'World first' | German aviators fly liquid hydrogen-powered plane for three hours
Using liquid hydrogen instead of gaseous H2 will ‘double the maximum range of demonstration aircraft to 1,500km’
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Stuttgart-based H2Fly carried out the campaigns from Maribor in Slovenia, using its piloted HY4 demonstrator aircraft, which had been fitted with storage for cryogenic liquid hydrogen as well as the fuel-cell system — which powered the plane for the duration of the flights.
One of the flights lasted more than three hours, H2Fly reported, significantly longer than the tests carried out by hydrogen aircraft developers ZeroAvia and Universal Hydrogen — of 23 and 15 minutes respectively — earlier this year.
Both the UK’s ZeroAvia and US-based Universal Hydrogen are testing larger, retrofitted passenger aeroplanes rather than demonstration craft and have only completed test flights with one of their planes’ two engines running on fossil fuel.
H2Fly’s flight test results found that the use of liquid hydrogen rather than gaseous would double the HY4 aircraft’s range from 750km to 1,500km.
“This achievement marks a watershed moment in the use of hydrogen to power aircraft," said Professor Josef Kallo, co-founder of H2Fly. “Together with our partners, we have demonstrated the viability of liquid hydrogen to support medium and long-range emissions-free flight.”
“We are now looking ahead to scaling up our technology for regional aircraft and other applications, beginning the critical mission of decarbonising commercial aviation.”
Liquid hydrogen requires much less space than gaseous hydrogen.
ZeroAvia, which uses gaseous hydrogen in its fuel cell propulsion systems currently being tested on a six-seater and a 19-seater aircraft, said it has plans to use liquid hydrogen in its larger models.
Universal Hydrogen has flown a 40-seater aircraft using its fuel-cell propulsion system, but also used gaseous hydrogen for the test flight. The company is planning to convert the plane to use liquid hydrogen later this year.
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