米-17是米-8的深入改进型号，为提高高海拔高温性能，采用了更加强大的发动机，于1975年开始服役。
Mi-17, entered service in 1975, is the highly improved Mi-8, with more powerful engines for 'hot and high' conditions.
通过研制立式直流电力测功机，实现对立轴发动机的动力和经济性能测试，为改进其性能提供科学依据。
By developing the vertical DC dynamometer, the test of power and economic properties of vertical shaft engine is accomplished, which provides scientific basis for improving the performances.
通过结构改进进行低噪声发动机设计，不仅可以在根源上控制发动机噪声，而且可以改善发动机的性能，还不会使发动机结构变得复杂。
Based on the structural improvement, it not only control the engine noise from root, but also can improve the engine performance without adding the complexity to the engine.
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