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baggier t1_je7mc6p wrote

Reply to comment by altmorty in This Swiss hypersonic hydrogen-powered jet will cut flights from Europe to Australia to 4 hours by altmorty

The prototype was a large sized drone powered by a conventional aviation fuel powered turbojet at speeds of about 200 km/h. The switch to hydrogen is theoretical, the hyperspeed (let alone supersonic) is just aspirational. And by aspirational I mean

  1. Raise lots of grants and venture capital
  2. Keep lots of scientists, engineers and management paid for many years
  3. Give up in about 10 years and move on to new project
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