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Toyota's portable hydrogen cartridges look like giant AA batteries – and could spell the end of lengthy EV charging (www.techradar.com)

submitted 1 month ago by [email protected] to c/[email protected]

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[–] [email protected] 10 points 1 month ago (1 children)

Special exception maybe for aviation and rocketry. But even then, methane (if made using green energy and the Sebatier process).

[–] [email protected] 6 points 1 month ago (1 children)

You can get comparable isp with methalox engines without any of the weight required to keep the hydrogen inside the rocket, right?

[–] [email protected] 3 points 1 month ago

Hydrogen ISP is still king by a significant margin, but ISP isn't the whole story -- hydrogen comes with additional tank weight (due to lower density) and storage issues (pesky molecular size...). So that trade-off for ISP only really makes sense for an upper stage like Centaur. I'm not sure it makes sense for New Shepherd even...