We use a super hots blown up to 3.5m, Its powered by a 3w 157 and it flies like a massive fun fly. Short landings are easily achieveable but the long tow line make that a little harder than normal. Power is insane and it will pull 40lbs gliders up at 45-60 degrees.
We currently have a cessna 195 being built wich will be electric powered. Should make a great tow plane.