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To not take up deck space, it looks like they'll be more like this than sails:
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How do you account for wind direction with something like that? With a sail you can steer into the wind.
Fore and aft rigged ships sail into the wind pretty well, but square rigged ships were better outfitted for running with the trades. This design would probably do something similar, but yeah, next they'll invent masts and yardarms and booms, and then we'll be back to squabbling over trade routes in the Caribbean.
What an amazing invention. Wait until someone invents a wooden stick with a flattened end that you push through the water and propels vessels forward using only manual labor.