这就是为什么飞机要在低平流层飞行的原因。
两架飞机之间的尾流以及在平流层飞行时的发动机性能和飞行控制响应都进行了评估。
Wake turbulence between the two aircraft as well as engine performance and flight control responsiveness in the stratosphere were evaluated.
这些就是目前的原理，迄今为止，除了一些在低海拔的飞行测试，唯一的平流层测试是涉及一个按比例缩小拴在气象气球上的模型。
That is the theory, at least. So far, apart from some low-altitude test flights, the only stratospheric tests have involved a scaled-down version tethered to a weather balloon.
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