[excelpoint]

There are no size/engine limits in any classes(except what your national body says). The only difference in the classes is basic where you can fly anything at all. Once you get above basic you will need to have a Scale aerobatic plane. In Sportsman and above the plane must be of a type that flys in IAC competition or was designed or capable of being flown in an aerobatic box(or words to that effect)