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A comment on Ask HN: Is hydrogen likely to be a major source of power in the next 10 years?. Parent comment

Re:Ask HN: Is hydrogen likely to be a major source of power ... by funcDropShadow on Wednesday September 23, 2020 @03:50PM (#24571131)
But the energy density per mass is still better than Li-ion batteries.
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Re:Ask HN: Is hydrogen likely to be a major source of power ... by nickik on Wednesday September 23, 2020 @07:09PM (#24573327)
Li-ion batteries are improving at a faster rate, and you can use your gravitational energy to recharge the battery.
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Re:Ask HN: Is hydrogen likely to be a major source of power ... by dmurray on Wednesday September 23, 2020 @08:22PM (#24573902)
How does that work? You run your propellor in reverse like a wind turbine?

This doesn't sound completely ridiculous but is there even any proof of concept for that? The gravitational potential energy doesn't seem all that high - most airplane fuel is burnt maintaining height, not gaining it - to justify the complexity of recovering some small fraction of it. Still, I once thought the same about regenerative braking in electric cars.

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Re:Ask HN: Is hydrogen likely to be a major source of power ... by 8note on Wednesday September 23, 2020 @10:37PM (#24574740)
Hydrogen is a storage mechanism; there'd be a way to reclaim your energy either way
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