Oooooo... I saw a guy crow the other day at the flying field. I couldn't tell you exactly what it is, but it looked really strange when he had to use it while landing. I think it opened both the aileron and flaps at the same time and killed/neutralized the lift that the aircraft was receiving because of a huge head wind at the time. After the landing he showed me what crow looked like on the aircraft, but I didn't quite understand what it was actually used for...