Word: sonics
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Dates: during 1960-1969
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Although a sonic boom can shatter windows miles below a jet, the Anglo-French partners maintain that tests have shown that their Concorde will not cause "danger to life, health or property." Even so, during the first two test hops last week, the roar of the plane's engines could be heard miles away. If its flights have to be rerouted to avoid populous areas or its engines throttled back to lower noise levels, Concorde's already precarious ability to fly the Atlantic will dwindle dangerously, and its attraction to airlines that travel mostly over land will...
...checkbook, and waited patiently while a new clerk figured out how to work the still camera that photographed every customer paying by check. In her confusion, the clerk wrapped the package without first removing the tags. One of them was a wafer, specially radiated to set off a Knogo sonic alarm in the doorway of the store. John had barely reached the sidewalk when he was surrounded by detectives who accused him of shoplifting...
...speed of sound, a bell rings and a light flash es to caution him to go no faster. There is good reason for the warning. Beyond that limit, the big ships generate turbulence that causes a drastic loss in efficiency and sometimes dangerous buf feting. Thus, although the sonic barrier is around 660 m.p.h. at the normal jet cruising altitude of 35,000 ft., commercial jets are held down to a speed of about 560 m.p.h...
...source of the trouble was the upper surface of the conventional wing, which has a convex curve to provide lift.* When the plane reaches about 80% of the speed of sound, however, the velocity of the air flowing over the upper side of the wing reaches the sonic barrier. A shock wave forms about half way back from the wing's leading edge, disturbing the airflow and increasing drag-the resistance of air to the plane's passage...
Reduced Drag. Wind-tunnel data revealed that when the airflow reached sonic and supersonic velocities along the redesigned upper surface, only a modest shock wave was generated near the trailing edge of the wing. There was negligible turbulence. Although the changes did not affect lift, drag was reduced by as much...