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Mysterious rumbling along coast wasn't earthquake, experts say
reply to post by Sremmos80
Sonic boom would make sense, but as the article states, only military aircraft would exceed the speed of sound. Military aircraft do not fly supersonic in civilian airspace (Orange County) however.edit on 9-4-2014 by Wookiep because: (no reason given)
My guess would be it's an X-37B coming in for a landing:
Best guess yet and totally possible but they would be 2 weeks early by there estimations.
Northrop says a "mannable" subsonic design could meet LRS requirements, while Lockheed favours supersonic and unmanned (Below)
Overcoming this sonic boom prohibition has kept engineers busy at the four NASA centers that conduct aeronautics research in California, Ohio and Virginia.
This rendering shows The Boeing Company's future supersonic advanced concept featuring two engines above the fuselage: NASA/Boeing, Since the maximum acceptable loudness of a sonic boom is not specifically defined under the current FAA regulation,
NASA and its aviation partners have been researching ways to identify a loudness level that is acceptable to both the FAA and the public, and to reduce the noise created by supersonic aircraft. Using cutting-edge testing that builds on previous supersonic research
NASA has been exploring “low-boom” aircraft designs, and other strategies that show promise for reducing sonic boom levels. Previous research by NASA, the military and the aircraft industry has determined that a variety of factors, from the shape and position of aircraft components to the propulsion system's characteristics, determine the make-up of a supersonic aircraft's sonic boom. Therefore, engineers are able to tune or “shape” a boom signature through design to minimize the loudness of the boom it produces in flight.
The most recent possible supersonic aircraft designs reflect what's needed to meet NASA's low-boom requirements. These requirements specify targets for boom loudness, aerodynamic efficiency, and airport noise for an N+2 —second generation beyond current technology — aircraft design that could be flying by the years 2020 through 2025.