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A comment on Aviation Is on a Low-Carbon Flight Path. Parent comment

Re:Aviation Is on a Low-Carbon Flight Path by simion314 on Thursday November 07, 2019 @01:44PM (#21476019)
Could we use Hydrogen that is generated sing clean electricity or is too dangerous?
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Re:Aviation Is on a Low-Carbon Flight Path by asdfadsfgfdda on Thursday November 07, 2019 @01:48PM (#21476058)
It's possible, but even liquid hydrogen is not very dense and requires a lot of insulation.

https://en.wikipedia.org/wiki/Tupolev_Tu-155

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Re:Aviation Is on a Low-Carbon Flight Path by __sy__ on Thursday November 07, 2019 @03:28PM (#21476942)
Liquid hydrogen has about 4X the specific energy of Jet-A. But yes, the system as a whole isn't great once you consider what it takes to keep the H2 liquid...
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Re:Aviation Is on a Low-Carbon Flight Path by sokoloff on Thursday November 07, 2019 @09:17PM (#21479475)
Energy density per unit of mass is about 3x in favor of hydrogen. Energy density per unit of volume is about 4x in favor of Jet-A.
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Re:Aviation Is on a Low-Carbon Flight Path by __sy__ on Thursday November 07, 2019 @10:57PM (#21479851)
Sorry you are absolutely correct. Volume matters a lot, maybe almost as much as weight, for aircraft design.
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