A couple of buddies and myself have them, and I use an old OS 26, 4 stroke on mine. We love to fly them late in the evening, and idle them until it's almost dark, and then fly them until there is hardly any light left. Very relaxing style of flying. It is not unusual to get flights of more than 30 minutes with these birds and the slow flight. They really fly themselves, and we occasionally, "Disturb" them to make turns and keep them in view. Enjoy,

Bill, AMA 4720
WACO Brotherhood #1