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Feb 4, 2019 at 10:53 comment added Therac @PeterMortensen True, I was addressing volumetric density. As for gravimetric, you'd have to compare entire systems complete with storage, insulation, and extra fuselage volume to get a practical estimate of the effects.
Feb 4, 2019 at 10:36 comment added Peter Mortensen Re "still falls short of hydrocarbon energy density": in volume yes, but not in mass (though technically specific energy). Hydrogen has 142 MJ/kg whereas jet fuel has 43 MJ/kg (yes, 3.3 times more). Per volume it is 10 MJ/l and 37 MJ/l, respectively.
Feb 2, 2019 at 9:29 history edited Therac CC BY-SA 4.0
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Feb 2, 2019 at 9:14 history answered Therac CC BY-SA 4.0