At less than 1 lbs advertized weight and 285sq in wing area it will not take much engine to get this flying. I bet an old Cox .051 TD would make it fly but not 3D. The OS .10 LA would give this plane the required power but I would be concerned about how fragile this plane might be when subject to the vibration. In the pictures the wing looks like it was built up with minimum structure and weight in mind. I am not saying it can't be done by any means but it will be challenging.