There are many types of drones , which are based on the evolution of many existing aircraft. Now the coaxial twin-rotor helicopter has matured in the world, but in the aviation field of China, it is difficult to machine parts due to its operating mechanism. Big, so there is no widespread application in China. Because the machine has good stability, simple operation, no long tail and tail rotor, tail rotor failure caused the crash can be avoided, it is one of many R & D direction, but also used in UAV technology challenges .
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