Supersonic 990mph Nasa X plane as quiet as ‘thump of car door’ is nearly ready
over 4 years in The sun
AN EXPERIMENTAL Nasa X-plane that soars “quietly” at supersonic speeds is on track to be built before the end of the year. The stealthy jet’s sonic boom is expected to sound no louder than the thump of a car door closing at ground level. Nasa greenlit the project to be built by Lockheed Martin just […]
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