Word: backward
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Dates: during 1940-1949
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This is mostly because the "propulsive efficiency" of the jets at ordinary speeds is low compared with conventional airplanes. Propeller-driven planes are pushed forward by the reaction from the blast of air forced backward by the prop. When the plane is standing still on the ground with its propeller roaring, all the engine's effort is wasted on merely moving air. None goes into forward motion; the propulsive efficiency is zero. When the plane is in the air, the propulsive efficiency is high. Propellers are designed in such a way that when the plane is flying at full...
...planes are pushed by the reaction of the blast of hot gas shooting out the tail pipe. The present problem is that this blast is speeding much too fast-at about 1,300 m.p.h. Even when the plane is flying at 600 m.p.h., the blast is shooting backward in still air at 700 (1,300 minus 600) m.p.h. The engine is still wasting too much energy merely stirring up the air. To approach the normal propulsive efficiency of a propeller plane, a jet plane would have to fly faster than sound. But one arresting compensation-for the jets-is that...
...While listening to the Democratic convention as continuously as I followed the Republican convention, I observed one striking contrast . . . The Democrats are looking backward on the events of the past, the Republicans are looking forward on the events of the future...
Major General Vasily Stalin, 28, a backward son when a schoolboy, demonstrated last week that he has learned to recite perfectly: "Every participant in the coming aviation parade [which was later rained out and postponed a week] will demonstrate his love and gratitude to the creator and organizer of all victories and successes of the Soviet people, the best friend of Soviet aviators, the wise, brilliant commander and generalissimo of the Soviet Union, Joseph V. Stalin...
...story that is half good fast Western, half a discussion of human liberty. In the same manner, H. L. Mencken ignores most of the who, what & when of the courtroom testimony in the Scopes evolution trial (1925) and tells the why of the trial in the mores of the backward, superstition-ridden hill folks...