Control Line Aerobatics is where a model is flown through a sequence of aerobatic manoeuvres which are scored. Usually 3 or 4 rounds flown and the worst round score discarded. It is a world championship event and the world champs are flown every 2 years at different sites. Aerobatic (Stunt) models tend to be among the larger control line models, wings usually spanning from around 45–60 inches (1.1–1.5 m). Top competition models have been traditionally powered by a two-stroke engine in the 0.35 cubic inches (5.7 cm3) to 0.60 cubic inches (9.8 cm3) range, with four-stroke model engines and electric power also becoming popular as power sources. The airplanes, while possessing high thrust-to-weight ratios by full-scale standards (usually at least 1:1), are intended to fly quite slowly to enhance pilot control, typically around 55–60 mph (89–97 km/h), with a single lap of the circle taking around 5.5 seconds.
New Zealand Aerobatic models at the Perth 2026 World Control Line Championships