Barnett Rotorcraft was created in 1962.
The antonym for subsonic is supersonic.
Subsonic means "slower than the speed of sound" so a subsonic bullet is any bullet that travels slower than the speed of sound.
Subsonic - media server - was created on 2005-02-10.
Rotorcraft is atechnical word for helicopter.
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Supersonic
Transonic being past the speed of sound and subsonic is below the speed of sound.
subsonic is moving below the speed of sound, supersonic is faster than speed of sound
Subsonic signals are sounds or vibrations that have a frequency lower than that which may be heard by the human ear as a discernable tone. Vibrations lower than 30 Hz (30 cycles per second) are considered subsonic.
Airplane, rotorcraft, glider, balloon.
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