Joesf
2020-07-07T15:21:14+00:00
美国波音公司和西科斯基飞机公司(Sikorsky)周五发布的联合公告称， “无畏”(Defiant)直升机完成了首次测试飞行。据称，这款直升机的飞行速度可达现有同类产品的两倍的(400公里/时)，但同时还保留了传统直升机优异的低速和悬停性能，是一款接近“完美”的直升机。该型直升机是美国陆军未来“垂直升力”计划的一部分，将作于为美国陆军和美国海军陆战队开发下一代突击和运输直升机的平台。
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