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Compressing air by utilising wave energy while passage making or at anchor:—
Mono-hulls could have a swing keel, damped by double acting, robust hydraulic rams. The damping could ease the motion of the yacht while extracting useful power from wave action. Some of that could feed getto blasters and fish attractors; some could be stored as compressed air. A good used Volvo 60 would make an interesting test bed; it has a swing keel already.
Catamarans could be designed to look like trimarans: with central accommodation that moves with wave action; carefully damped with hydraulic rams and the energy extracted used for a variety of purposes, including compressing air. It could be used to electrolyse water, too: compressing the hydrogen and oxygen separately.
As the gasses are used they could run through motors for one source of power. The oxygen would be great for hyperbaric treatment of hangovers and other disabilities. The hydrogen for newer designs of fuel cells. When several systems can use the stored gasses it becomes more useful. I do just hope you don't think I'm joking...
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