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...tiny, hydrodynamic, underpowered ones? As usual, the use case is a constraint. Speed/range, capacity, deck area.
Here's a technique for massive ships that should scale down:
Catamaran for deck area.
www.youtube.com/results?search_query=tech+ingredients+catamaran
How Many Solar Panels Do You Need For A Trolling Motor?
klbuckyians.blogspot.com/2009/03/mechanical-jellyfish.html
Quote:
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One of his [Buckminster Fuller's] early inventions was a mechanical oar patterned after the motion of jellyfish. "It consisted of a tepee-like cone mounted on the end of a pole and resembled an inside-out umbrella. Standing at the rear of his boat, Fuller would pull the pole toward him through a large iron ring attached to the rear of the boat. As the peak of the umbrella-like invention pointed toward the boat, it displayed little resistance. However, when it pushed backward into the water, the cone opened, propelling the boat forward."
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