we make the hydrogen by using electricity to crack water (we make the electricity by burning coal)https://twitter.com/alexriesart/status/1426485113320218624 …
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5/ yeah, "solar to hydrocarbon" (i.e. growing corn) certainly works. But I was specifically going down the nuclear route, bc you get much higher energy generation per acre that way. A society that grows corn for all energy uses is a sad one, IMO. https://twitter.com/ITBeHa/status/1426533874386055171 …
even there it's not a clear winner low density and *extremely* low cryo temp means higher dry mass (volume + insulation), so the poor mass fraction takes part of the exhaust velocity gains right it can make sense for upper stages, which need max high energy performance
but it's also very expensive to handle, and if you care more about more mass to lower energies, then it starts to make less and less sense, because of the poor thrust of hydrolox engines (getting high mass flow is hard) this also makes it terrible for first stages
The best possible use for hydrogen has always been to make things lighter. Using it as fuel is dopey when you can use it to reduce the amount of fuel needed, like dirigibles. I've always been curious about the application of this & ground effect lift towards trains.
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