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The X-51A dropped from the wing of an Edwards Air Force Base B-52 Strato Fortress over Point Mugu Sea Range in California and sped off, reaching just under Mach 5 during the first part of its [...]

Does the SR72 actually exist? Is it practical or even possible? Lockheed Martin says they can produce a demonstrator by 2018, and they’ve been working on it since 2013. But many don’t [...]