We flew our 60 Stick with an OS91fx. Other flyers at our field swore it would be too much, but the combination gave us nothing but big grins. Takeoff with 6 feet of roll, easy hovering, aerobatics at half power. If a landing went sour at the last second, you could floor it and go up like an ejection seat. Still, you could drop the flaps and land like a butterfly.