These insights offer a new roadmap for designing embedded engines that sound quieter, not just measure quieter—a vital step for improving public acceptance of future urban air mobility aircraft.

Boom Supersonic's XB-1 made history on Tuesday by becoming the first civil aircraft to break the sound barrier. Why It Matters. Before Tuesday, no civil private manufacturer had passed the sound ...

When the experimental XB-1 aircraft broke the sound barrier three times during its first supersonic flight on 28 January, it did not produce a sonic boom audible from the ground, according to US ...