Abstract In the previous chapters, we saw the flight of airplanes and gliders requires that a downwash must be created by the fixed wing as it moves through the air. The aerodynamic lift thus created depends crucially upon the speed relative to the atmosphere (airspeed), as well as on the incidence angle (angle-of-attack) made by the flight direction with the chord of the wing. As the speed falls below a certain level (called stall speed), the lift is insufficient to support the weight of the vehicle at even the largest possible angle-of-attack, and a stall results. Therefore, the fixed-wing flight requires a certain minimum forward flight velocity called the stalling speed. This severe limitation of airplanes and gliders is removed by having either a flapping wing or a rotary wing, which can generate the lift by the motion of a wing relative to the vehicle. In this manner, the vehicle can either ascend of descend vertically, or even remain stationary in the air (hover) like a hummingbird. In other words, while an airplane gently coaxes the air to follow the contours of its fixed wings, a flapping vehicle and a helicopter beat the air into submission with their moving wings.
Flapping and Rotary Wing Flight
Basic Flight Mechanics ; 87-98
01.01.2016
12 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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