The helicopter has a five-blade main rotor and a four-blade tail rotor.
直升飞机有一个五浆叶主旋翼和一个四浆叶尾旋翼。
2
The paper includes four parts: turbulence wind field model, the load of the wind turbine, the load distribution of wind turbine blade, the wind turbine reliability analysis.
论文包括四部分：紊流风场模型、风力机载荷分析、风力机叶片载荷分布、风力机叶片可靠性分析。
3
Adding a rotor blade (it had five on the main rotor and four on the tail) and using a modified exhaust system were among them.