Translations:KAVAN V20 + ETHOS™ - User manual/393/en

Butterfly or crow braking is used to control the rate of descent of an aircraft. The ailerons are set to go up a modest amount, while the flaps go down a large amount. This combination creates a lot of drag, and is very effective for braking and therefore ideal for controlling the landing approach. The input is normally set to a slider (or the throttle stick on a glider).