my second plane was a goldberg clipped wing cub w/saito 80. i now have a glodberg clipped wing w/barn door ailerons and full flaps, pull/pull rudder and split elev pushrod. has an os 70 fs. a cub is a great aircraft to enjoy flying, practice take offs and landings, you can learn a lot from a cub, i like slipping it in at landing. can be a squirrel on asphalt. you didn't say if it's .40 or .60. i have the .60 covered, but not assembled yet. a cub is a great float plane too, something you can do at a later date. on the .40 size i'd put an os 70fs on it w/13x6. the equipment you use can be reused in another aircraft at a later date, but why, who doesn't love a cub. on all mine i use coverite cub yellow, looks great. don't right off the cub so soon, it's a good stepping stone, you can do a lot with them and the os 70fs has lots of power for it. if you've got it so far along, finish it