Stunt models tend to be among the larger control line models, wings usually spanning from around . Top competition models have been traditionally powered by a two-stroke engine in the to 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 , with a single lap of the circle taking around 5.5 seconds.