Search for “Bernard van Dijk” on LinkedIn. He is a professor on an Aviation University. He has a very solid story about why hydrogen will never work in airplanes.
I’m addition, a well explained video about it:
https://youtu.be/nrCE9duCej0
The point seems to be (watch the video) that the fuel is currently stored in wings of aircraft, which in layman's terms means the wings bend up carrying the weight of the fuselage, but the weight of the fuel is in the wings meaning fuel weight does not contribute to wing bend
Current hydrogen fuel power trains put the hydrogen into the fuselage in big tanks. This means the fuel weight now does count to wing bending and so fundamentally you can either take off without passengers or you can have your wings snap.
The answer seems to be put the hydrogen fuel in the wings. I could not find the argument against that. I suspect there is a lot more in the weeds in the industry
This is impractical with current technology. The insulation for liquid hydrogen in wings would be impractically thick and heavy. The structure for pressure vessels for gas in wings would also be impractical.
This argument makes no sense to me.
Even in the 747 and A380, the majority of fuel is stored near the wing roots, so the whole idea reads like a non sequitur to me.
Hydrogen planes are now an engineering and logistics challenge. The science is ancient history.
There is still a lot of market in the size of things like the Q400 flown by Alaska Air. Like a Seattle to Montana flight.