Dressed warmly, an unnamed NACA test pilot in 1928 gets ready for a high-altitude flight from the group's Langley Memorial Aeronautical Laboratory airfield in Virginia.

穿着热烈，于1928年1无名的NACA试飞员得到准备从该集团的兰利航空实验室在纪念弗吉尼亚机场高空飞行。

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The flight test was conducted in the challenging high altitude environment required for refueling of high altitude long endurance (HALE) unmanned aircraft systems (UAS).

这次飞行测试是在充满挑战的高空环境下进行的，这也是高空长航(HALE)无人机(uas)加油所需的环境。

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It's the basic physics that the air is thinner and the resistance to any projectile is less so the flight path of the ball will be different at high altitude.

基本物理学理论上，空气越稀薄情况下，任何物体的耐性都会减少，因此球路也会因海拔高度不同而有所变化。

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Pilots should be trained on how to handle this event and a high-altitude stall with better technical instruction and flight simulator programs, the report said.

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