H2Jet based in Sweden is developing hydrogen combustion engines for mid-range aircraft that might be operational in 2035. The other, larger partnership, H2Gear, is based in the UK and focusing on fuel cells for smaller subregional aircraft, which might be flying in the early 2030s. The hydrogen would be stored cryogenically as an ultra-cold liquid below -253C, rather than the high-pressure gas favoured for terrestrial applications.
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