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New acrylic sound barriers on I-81 raise cleanliness and graffiti concerns
On your drive along I-81, you have probably seen the new sound barriers. Many are concrete, but others in the Mattydale area are transparent and acrylic. The Department of Transportation says ...
New Atlas8d
First private-built supersonic plane smashes sound barrier
Boom Supersonic has gone, well, supersonic, its XB-1 prototype breaking the sound barrier today in the skies over the Mojave Air & Space Port in California. With Chief Test Pilot Tristan Brandenburg ...
The Verge8d
Boom’s supersonic test plane breaks the sound barrier for the first time
On its 12th test flight, the Boom XB-1 prototype broke the sound barrier three times and achieved a top speed of Mach 1.1. On its 12th test flight, the Boom XB-1 prototype broke the sound barrier ...
Newsweek8d
What Is the Boom XB-1? Civil Jet Makes History by Breaking Sound Barrier
During the XB-1's historic flight on Tuesday—its 12th test flight overall—the aircraft stayed supersonic for around four minutes before breaking the sound barrier two more times during the ...