The Magic Fly from M. F. A. was designed for a geared brushed electric motor. The plan also shows a variation for direct drive. The customer who requested it told me to cut it as shown on the plan, and he would customize it for his equipment. So that’s the way I did it, just like the plan. It looks like it would work really well with a glow engine, or you could add a plywood firewall on the front and install a brushless motor.