联合国粮农组织说，六架定翼飞机将于本周抵达西非参与该地区已有的四架飞机的作业。
The FAO says six fixed wing aircraft are arriving this week to join four already operating in the region.
直升飞机有一个五浆叶主旋翼和一个四浆叶尾旋翼。
The helicopter has a five-blade main rotor and a four-blade tail rotor.
实验研究方面的内容和成果主要有四个方面：（1）边条翼布局飞机模型双垂尾抖振风洞实验研究。
The wind tunnel experiments include four aspects:1) A wind tunnel investigation of twin-vertical-tails buffet of a strake-wing layout was conducted to study the test method of tail buffet.
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