50 years ago, the X-15 flew at Mach 6.7. No aircraft since then has ever gone as fast. But why?pic.twitter.com/68bcHBAfR6
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I just can't think of many domains of tech where progress stalled out for half a century.
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Supersonic flight was too expensive for commercial viability. That may now be changing with new materials. Also, regular sonic-booms over land are extremely disruptive to wild animal life and people.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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