A guy at our flying field has a Magnum 80 in his UCD 60. Flies it pretty good, but most 3D Manuvers are not possible. Plus we're only about 400-500 ft above sea level. The Magnum 80 has about as much power as most 70 size four strokes, but it's a good engine non the less. I will I had one to put in my Something Extra, but I may try a Magnum 70.