Word: 5a
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Dates: during 1964-1964
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...LIFT FAN: Perhaps the most imaginative design of all is the XV-5A lift fan built by Ryan Aeronautical Co. and General Electric. At first glance, it looks like an ordinary jet fighter with two engines, but set into the stubby wings are what seem to be large manhole covers. When opened, each cover exposes a fan 5 ft. in diameter. When valves close off the tailpipe of the jet engines, racing exhaust gases hit the tips of the fan blades and spin them at high speed. Twin blasts of air are forced downward, and their powerful thrust lifts...