This Sleek New Zero-Emissions Jet Will Fly on Liquid Hydrogen

Of all the emerging forms of aviation propulsion, hydrogen seems the least likely to be an early adopter. But Swiss-based Sirius has announced plans to start flight tests of a hydrogen-powered business jet in 2025.This 6-Wheel Formula 1 Race Car Remake Is Heading to Auction

The Business Jet will be limited to only three passenger seats. But no emissions and a range of 1,150 miles could make it a contender in the light-jet category.Hydrogen-powered aircraft are rare, but not new. In February 1957, a Martin B-57B flew on hydrogen for 20 minutes on one of its engines, rather than using jet fuel. Just over 50 years later, Boeing flight-tested a two-seat Diamond DA20 on a fuel cell.

The larger Millennium Jet is designed for commercial use, with five seats but about half the range of the Business Jet.Hydrogen has a much higher power density than batteries, giving it a much larger range than pure-electric aircraft. The Business Jet will be able to fly 1,150 miles, thanks to extended fuel tanks. Its designated maximum cruise speed is 323 mph.

According to Sirius, a full-scale working prototype is now under construction, with completion expected in the second or third quarter of this year. Toward the end of 2024, it will undergo initial hovering tests and horizontal flight. In 2025, Sirius expects to manufacture several full-scale airframes and to put those through more extensive flight testing. The development of the electric motors and blades will take place at the same time.

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