hypersonic
Adjective
Meaning
(of a speed, aviation) Equal to, or greater than, or capable of achieving, five times the speed of sound.
(of a speed, aeronautics) Far enough above the speed of sound as to cause significant differences in behaviour due to chemical reactions or dissociation of the air.
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A fourth classification, hypersonic flow, refers to flows where the flow speed is much greater than the speed of sound.
Already, the forces of Russia, China, and Iran are conducting joint naval drills, Russian and American forces have already brawled with each other in Syria, and Russia has announced a key breakthrough in hypersonic weapons technology.
Aerodynamicists disagree on the precise definition of hypersonic flow.
Air-breathing designs typically fly at supersonic or hypersonic speeds, and usually include a rocket engine for the final burn for orbit.
Clearly Boeing is betting big on hypersonic P2P and they're in a better position to capitalize on it with significantly fewer risks of reaching that point.
But it is still a Cold War subsonic cruise missile that seems a bit of a dinosaur when compared to the supersonic and hypersonic weapons that are being developed today.