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dustofdeath t1_iyafyit wrote

Reply to comment by UnCommonSense99 in Rolls-Royce successfully tests hydrogen-powered jet engine by je97

It would have more than enough energy density for all domestic flights.

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UnCommonSense99 t1_iyet61t wrote

You are technically correct..... But given a choice between having some small fuel tanks full of biodiesel or some much larger and heavier fuel tanks full of hydrogen; what do you think will work best?

( I assume you realise that it's much easier to run a jet engine on diesel than it is to run it on hydrogen)

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dustofdeath t1_iyexm6x wrote

Hydrogen is 2.8x more energy dense than kerosene for the same unit of mass. But needs four times more volume.

Meaning you actually need less fuel - so it almost negates the increased volume issue. Especially if the efficiency of fuel to thrust is better than fossil fuels.

I believe AirBus is already planning a commercial plane by 2035. So there likely have been developments on how to properly store liquid hydrogen (that eliminates the volume issue). The ZEROe.

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