Two pilots fly in the same circle. Their airplanes chase each other's and try to cut a streamer. Each cut gets 100 points. Time spent on the ground will reduce the score. This makes for hot fights !
Pilots must have super fast reflexes. Must be able to control their airplane without looking at it while watching the opponent's model. Two models are allowed per bout, and more often than not they are needed. Flyers bring dozens of models to a contest. They never bring back all of them.
Models have simple, fast, and functional design because crashes are the norm and not the exception. Robust racing glow engines with 2,5 ccm capacity are fed from pressurized fuel system.