The other type of aerobatic competition is IMAC. This requires planes that are scale models of actual full scale aerobatic planes. A dummy pilot in the cockpit is required by the rules and there is no size limit other than the AMA 50 pound limit for giant scale airplanes. Most pattern planes can not be used in IMAC competition because they are not scale models of full scale aircraft and most IMAC planes are over the pattern 11 pound weight limit.
IMAC planes don't have to be big to be elegable but good luck winning with a .40 size Extra 300.