A guy at our field built a Dynaflite Butterfly, took the mid dihedral out of it (built the entire wing flat, and it has dihedral only at the roo)t. He flies it with a .25, takes it up until you can hardly see it, pulls back to idle, and basically flies it like a sailplane, if he gets too low to suit him , he just throttles up and flies it back to the stratosphere. I've watched him fly over 30 minutes before he ran out of fuel, and then he glided another 15 minutes before he landed. The plane flies on 3 channels, and is a nice looking plane.