飞机在飞行轨迹的最高点，是什么时候，此时距离出发点，也就是关闭引擎的时刻，高度相差多少？，什么时候开始自由落体？
When is the plane at its highest point of its trajectory and how high is it above the point where it started when it turned the engines off when it went into free fall?
然而，通过自由落体测试，研究者可以量化的测量翅果的飞行动力并且用得到的信息数据来控制翅果的自旋和飞行轨迹。
However, through free-fall testing, the researchers could quantitatively measure the samara's flight dynamics and use this information to control the samara's autorotation and flight path.
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