New US Jet Breaks Sound Barrier in First Flight Test — VOA Learning English
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An experimental aircraft developed by a private American company broke the sound barrier during a recent flight test.
California-based company Boom Supersonic built the plane, named XB-1. The company said the aircraft reached a speed of Mach 1.05 during a test on January 28. The test flight operated from the Mojave Air & Space Port in Mojave, California.
Any speed greater than Mach 1.0 breaks the sound barrier and is considered supersonic. The American space agency NASA explains that at sea level, the speed of sound is estimated to be about 1,236 kilometers per hour.
In a statement, Boom Supersonic said the XB-1 demonstrator aircraft climbed to more than 35,000 feet before reaching Mach 1.0.…
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