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直升机是一种非常年轻的飞行器,到现在才只有60多年的历史。直升机又是十分灵活、用途极广的飞行器,同一般飞机相比,它有许多优点。例如,它能垂直起飞和降落,不依赖机场;它能在空中悬停(停在空中不动);能侧飞、后飞和倒飞,还能贴地飞行。一般飞机不能到达的地方,直升机都能够去。我国是从50年代开始创建直升机工业的,到现在为止共研制过9个直升机型号,但真正投产的只有4个
Helicopter is a very young aircraft and it has only been 60 years old. Helicopters are also very flexible and extremely versatile vehicles. Compared with other aircraft, they have many advantages. For example, it can take off and land vertically and does not rely on the airport; it can hover in the air (stop in the air); can fly sideways, fly backwards, and fly backwards, and can stick to the ground. Helicopters can go where the general plane cannot reach. Our country started the helicopter industry from the 1950s. Up till now, a total of 9 helicopter models have been developed, but only 4 are actually put into operation.