So, Blackbird was not hypersonic as its anticipated successor, the SR-72, is set to be. Instead, it was a supersonic plane. But that was fine for the era it was serving in.
National Interest on MSN4mon
JA-37 Viggen: The Fighter That Could Have Shot Down an SR-71 BlackbirdWhat You Need to Know: The legendary SR-71 Blackbird, capable of reaching Mach 3.0, set speed records and flew high-risk ...
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