同时,电动飞机巡航速度较低,特征尺寸(弦长)小,飞行雷诺数低,因此气动力设计难度大。高空长航时(HALE)飞机飞行环境复杂(密度、温度、高空风等),大翼展机翼的气动弹性问题难解决,气动力设计难度更大。
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高空长航时无人机是其一个重要分支。
High altitude long-endurance UAV is one important branch of it.
本实用新型可改变传动比使飞机模型以不同速度飞行或增长航时。
The utility model has the capability to vary the transmission ratio, causing the airplane model to fly at different speeds or to increase the endurance.
这位人士在肯定其长航时的同时,认为其传感器目前低于平均水平,并“将继续中等偏下”。
The source praised the aircraft’s long endurance, but said the sensors are currently sub-par and “will continue to be well below par.”
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