I fly my H9 1/4 scale super cub with a super-charged YS-120 .. flys great. You could also use a Saito 180 or a 30-50 cc gasser. I'm finishing a 22lb Lift Meister (huge 105in wing span) and using an older 50cc Byron Mustang engine. It would fly aboy the same as a 1/3 scale cub.