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Botlawson t1_je1es5k wrote

For a Hypersonic craft hydrogen has some small advantages that don't apply to most others vehicles. First it burns exceptionally fast. This shrinks the engines. Second it has an extremely high specific heat so pound for pound you can dump a lot more heat from the frame and engine into the fuel before burning it.


MightyH20 t1_je4bktn wrote

Third, using Hydrogen cools down various propulsion systems due to pressure difference when distributed to the combustion engine.