一架直升机主要由旋翼、机身、发动机、起落装置和操控系统4大部分组成。按照旋翼的多寡和安装形式区分,直升机机种大致有:单旋翼式、双旋翼式、多旋翼式和共轴式4大类别。 人类对直升机飞行原理的认识,可以追溯到我国东周时期的一种民间玩具——竹蜻蜒,这种翼状物的旋转能产生升力。对直升机来说,升力大于直升机全重时垂直上升,小于直升机全重时垂直下降,等于直升机全重时在空中悬停。利用 A helicopter mainly by the rotor, fuselage, engine, landing gear and control system 4 most of the components. According to the size of the rotor and the installation of the form of distinction, helicopter models are generally: single-rotor, twin-rotor, multi-rotor and coaxial four major categories. Human understanding of the principle of helicopter flight, dating back to China’s Eastern Zhou Dynasty, a folk toy - bamboo dragonfly, this wing rotation can produce lift. For helicopters, the lift is greater than the helicopter full weight vertical rise, less than the full weight of the helicopter vertical decline, equal to the full weight of the helicopter hovering in the air. use