Word: long
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Dates: during 1940-1949
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...escape into outer space, Lewis pointed out, requires an initial speed of 6.95 miles a second (25,020 m.p.h.). This requirement cannot be dodged by running the rocket motor slowly over a long period; that would only waste energy by forcing the ship to carry heavy fuel to a greater height...
...first of two artificial gaits, a kind of running walk. Southern plantation owners, who used to spend long hours in the saddle overseeing their property, used it because while it covered ground it was easy on the rider. A horse's three conventional speeds forward-the walk, trot and canter-were either too slow, too fast or too uncomfortable for some early American connoisseurs...
...Tsien's rocket liner would be 78.9 ft. long and 8.86 ft. in diameter, with a loaded weight of 96,500 Ibs. It would have small wings and a ramjet as well as a rocket motor. Its maximum speed, 9,140 m.p.h., would carry the ship 1,200 miles on an elliptical course outside the atmosphere. As it curved down toward the earth, it would meet the air again and turn into a non-powered glider. Coasting through the air for another 1,800 miles, it would land at 150 m.p.h.-not much more than the landing speed...
...breeders, or converters, will lessen the waste, presumably by causing more neutrons to be absorbed byU-238. If the amount of plutonium or other nuclear fuel thus produced is larger than the U-235 consumed, the pile could continue in operation for a very long time. First the original U-235 would be consumed, yielding energy and plutonium made out of 11-238. Then some of the plutonium would fission, yielding energy and creating more atomic fuel. Theoretically, the process might continue until all the 11-238 is consumed. Natural uranium could yield something like 140 times as much energy...
...Ashes. The AEC does not claim immediate 100% efficiency. The accumulation of radioactive fission products as impurities in the uranium, for instance, will certainly cause trouble long before the action is complete. But the contaminated uranium could be purified and "recycled." The AEC did not say so, but there is a possibility that when the breeding process has been refined, the uranium can be run through the reactor again & again until essentially all of it has been turned into energy. The world might thus have a practically inexhaustible source of nuclear fuel...