https://newatlas.com/aircraft/h2fly-liquid-hydrogen-flight/

H2Fly prepares for pioneering liquid hydrogen flight tests
By Loz Blain
April 05, 2023

German company H2Fly is preparing the world's first flight of a passenger
aircraft powered by liquid hydrogen fuel
German company H2Fly is preparing the world's first flight of a passenger
aircraft powered by liquid hydrogen fuelH2Fly
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H2Fly has successfully tested the ground-based cryogenic fuel filling
procedure that'll power groundbreaking liquid hydrogen aircraft flights in
the coming months. Liquid H2 will be an absolute game-changer, allowing
clean long-distance air travel.
Replacing the rich energy source of Jet-A kerosene with a zero-carbon
alternative is no easy task for the aviation industry. There are
"sustainable aviation fuels" made with captured carbon, but in order to go
zero-emissions, what works for cars and trucks isn't gonna cut it –
batteries are too heavy, hydrogen gas takes up way too much space.
Intercontinental green aviation looks most likely at this point to begin
using liquid hydrogen.

By weight, hydrogen carries some 2.8 times the energy of today's liquid
fuels. But even when you cryogenically cool it into a liquid, it takes up a
lot of physical space – about 3.7 times more than jet fuel. So it's light
but bulky – and some of that weight saving disappears once you start looking
at a full system – after all, hydrogen only stays a liquid if you keep it
below 20 Kelvin (-253 °C /-423.4 °F).

The HY4 aircraft has already taken many pioneering flights running on
gaseous H2
The HY4 aircraft has already taken many pioneering flights running on
gaseous H2H2Fly
Thus, it's a giant pain to work with – which is why, other than some secret
military work in the mid-1900s, the vast majority of new hydrogen aviation
enterprises
https://newatlas.com/tag/hydrogen-aviation/?itm_source=newatlas&itm_medium=article-body
have studied it, bookmarked it and got on with making their planes work on
gaseous hydrogen instead. There's more than enough work to be done proving
the rest of these systems, from fuel cells and storage to electric
propulsion, are certifiably safe and ready for prime time without having to
deal with a cryogenic liquid even Lockheed's Skunkworks couldn't handle.
https://www.bbc.com/future/article/20220316-the-epic-attempts-to-power-planes-with-hydrogen

Stuttgart's H2Fly, though, is ripping right into it. Having already made the
first manned, purely hydrogen-powered flight back in 2009, and more recently
having done pioneering work
https://newatlas.com/aircraft/hydrogen-electric-hy4-passenger-aircraft-sets-altitude-record
with a gaseous hydrogen system built into a twin-fuselage Pipistrel Taurus
G4, the company has now fitted the same HY4 plane with a liquid storage
system from Air Liquide, and is hoping to lead the charge back into the
skies with liquid H2.

Today's announcement covers the successful completion of ground-based fuel
filling tests. The company has already done extended vibration and leaking
testing on the cryogenic tank, which sits alone in the left fuselage, well
isolated from the pilot in the right fuselage.

Ground-based liquid hydrogen refuelling tests are now complete
Ground-based liquid hydrogen refuelling tests are now completeH2Fly
“The successful on-ground filling tests today mark the next milestone in our
pursuit to doubling the range of our HY4 aircraft," says Prof. Dr. Josef
Kallo, co-founder and CEO of H2FLY. "It is a critical step for our upcoming
flight test campaign this summer, which will demonstrate the feasibility of
liquid hydrogen as a fuel for medium and long-haul flight.”

Indeed, if the HY4 takes off this summer as planned, it'll be the world's
first manned flight of a liquid hydrogen-powered passenger aircraft. This is
pioneering work of great consequence to the green transition. We wish these
guys well!

Source: H2Fly https://www.h2fly.de/newsroom

Larry Dighera <LDighera@att.net> wrote:
>
>
> https://newatlas.com/aircraft/h2fly-liquid-hydrogen-flight/

New Hydrogen Research Reminds Us Humanity Just Can't Win With Fuel Alternatives

https://autos.yahoo.com/hydrogen-research-reminds-us-humanity-190000017.html;_ylt=AwrO6HooFi9kC1EA4EfQtDMD;_ylu=Y29sbwNncTEEcG9zAzUEdnRpZAMEc2VjA3Ny

"But new research indicates that hydrogen buildup could have adverse
effects on the climate, not terribly unlike the fuel it’s meant to
replace."

No free lunch...