The Synergy N 9 tail rotor system is ready for hard 3 D.

协同N9号尾桨打制三维准备.

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Last beam rear there are two all - metal tail rotor blades.

尾梁后部有两个桨叶的全金属尾桨.

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Natural frequency of culvert tail rotor of some kind of helicopter with uncertain composites was studied.

研究具有不确定复合材料参数的某型直升机涵道尾桨的固有频率.

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For a conventional helicopter, the tail rotor is one of primary sources for helicopter noise.

尾桨是直升机的主要噪声源, 降低尾桨噪声对控制直升机的噪声水平具有重要意义.

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