Hydrogen-powered planes are, essentially, nothing new. The USSR flew the alternative fuel testbed Tupolev Tu-155 on hydrogen (and liquid natural gas) more than 35 years ago. However, challenges associated with the technology meant that it was basically moth-balled for commercial aircraft operations (rocket fuel is another matter) — until now. With the future of the planet in peril, almost everyone in air transport wants to talk about hydrogen propulsion. From startups to multinational original equipment manufacturers (OEMs), much of the industry is adamant that hydrogen can make zero-emission flights a reality. It is just a matter of actually building the…
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