What is IMAC?
Scale aerobatics is aerobatic operation of a radio controlled scale model of full-sized aerobatic competition plane. While other disciplines within the radio control community fly aerobatics, the requirement for scale aerobatic is that the model be replicas of types known to have competed in International Aerobatic Club (IAC) competition. A wide choice of competitive planes are available to today’s model in both kit and ready-to-fly versions.
The International Miniature Aerobatic Club (IMAC) has grown to represent and organize scale aerobatic competition on a global level. IMAC is a non-profit organization focusing on pilot education and maintenance of rules and guidelines governing the sport. Pilots interested in scale aerobatic competition are encouraged to join and support the organization’s mission.
Please read the followings: http://www.mini-iac.org/Information/About-Scale-Aerobatics