I concur with everyone else's comments, 40oz/lb should fly great. Will fly more like a scale bird than sport, but not by much. Mustang flaps are pretty effective, so keep some power on all the way to the field, cutting it when your just about to touch down. Don't try to slow it down too much on the approach. Just let it come in and land on the mains, don't try to three point it right off the bat