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Post by kris on Jan 23, 2023 11:58:21 GMT
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Post by Telemachus on Jan 23, 2023 13:16:49 GMT
Great if you want to travel more or less directly downwind. Otherwise hopeless on a conventional hull without a deep keel.
It worked better in the last millennium when they had proper sailing boats, so they are just reinventing the wheel, and badly.
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Post by kris on Jan 23, 2023 13:20:29 GMT
Great if you want to travel more or less directly downwind. Otherwise hopeless on a conventional hull without a deep keel. It worked better in the last millennium when they had proper sailing boats, so they are just reinventing the wheel, and badly. There is an increase in using sailing ships for carrying cargo again as well. Usually expensive luxury products, so they can be sold at a premium. With this kite they reckon 20% savings on fuel so not insubstantial.
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Post by bills on Jan 24, 2023 10:34:52 GMT
Great if you want to travel more or less directly downwind. Otherwise hopeless on a conventional hull without a deep keel. It worked better in the last millennium when they had proper sailing boats, so they are just reinventing the wheel, and badly. Ypu would think it would be fairly simple to install drop keels on the side, like the ones on the Thames barges. That would improve the sailing qualities
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Post by Aloysius on Jan 24, 2023 15:51:23 GMT
The cool thing about the notion is that it doesn't need masts or other complicated forms of rigging, and I would imagine that the height at which the foil operates could be considerable, which would give it more power. Also it probably doesn't impact cargo capacity and could be doused quickly. But you would need something more than a lee board to use it more than a few degrees off the wind. Some words by someone educated on the subject: www.ecomarinepower.com/en/articles-and-papers/11-media-articles/146-rigid-sails-for-modern-powered-ships
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Post by on Jan 24, 2023 16:34:22 GMT
Must admit I thought powerkites only worked when they were moving through air and generating lift.
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Post by Aloysius on Jan 24, 2023 16:55:23 GMT
The physics of exactly how a modern sail provides power, especially when sailing close to the wind, is a very interesting subject about which much has been written. But what happens if you hold a bag in front of you with your back to the wind is somewhat more straightforward.
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Post by Tony Dunkley on Jan 24, 2023 17:23:38 GMT
Great if you want to travel more or less directly downwind. Otherwise hopeless on a conventional hull without a deep keel. It worked better in the last millennium when they had proper sailing boats, so they are just reinventing the wheel, and badly. Ypu would think it would be fairly simple to install drop keels on the side, like the ones on the Thames barges. That would improve the sailing qualities Scaling up leeboards to a suitable size to be effective on large ship isn't simple, . . or practical, . . or economically viable, . . and neither would they make any improvement at all to what you call 'sailing qualities' under a joke of a rig that will only work with the wind coming almost directly from astern. All that leeboards would achieve would be to generate additional hull resistance - cancelling out the questionable gains to be had from flying an oversized kite from the ship's weather deck.
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Post by on Jan 24, 2023 17:40:07 GMT
This is an airfoil which needs to be moving in order to create lift. There must be a system on the boat to "steer" the "kite* from side to side otherwise it won't do anything.
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Post by Aloysius on Jan 24, 2023 17:52:22 GMT
Yebbut it moves coz the wind is behind it innit
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Post by Aloysius on Jan 24, 2023 17:58:56 GMT
Ypu would think it would be fairly simple to install drop keels on the side, like the ones on the Thames barges. That would improve the sailing qualities All that leeboards would achieve would be to generate additional hull resistance Also under downwind conditions the leeboards would add to the tendency to induce roll, although it's difficult to imagine that a ship that size would be in much danger of the other potential negative aspect, which is to broach.
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Post by kris on Jan 24, 2023 18:49:31 GMT
This is an airfoil which needs to be moving in order to create lift. There must be a system on the boat to "steer" the "kite* from side to side otherwise it won't do anything. why not read the article? It tells you it flies in figure eights
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Post by on Jan 24, 2023 19:07:06 GMT
That must be quite a complex mechanism.
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Post by kris on Jan 24, 2023 19:50:15 GMT
That must be quite a complex mechanism. read the article. I don’t think these big shipping companies would be buying it if it didn’t work.
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Post by on Jan 24, 2023 19:54:43 GMT
I got as far as "decarbonisation" then it all got slightly boring. If people really wanted to do something then these huge ships would not exist in the first place.
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