The HY4 has already set a record for highest zero-emissions flight, but its new liquid hydrogen-powered fuel cell could be a game-changer.
But actually building an aircraft that can handle those tanks has proven to be a technical challenge. One German company is pushing ahead. H2Fly has been flying a four-seat aircraft called the HY4 on a fuel cell powered by hydrogen gas since 2016. In April, the aircraft set a record for the highest zero emission flight, at 7,230 feet.
H2Fly announced recently that it would be installing tanks that can handle liquid hydrogen. The switch from pressurized gas should at least double the odd-looking twin-prop’s range, from 450 to 900 miles.“Liquid hydrogen has huge advantages over the alternative pressurized hydrogen gas, not least because it becomes possible to carry a far greater quantity on board an aircraft,” Dr.
Kallo wouldn’t share performance projections, but it’s a safe bet the new system will improve on the current version of the HY4, which has a maximum speed of 125 mph with a 90-mph cruise. Those numbers are possible thanks to an efficient twin-fuselage design that provides optimal spacing of the propellers and electric motors, which are powered by the cells and a small battery bank that offers additional power during peak loads.
The HY4 filling up with hydrogen gas. The new aircraft will have an extra tank for storing the liquid hydrogen. “If we really want to change energy use on a global scale, we have to go with the fuel that provides the most efficient way of creating power, and that is definitely hydrogen,” Kallo said. “No other process comes close.”
The company has entered into a partnership with Deutsche Aircraft to develop a fuel-cell powered aircraft that will hold up to 40 passengers, with a range of 1,200 miles. Like the HY4, it will tap into liquid hydrogen.ZeroAvia is also developing a hydrogen-powered commercial aircraft. Tests could begin next year. concepts that it says will go into commercial service by 2035. Cranfield Aerospace Solutions announced that its Project Fresson was switching from batteries to hydrogen gas power.
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