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1、第二章 民用航空器,第一节 分类与发展,航空器的定义,Aircraft Any machine that can derive support in the atmosphere from the reactions of the air other than the reactions of the air against the earths surface. Aeroplane A power-driven heavier-than-air aircraft, deriving its lift in flight chiefly from aerodynamic reactions o
2、n surfaces which remain fixed under given conditions of flight. Helicopter. A heavier-than-air aircraft supported in flight chiefly by the reactions of the air on one or more power-driven rotors on substantially vertical axes.,Balloons,Balloons are used in weather forecasting, science, and sports,An airship is a lighter-than-air vehicle that is steerable and powered.,Airships,Gliders,Kites,Planes,Helicopters,Rotorcraft,Ornithopers,民航机的分类（1）,用途 商用 通用,发动机 活塞 喷气,机体 宽体（双通道） 窄体（单通道）,航线 干线（100 seats） 支线（100 seats）,民航机的分类（2）,航程 短程 5000 km 远程 8000 km,民航机的要求,快速 经济 舒适 环保,