The combustion of hydrogen and oxygen is a very violent process. The German word for HHO gas translates as bang-gas. So, I am anticipating that, as a sort of co-generation process, I may have to stud an insulative blanket with a network of piezoelectric disks, covering the combustion chamber with said blanket, then putting a thick solid shell over the blanket, trapping the energy. And keeping the noise down.
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