg Cub, and he does it beautifully. He flys it at the KCRC field in Knoxville, and calls it the "Pattern Cub". Takes some mixing but it does the routine very precisely! Ed flys a Curare at SPA events for the judges sake.....LOL!!