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It isn’t a question of reusable type - you need to have fuel and oxidizer to burn things. A truck can use atmospheric oxygen for the oxidizer; a rocket can’t.

I also imagine that the extra weight of the aluminum pucks would tank your Isp (though I suppose you might be able to make back some tank weight).




I willfully? missed that the O in the water binds to the Al so is unavailable for combustion (it has to, otherwise what gets consumed?).

Oh, another take, it is a molecular pump that removes oxygen from the environment and turns it into water, via burning.




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