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Loren Booda
Apr4-03, 05:57 PM
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A jet stream of 500 MPH enclosing a commercial airliner with local airspeed 500 MPH in the same direction appears from the ground to be going 1000 MPH, yet without sonic boom. A gradual velocity gradient of air therefore does not conduct sound as well as static air. What is the minimum air velocity gradient needed to negate the effect of such relative supersonic speed?