The heavy fan motor is mounted on the panel, so have a helper hold it while you install the air conditioner sound blanket. The blankets are safe to use, and they can reduce noise coming from the ...

The XB-1 reached Mach 1.122 when it broke the sound barrier for the first time after about 12 minutes into the flight. ... Tuesday's test flight took place from the Mojave Air & Space Port.

A newly released image shows the sound barrier being broken on February 10 as Boom Supersonic’s XB-1, America’s first civil supersonic jet, completed its second supersonic flight.