Word: wingspan
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Dates: during 1990-1999
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...solution, in retrospect, was simple. "If you start with a hang-glider- size plane and triple its size up to a 90-ft. wingspan while keeping its weight the same," MacCready explains, "the power needed to fly it goes down by a factor of three" -- to only about 0.4 horsepower, in fact, which a trained cyclist can generate for many minutes at a time...