Word: low
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Dates: during 1940-1949
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...Crump don't 'low no easy riders here...
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...
...wake. The air ducts grumble below the floor; a ventilator hisses. When the plane is up to speed, the airstream rushing over the canopy makes a moderate, roar. There is hardly any vibration. Experienced pilots say that the plane handles "like a kiddie-car." When it makes a "low pass," flying close to the ground at 550 m.p.h., objects far ahead seem to vanish before the eye has time to take a second look...
...scientists of the NACA are digging out deep-hidden facts about high-speed flight. They put experimental wingshapes in big & little wind tunnels, and test their behavior far above Mach i. They test engines and engine components in wind tunnels too, to see how they behave at great speed, low pressure, low temperature. They devise new, more powerful fuels and high-temperature alloys...
...jets develop some power at low subsonic speeds, but they are efficient only above Mach i. For speeds even higher, it is possible to design a 20-inch-diameter ramjet that will develop (theoretically) as much as 30,000 h.p. They use a corresponding amount of fuel. Northrop's turbine expert Tom Quayle calls the ramjet "the hungry speed animal...