萤火虫项目是一种单旋翼直升机，使用美国混合动力(US Hybrid)公司制造的电池。

It's a single rotor helicopter powered by batteries made by US Hybrid.

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针对常规单旋翼带尾桨直升机，讨论不同特性的入流模型在直升机数值仿真中的作用。

For the classical helicopter of single main rotor with tail rotor, the effect of inflow models with different characteristics on helicopter trim and digital simulation were discussed in this paper.

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以常规单旋翼带尾桨直升机为对象，讨论均匀与非均匀入流模型对直升机飞行数值仿真的影响。

For the current helicopter of single main rotor with tail rotor, the effect of inflow models with different characteristics on helicopter trim and digital simulation was discussed.

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