Easyjet and Rolls Royce test hydrogen jet engine

That is awesome – except that – they attack the wrong problem. I never doubted that it will be possible to convert engines from Jetfuel to hydrogen. But how do you store enough hydrogen on an airplane? And where? Wing tanks don’t work because for better density you need it as a cryoliquid and they need insulated cylindrical tanks. Not something you can or want to put into wings. So it’s part of your payload bearing room that will go away for that. Plus, energy per volume unit is really bad so tanks need to be very large. Oh and, hydrogen is still pretty nasty as a molecule (hydrogen embrittlement, diffundation, easy explosivity, …) – the engine is the last thing on my big bad problems list when it comes to H2 airliners. 

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