This video demonstrates making reversing turns on a flphg (foot launch powered hang glider) by only angling the thrust line. By angling the body so it is not parallel to the keel, the thrust from the engine tends to turn the glider to the side that the pilot's head is pointing. A detailed explanation of this is discussed in http://wind-drifter.com/handling.php
Note: this glider, at the time the video was made, had a slight left turn (with or without power). That is the reason the glider turns to the left much quicker than to the right. Also, because of the slowness of the turns, it may be always be immediately obvious which way the glider is turning - an easy way to tell is where the wingtip is - below the horizon in a left turn, above the horizon is a right turn.