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Post by Deleted on Jan 30, 2016 4:05:23 GMT
In the same way you avoid waves by driving a WIG boat vs a bass boat, getting the bulk of the seastead out of the waves will lower stresses on the structure and the inhabitants. There's a number of USA lighthouse towers that were built of steel or iron trusses, over 100 years ago, that are still standing and in service. There's also the quite large Frying Pan and Diamond Shoals towers, which have been up 50+ years. All the existing towers don't float, they are securely anchored by screw piles to the bottom. But oil platforms prove the tower structure can be floated. A seastead tower need not support a million tons of drill pipe and machinery, doesn't generate the deck forces to drill a mile thru rock, and so doesn't need the 50ft x 50ft tower legs the oil industry requires, just like Frying Pan and Diamond Shoals towers don't. I suspect that by using smart design, and thorough testing, some legs could be made that look invisable to the average wave, and interact very little with any waves. These could be set on various forms of deeply submerged dynamic floatation, and heave plates, to keep all the large areas of the seastead out of the active wave zone. With a wide enough base, hurricane winds can be tolerated, just as spars and oil platforms do now. Attachments:
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Post by gordien on Feb 2, 2016 3:17:06 GMT
I thought of something similar to that after watching the TED Talks with Bob Ballard. A version of a flip ship, but smaller. 3 could be tethered together in a triangle formation. Later you could add as many more as you wanted - could be separated if you wanted. It's just like Kat is saying (more of less). Various tanks go in the bottoms. Artificial reefs go below and between. Gardens and solar panels on top. I was looking at Gizmag yesterday and saw a self filling water bottle.... From us. It is a small solar powered water condenser. Could be perfect at sea.
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Post by Deleted on Feb 2, 2016 3:46:17 GMT
Gordien , i think the hull of a 350ft FLIP ship is too massive to avoid waves. The ships are not as stable as they are made out to be. While publicity is sparse, i have seen reports from customers that the hull sways side to side as the waves mount up against one side or the other. It doesn't move up and down a lot, as a 10ft wave is a small percent of the 300ft it is deep, and the entire ship's inertia must be overcome in a single vertical line. The 3 towers standing (two of which i provided pics of) that support living on them, have ~4ft diameter legs, and people aboard mention they can feel large wave impacts (and there's reportedly 25ft waves there during hurricanes). By "legs could be made that look invisable to the average wave, and interact very little with any waves", i mean 8 inch to 12 inch diameter structural tubing as legs, braced with 4 inch to 6 inch tubing.
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Post by gordien on Feb 3, 2016 5:15:54 GMT
Kat, I agree that 350 feet is too big. The platforms you show look top heavy to me (but I think you said these are sea floor mounted). I might feel better with a dozen legs. Would something like that be sailable if it had the proper floats? I hope I can really participate in helping to build some structure, and setting up the various gardening systems. So much of what I have done in my life using alternative energy and self sufficient living would all have value here. What a great project.
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Post by Deleted on Feb 3, 2016 6:31:32 GMT
Kat, I agree that 350 feet is too big. The platforms you show look top heavy to me (but I think you said these are sea floor mounted). I might feel better with a dozen legs. Would something like that be sailable if it had the proper floats? I hope I can really participate in helping to build some structure, and setting up the various gardening systems. So much of what I have done in my life using alternative energy and self sufficient living would all have value here. What a great project. Those are terribly top heavy, and they are anchored into the bottom. They are also huge. They are repurposed oil platforms, totally too heavy for our use, especially if we want to have them float on submerged floaties. I was figuring a post at each corner of a 16x16 or 20x20 platform, close enough for inexpensive sturdy cross bracing. If i built a platform as large as those, it would be much lighter (you can land dozens of tons of helicopter and hold 50 guys on those), and have at least 16 thin braced legs. In calm weather, it could also sink lower by ballasting the floatation tanks. Those towers legs i showed above also have near vertical legs. For my design the outer legs would cant strongly outwards towards the water, as diagonal bracing and load supports. Of course, two or more 16x16 or 20x20 (or similar) can be grouped together on the same floaties. They need not stand totally apart. You can build one and liv on it as you build the additions. Total size isn't restricted by anything but your wallet, and the scale of the engineering, and active ballast controls and floatation.
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Post by johngalt on May 10, 2016 23:55:37 GMT
Depending on the height Kat you might accomplish this with a Trimaran design. The pontoons could be used for storage and counterbalance. The center could also have a decent surface area.
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Post by Deleted on May 11, 2016 1:33:21 GMT
Depending on the height Kat you might accomplish this with a Trimaran design. The pontoons could be used for storage and counterbalance. The center could also have a decent surface area. A trimaran is made to float on the surface. Being that is where the waves are, i was trying to avoid that particular area for living on. I believe the proper living space is going to be above the waves, with the floatation below the waves, with as little interaction with the waves as technologically possible. Of course, everyone else's opinion will vary.
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Post by johngalt on May 11, 2016 1:45:57 GMT
I was thinking more of a tower on a trimaran. maybe a design where the outside pontoons could be dropped and flooded? I wish I could draw what I am thinking of, it is difficult to explain.
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Post by jeff on May 11, 2016 4:57:49 GMT
Here's a Little pontoon semi-submersible I found and posted to TSI some time ago...
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