Know about SR-72 spy plane that can traverse a continent in less than an hour
Know about SR-72 spy plane that can traverse a continent in less than an hour
New Delhi: SR-72 blackbird is a spy plane that can cross a continent in less than an hour.The unmanned, hypersonic aircraft is being designed by American aerospace company Lockheed Martin.With a mach speed of 6,
India TV News DeskPublished : Apr 02, 2014 22:52 IST, Updated : Oct 27, 2014 10:05 IST
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However, in 1998 it was retired due to high maintenance costs.
