There is a helicopter pad right in front of the side of the Pentagon. The wing touched there, then the plane cartwheeled into the building.
五角大楼侧面有一个直升机停机坪，机翼碰到停机坪上，旋即侧滚进五角大楼的建筑中。
Hummingbirds are well known for their wing speed and ability to hover and fly forward and backward with more precision than a helicopter.
众所周知，蜂鸟的翅膀拍打速度极快，它即可以凌空悬停，也可以快速向前飞行和向后飞行，其飞行的精准度甚至超过了直升机。
Due to the lower flight height and the slower flight speed of helicopter, Compared with the fixed wing airplane, the visual system of helicopter flight simulator has the particularity in visual scene.
由于直升机飞行高度低、飞行速度较慢，直升机飞行模拟器的视景系统具有特殊性。
This paper analyzed the radar recognition ability of two kinds of air targets, i. e. helicopter and fixed-wing aircraft.
分析了雷达对直升机和固定翼飞机这两类空中目标的识别能力。
The wing structure of the toy helicopter better solves the problem of stable flying of the toy helicopter.
本玩具直升飞机机翼结构较好的解决了玩具 直升飞机平稳飞行问题。
US Army New Training Helicopter(NTH)is a non-developmental item commercial helicopter which is to replace Bell UH-1H as an initial en- try rotary wing and primary instrument trainer.
美国陆军新型教练直升机是一个非新研项目的批量生产直升机，用以取代初级训练及仪表飞行训练用的贝尔UH-1H。
That's right, the designers of helicopter be at studied dragonfly again and again of wing after, pass by to improve continuously function of making the helicopter to just attain perfect result.
没错，直升飞机的设计师们就是在反复研究了蜻蜓的翅膀后，经过不断改进才使直升飞机的性能到达完善成果的。
The problem of classifying the helicopter and the fixed-wing aircraft basing on the low resolution radar signal is studied in this paper.
文中研究了基于低分辨率雷达的固定翼飞机和直升机的分类问题。
The problem of classifying the helicopter and the fixed-wing aircraft basing on the low resolution radar signal is studied in this paper.
文中研究了基于低分辨率雷达的固定翼飞机和直升机的分类问题。
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