finaly done with the build. Hope to fly tomarro, weather permiting. But for you other guys building the same plane, i used an os .91 4-stroke wieghing in at 24 oz.. To balance the plane at the recomended cg (127mm or 5") i had to put My dual batterys at the front of the plane and still added 6oz of lead. That makes me think now, I can go with a bigger engine like a os 120. It wieghs in at 33 oz. and has about 1/2 hp more than the 91. Any way, just a thought for you guys who havent got a motor yet.