Hey Savage, Welcome to an awesome thread where you can find out everything you want to know about the UCD's and some things you don't. Depending on your skill I would say the UCD's make great second planes but I think that with a 46 it will do only mild aerobatics and you may get bored with it quickly. While an 82 Saito or 91 isn't required to fly it it will sure make it tons more fun to fly and aerobisize it, much more than a 46. In the long run you'll probably be happier with at least an 82 4 stroke. [8D]