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波音端出自家的极音速概念飞机
source link: https://cn.engadget.com/2018/01/16/boeing-shows-hypersonic-spy-aircraft-demonstrator/
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自从世界知名的 SR-71「黑鸟」侦察机于 1998 年退役后，坊间就一直有传闻说美国正在祕密开发它的后继机种。原先黑鸟的 3.3 倍音速依旧是目前载人喷射机的纪录保持者（当然火箭更快），而下一阶段美国空军希望采购一架可达到「极音速」领域，速度达 5 倍音速以上的飞机。除了外型和材料之外，事实上打造这么一架飞机最大...
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