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by sofixa 482 days ago
> I grow so tired of people simping for hydrogen when batteries just win in every metric aside from the initial build cost, which when amortized over the life of the battery, will beat out hydrogen

Batteries suck in energy density and weight and in some cases, that really matters. Battery electric planes are not even close to being feasible other than for very small in size and range planes. Hydrogen is at least feasible.
2 comments
Sohcahtoa82 482 days ago
I challenge the assertion that hydrogen is feasible.

Is hydrogen more energy dense (in either energy per unit volume OR per unit weight) than traditional fuels?

It might be better than batteries, but I'd be surprised if it was any better than current fuels.

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GJim 482 days ago
> Is hydrogen more energy dense ... than traditional fuels

Chemically, yes. But in reality, very far from it.

The bulky high pressure cylinders needed to store the gas (unlike propane etc, it doesn't liquify) easily weigh an order of magnitude more than the mass of gas they contain.

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wstrange 482 days ago
Bio-Fuel seems more practical.

It reuses all the existing infrastructure and requires no engine modifications.

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sofixa 482 days ago
No. It's practically impossible to scale them to the required level

https://www.youtube.com/watch?v=ADpsUhdIO4w a video by a pilot on SAF and why it just won't cut it.

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