Originally Posted by
fruitflyer
H2 has 3 times the energy density of fossil fuels PER KILO. So ideally, the fuel mass should only be a third for the same stored energy, ignoring all other factors (storage, efficiency ...)
But the volume is significantly higher, so trading off some of that gain against increase sized tanks, larger structures, more drag &c. I find the whole thing absolutely fascinating and if 2050 really is the target look forward to flying some of these things before I retire.
What sort of issues are hiding in there? Is fuel gauging with cryogenics (if that’s the route they take) much harder? I almost wish I were clever enough/made the right career choices to be involved in development.