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A comment on The challenges of hydrogen for airliners, part 2: ecosystem. Parent comment

Re:The challenges of hydrogen for airliners, part 2: ecosystem by wcoenen on Monday August 03, 2020 @04:57PM (#24043315)
Only gaseous hydrogen is stored in heavy tanks under high pressure.

As explained in the article, gaseous hydrogen has been deemed infeasible for aviation and the idea is to use liquid hydrogen. No high pressure involved.

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Re:The challenges of hydrogen for airliners, part 2: ecosystem by supernova87a on Monday August 03, 2020 @05:10PM (#24043471)
Well, liquid hydrogen requires some pretty heavy insulating/cooling equipment, doesn't it?
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Re:The challenges of hydrogen for airliners, part 2: ecosystem by wcoenen on Monday August 03, 2020 @05:42PM (#24043807)
The insulation would likely be some type of spray-on foam over aluminum tanks, so not a lot of weight penalty there.

Cooling likely wouldn't be done, I assume any excess hydrogen boil-off that couldn't be burned immediately would be allowed to escape through an overpressure vent. (So ideally top it up right before taking off. There could still be a problem if the plane needs to queue a very long time for a congested runway.)

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