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Diesel electric to waterjets would work, but it would be very heavy. With any diesel electric system you would need the diesel engine, a generator then an electric motor and the waterjet. All of these are very heavy including the waterjet since it is full of water. What I would like to see is a fuel cell coupled to a superconducting electric motor either podded or turning a waterjet. A search on this forum for "fuel cell" will turn up more results than you can expect. Fuel cells; clean, quiet, no moving parts and a good source of fresh water for your yacht! Actually I am not sure about the drinking part, does anyone know if fuel cell exhaust is potable? I don't see why not...
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