Are there any boats that have anterior instead of dorsal sails to take greater advantage of currents vs winds?
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Replying to @drethelin
That's a keel. And, yes, all of them. Sail boats work on the DIFFERENTIAL between current and wind. Note that bc water is so dense, small keels accomplish as much as large sails.
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Replying to @drethelin
Guess I'll return those naval engineering textbooks and ask for a refund
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Replying to @MorlockP @drethelin
Also a sea anchor works on the same principles.
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Replying to @JASutherlandBks @drethelin
A barge, with very little cross sectional area beneath the water line, is influenced maybe half by wind acting above the waterline and half by water pushing below the water line. A boat with a keel has a HUGE subsurface sail area and will move 99% with the currents.
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There is basically no way to make a boat with reefed sails respond MORE to water currents than it already is, bc it's moving 100% with the water. It's like asking "why don't hot air balloons have sails ?". They ARE sails. Boats with keels ARE "water sails".
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concur w
@JASutherlandBks re sea anchors. Tho the really interesting thing about them is that they move the two forces acting on the boat very far apart. A ton of naval architecture is thinking about where forces act on a boat (center of gravity vs center buoyancy vs center wind)1 reply 0 retweets 1 like
and a sea anchor, like a regular anchor, provides a force on the system that is WAY offset from the others in the balloon analogy, I've thought - for a fantasy campaign world - of the idea of a balloon dropping a "wind anchor" into different lower windstreams (unrealistic IRL)
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