What Is the Boom XB-1? Civil Jet Makes History by Breaking Sound Barrier
Boom Supersonic's XB-1 made history on Tuesday by becoming the first civil aircraft to break the sound barrier. Before ...
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Boom Supersonic's XB-1 prototype jet breaks sound barrier for first time
Image: The XB-1 demonstrator aircraft. Pic: Boom Supersonic During the test flight, it reached an altitude of 35,000ft before accelerating to Mach 1.1 (844mph) - 10% faster than the speed of sound.