Word: thrustingly
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...gravity of other planets represents a still-untapped source of energy for long-range space flights. Jupiter's gravity, for example, would exert a tremendous pull on a passing spacecraft, accelerating it greatly and deflecting its course. Thus Jovian gravity could be used, in effect, to gain both thrust and a mid-course correction without the expenditure of fuel. Space scientists, like expert billiard players, can precisely determine the amount of acceleration and degree of deflection by careful control of both the velocity and course of the spacecraft as it approaches Jupiter...
While the use of the interplanetary billiard technique drastically cuts travel time, Stewart says, it does little to reduce the large amounts of fuel and great initial thrust required to send a spacecraft to the distant planets. But another rapidly developing propulsion system, the solar-powered ion engine, may well solve that problem in time for the flights of the 1970s. Using electricity generated by solar panels, these engines produce a stream of ions (charged atomic particles) that provide a minute amount of thrust - usually measured in hundredths of a pound...
...great societies at home and grand designs abroad. In the next five years, he observes, the number of U.S. families will grow by 5,000,000, or 10%, providing a tremendous expansive force and placing many new demands upon the nation's banks and businesses. "The next big thrust in the economy," he says, "will come from urban development - new concepts of housing, transportation, pollution control. All these things are sitting on the shelf, ready to go, and when the war in Viet Nam ends, domestic development will move fast." America's economy need never run down, because...
...They then blended their repulsive mixture with powdered metal and a solid oxidizer, producing a black, slimy, globlike but surprisingly odorless substance that was dignified with the name MONEX W. Ground-tested in a rocket engine, it ignited quickly, burned smoothly with a bright orange flame, and produced ample thrust. The successful demonstration has just won Rocket Research a NASA feasibility contract to determine if MONEX W can be used on manned space flights...
Though the thrust supplied by the new fuel is lower than the performance of conventional liquid propellants, it has some distinct advantages. It does away with the necessity of disposing of its major ingredient in space, and scientists calculate that because a MONEX W rocket will manufacture part of its fuel in flight, it will actually have less lift-off weight than a conventionally fueled rocket designed for the same long-range mission...