Flown mine all summer with a Satio 150 under the cowl, swinging a 17 X 6 prop. Plenty of power for knife edge loops and such. I have had three dead sticks with it due to mufflers coming loose. Absolutely no issues. The plane had a decent glide ( I would say above average for a bipe) and I was able to make the runway with ease each time. The Ultimate is aerodynamically clean for a bipe. She does pretty well without power, unless, of course, one has it balanced nose heavy. I was able to get the CG back with the servos and battery. I wouldn't put anything smaller than a 125 in her. But then, I like plenty of reserve power. Some aerobatics call for it.

The pictures were before I installed the wheel pants. She looks better now with them on.