The Ultimate is a very versatile plane. It will fly scale aerobatics and it will also do some 3D stuff if you want. Mine weighs about 8 pounds with a Saito 125 and a heavier fiberglass cowl and it flies great and has enough power to hover with a low pitch high thrust prop. But mostly I just fly it around and do standard manuevers. I would think a 75 size two stroke would be fine.