Sparrowhawks tend to fly in a frequently flapping, fluttering type flight. The Wakwak makes a sound by flapping its wings while flying. Its flight is a mix of flapping and gliding. Pilots have little control over blade flapping and flexing, gusty wind, and/or turbulent air conditions. This was an adaptation to withstand the forces caused by flapping the wings. Most included magnets or simple mechanisms, such as flapping wings. They include hand movements such as flapping or twisting, and complex whole-body movements. You see a pot-bellied scarecrow flapping erratically. The second aircraft had flapping outer wing panels. Most thrust is generated on the downstroke of flapping flight. Action origami, first appearing with the traditional Japanese flapping bird, is quite common. They practice by stretching, running, flapping, and making small hops and jumps to get airborne. In flight it alternates between rapid flapping and short glides. Secondly, it adducts the humerus, as when flapping the arms. There were several developing analytical models attempting to approximate flow close to a flapping wing.