The idea of hydrogen-powered aircraft has been in the minds of professionals for decades. Back in the 1950s, the US Air Force flew B-57 aircraft with hydrogen fuel, and in the 1980s, Tupolev converted a Tu-155 aircraft to a hydrogen gas turbine. While now the focus shifts to hydrogen because of ecological concerns, at the time Tupolev's reasoning was more economical - relatively inexpensively fuel production using nuclear power made hydrogen an attractive alternative.
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