A new airplane silently broke the sound barrier. It looks nothing like NASA's X-59
Briefly

Boom Supersonic achieved a historic milestone by breaking the sound barrier three times on its XB-1 demonstrator aircraft without producing a sonic boom. This achievement, recorded by NASA, was made possible through the innovative use of Mach cutoff and advanced computational techniques. CEO Blake Scholl stated their predictions were accurate as the flights did not create the expected disruptive noise. This challenge in supersonic travel has historically hindered commercial viability, but Boom's approach, diverging from traditional aerodynamic designs, might pave the way for quieter supersonic flights in the future.
"On our first flight, we expected to break the sound barrier without a sonic boom—that was our prediction. We broke the sound barrier three times... no boom."
"Rather than redesigning the physical airframe of the airplane to redirect air... the company bet on taking advantage of using a physical phenomenon called Mach cutoff."
Read at Fast Company
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