最近，美国波音公司研制出一种称为“卡纳德”转子机翼的飞机，既可垂直起落又能像一般有固定机翼的飞机一样高速飞行。这种飞机利用一个双叶片转子，起飞时,它像直升机的旋翼一样，保证飞机从地面垂直起飞，升空后，叶片就锁定在固定位置，起固定机翼的作用。这样，飞机就能获 Recently, Boeing of the United States has developed an aircraft called the “Kanad” rotor wing that can fly vertically and fly at the same high speed as an airplane with a fixed wing. This type of aircraft utilizes a two-bladed rotor. When taking off, it is like a rotor of a helicopter. It ensures that the aircraft takes off vertically from the ground. After being lifted, the blades are locked in a fixed position and function as a fixed wing. In this way, the aircraft can gain