this post was submitted on 09 Jun 2025
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The issue with aviation hydrogen is... well, lots.
Fuel cells are heavy and direct combustion is inefficient and tougher than burning kerosene.
Aircraft typically use the wing structural members as the fuel tank walls. Both cryogenic and pressurised options make that a non-starter.
Lower density means much bigger tanks.
Self-vapourising fuel is a major crash issue.
Round trip efficiency for H2 is still terrible.
Plants may not be particularly efficient per km^2 but arable land isn't actually that hugely scarce.
Reducing aviation is really the only thing that's actually going to work.
Delta wing designs will harry a lot of H2. It is suitable for LH2. Carbon fibre reinforced wing tanks. Efficiency is not as bad as other storage processes. Exportable/transportable fuel has huge advantages in monetizing surplus renewables.
I don't know about this. Vaporization does create a cooling effect, and having some battery can increase takeoff power and be charged during flight. Venting pressure release is an easy option.