Word: barriers
(lookup in dictionary)
(lookup stats)
Dates: during 1960-1969
Sort By: most recent first
(reverse)
EAST German guards, their tommy guns swinging jauntily at their hips, last week pulled a striped red and white barrier across the autobahn checkpoint at Helmstedt on the border between East and West Germany. Two hours later, after cars and trucks had piled up for nearly a mile, the East Germans reopened the road and the traffic flowed once more between West Berlin and West Germany. It was a chilling reminder of West Berlin's vulnerability and a portent of what may come...
Doug Hardin will defend his title in the two-mile against Yale's Frank Shorter and Princeton's Eamon Downey. They are the only other entrants who have broken the nine-minute barrier this season. Hardin has never lost to either of them on the track and holds an important psychological edge. Crimson sophomore Dave Pottetti is a dark horse possibility in this event and should pick up valuable placing points...
Aeronautical Engineer Richard Whitcomb literally changed the shape of modern aviation when he designed the "Coke bottle" fuselage - a narrow-waisted plane body that helps high-speed jets to slip through the sound barrier into supersonic flight. Now, 18 years later, Whitcomb has done it again. He has de veloped a radically new wing that will allow subsonic jets to fly faster, more smoothly and more efficiently...
...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...