Word: sonically
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...PAIR of loud sonic booms shook the sky over the Atlantic Ocean last week, heralding the approach of Apollo 9 as it hurtled through the thickening atmosphere on its way home. Then, to the cheers of sailors on the deck of the helicopter carrier Guadalcanal, the heat-charred spacecraft floated down through the cloud cover and splashed into the water only three miles away. The triumphant ending to the ten-day, near-perfect mission of Apollo 9 cleared the way for the final U.S. thrust toward a manned landing on the moon...
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...
...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...