ABSTRACT
Currently, there are over 300,000 general airplanes around the world, accounting for more than 90% of the civil aircraft. General airplanes are the type with the largest number and the most models among all airplane types. And small general helicopters have become a force in navigation application due to their relatively simple system, low price, and simple requirements for workplace. With the rapid development of general aviation in China, general airplanes, because of the outstanding features, will have broad prospects of their application and development in all departments of national economy [1]. Therefore, homemade general helicopters have been under hot research with excellent achievements, making them an important part of the general aviation market in China.
