• Troy@lemmy.ca
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    2 months ago

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

    • huginn@feddit.it
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      2 months ago

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

      • Troy@lemmy.ca
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        2 months 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…