Shd3920; Don't sweat the small stuff. When my father taught me this hobby, (he's 80 and still flies), he always told me to use the KISS method. (Keep It Simple Stupid) He seemed to like to use that phrase quite a bit around me . Anyways, a simple, reliable 2 stroke is all you need to learn on. An OS LA engine in the 46 to 61 range or take a look at the Evolution motors used in some of the Hanger 9 trainers. You want to be able to concentrate on your developing your flying skills, not your vocabulary of 4 letter words trying to start a fussy engine.