Yup, my 37% Ultimate weighs about 26 pounds and my BME 110 which I estimate generates about 80# of thrust with a 27x10 is just enough to make em nice and round. Ive seen guys do it with a DA100 on a plane of the same weight but its not really enough authority to really drive through the upline part of the loop with gusto. The plane wobbles a little as it slowly decelerates as it climbs. Thats by no means a shot at DA engines it just drive home the point that the maneuver takes mega power in the upline,,,,, and MEGA rudder authority in the downline.[8D]