https://wiki.seasteading.org/api.php?action=feedcontributions&user=204.14.248.131&feedformat=atomSeasteading - User contributions [en]2024-03-29T15:30:48ZUser contributionsMediaWiki 1.31.1https://wiki.seasteading.org/index.php?title=User:Vincecate/KiteAndSeaAnchor&diff=1893User:Vincecate/KiteAndSeaAnchor2008-08-18T11:28:30Z<p>204.14.248.131: </p>
<hr />
<div>There are at least two companies making kites to pull ships:<br />
* [http://www.skysails.info/ skysails]<br />
* [http://www.kiteship.com/ kiteship]<br />
* [http://kiteforsail.com/ kiteforsail]<br />
<br />
With a two rope kite you can have it pull you to the left or right of downwind by maybe 75 degrees. So you can use it to pull you in the direction you want if you are mostly moving in the direction of the wind as you might with a [[User:Vincecate/Migration|migration]]. A computer can control the kite. By adjusting where it is in the sky and if it is moving back and forth the computer can control how much it pulls and what the average direction of pull is. <br />
<br />
A sea anchor can slow down a seastead. With no kite, the wind on a [[User:Vincecate/Tension_circle_house|Tension Circle House]] might push it faster than a [[User:Vincecate/Pipe_Spar|Pipe Spar]] with a kite. So for a group of different seasteads to travel together sea anchors would be good to have. Also, some seasteads would need sea anchors to go slow enough for an annual migration. <br />
<br />
A fleet of seasteads with kites and sea anchors would need their computers to be able to communicate so the whole fleet could move in formation without bumping into each other.<br />
<br />
==Force from kite==<br />
<br />
<br />
Skysails says [http://www.skysails.info/fileadmin/user_upload/Pressedownload/Dokumente/EN_Technology_Information.pdf their kite product line] provide around 8, 16, or 32 tons of force in the direction of movement for their rating conditions. Their rating conditions are 25 knots wind, 10 knots movement, and wind at 130 degrees. We are probably more like 16 knots wind and 1 knots movement, but that should be about the same force.<br />
<br />
<br />
<br />
==Power generation==<br />
<br />
There is a some angle, maybe 40 degrees above horizon, and swooping back and forth in a figure-8 that gives the optimal pull. When they want to winch in a kite they keep in rather still almost directly above so it does not pull so much. It would be possible to generate power with the kite going out at the optimal pull conditions and using much less power to winch it in at the optimal winching conditions. Given the large forces this should be substantial. <br />
<br />
In a ship you may be able to use the movement through the water to turn the propellers and from this a generator.<br />
<br />
Either way you would sacrifice some of your speed but this can all be worked out with the proper sizing of the kite.</div>204.14.248.131https://wiki.seasteading.org/index.php?title=User:Vincecate/Models&diff=1762User:Vincecate/Models2008-08-11T12:43:55Z<p>204.14.248.131: /* Discussion in forum */</p>
<hr />
<div>[[Image:AmoniBall.jpg]]<br />
[[Image:Models.jpg]]<br />
[[Image:Modelsonbeach.resized.jpg]]<br />
<br />
The plan is to use similar amounts of plastic in 7 different models that are each 1/25th scale and compare them in similar wave conditions in Island Harbor, Anguilla. <br />
<br />
I am going to assume [[User:Vincecate/Migration | migration]] makes 25 foot waves the largest we have to deal with because with a 1:25 scale model that makes for a nice round number, a 1 foot wave. This also means that full scale versions need to be able to move at between 0.5 and 1 MPH, so I will try to measure the force needed for the corresponding speeds in the models. <br />
<br />
With a 25 foot maximum wave measured trough to crest, we sort of only need 12.5 feet above average water level. But with rogue waves and safety margins, lets design for 25 feet above average water level. Seems like a spar with 25 feet above water could have a total length of 250 feet. Scaled down for 1:25 model we could use 10 feet of PVC pipe. If I use 2 inch diameter pipe in the models that is like 50 inches diameter in the full scale version.<br />
<br />
[[Cost estimation]] sort of indicates that the same weight steel ships are about the same cost. So if PVC in the models is replaced by steel in the full scale versions, equal weights will be roughly equal costs. However, the ratio of model thickness to prototype thickness is not going to be the same for all the different models. Also, these models are not all the same weight. So I don't claim that these models are really a fair comparison but close enough that we may learn something. <br />
<br />
==Models and Results==<br />
<br />
* [[User:Vincecate/Tension_circle_house|Tension Circle House]] - 8 sides of 2-foot each<br />
* [[User:Vincecate/Models/Multispar|multi-spar model]] (funded by {{U|Joep}})<br />
* [[User:Vincecate/Pipe_Spar|Pipe Spar]] - [[User:Vincecate/Models/SparBuoy| Spar Buoy model]] 10 feet of 2 inch pipe (7.5 lbs) Put a T on top and cut it in half so have a flat thing I can put a test platform on with rubber bands.<br />
* [http://www.youtube.com/watch?v=8AauaD68rCU Short-Fat Pipe Spar] - 3.5 feet of 4 inch pipe - 10 lbs total <br />
* [[User:Vincecate/Models/Catamaran|Catamaran]] - Catamaran made from PVC pipe<br />
* 14 inch buoy/ball with hanging ballast - so modeling about a 30 foot ball - This is [[User:Vincecate/BallHouse]] but also kind of the [http://givensliferafts.com givens life raft design] and a lot like the [[User:Vincecate/GeodesicVessel]] approach. Model weight not counting ballast 7.5 lbs - 20 lbs steel ballast<br />
* [[User:Vincecate/Models/ShortCylinder|Short Cylinder]] - using a 5 gallon paint bucket for model - 4 lbs - 20 lbs steel ballast<br />
* [[User:Vincecate/Models/HangingBallast|Hanging Ballast]] - used for Short Cylinder and Ball model - 4 strings to single ballast in middle<br />
<br />
==Models not yet planned==<br />
<br />
* semisubmersible - can have square or triangle of pipes underwater and legs sticking up or frame on top legs down<br />
* raft made by lashing pipes together - 5 pieces with 2 cross pieces underwater (120-(2*12)/5= ~19 inches for 5 pieces<br />
<br />
==Cameras and methods for shooting video==<br />
<br />
Shot video from a kayak, a pier, the model, and while floating in a lifejacket near the model. The last method is my favorite. I had a PVC version of a "poor man's steadycam" to help keep the camera steady and out of the water while my arms were underwater. It is nice to have some land or pier in the background so you can have some idea how much the camera is moving when you watch the video. I used a [http://www.amazon.com/Vivitar-VIVICAM-6200W-MegaPixel-Underwater-Digital/dp/B000QCI65I/ref=pd_bbs_sr_1?ie=UTF8&s=electronics&qid=1216608411&sr=8-1| Vivitar 6200W waterproof camera] and am happy with it. It was about $120 and has 6 megapixels and shoots video at 320 by 240 which is perfect for youtube. I put in a 2 GB flash card and this was plenty for holding the videos. Had trouble accessing the videos over the USB cable and so have been taking out the flash card and putting it in a flash reader on my computer.<br />
<br />
Some videos had a cup of water on the model to help see how stable it was. How much water the water moved and also how much was still in the cup at the end both give some idea of how stable it is. I tried to use different colors for different days. Washable paint from my child's craft supplies worked well.<br />
<br />
When the camera is on the model and the cup is in front you can really see the motion of the water.<br />
<br />
It is nice to see waves coming toward the model so I try to have the coming waves in the background. <br />
<br />
A camera in a tripod at the end of a pier works well. Just put the model in the water upwind a bit and let it float toward the pier. This way the camera is stable and dry. So you can use any camera you want. I used a [http://www.amazon.com/Canon-PowerShot-Digital-Camera-Optical/dp/B000HARTYI/ref=pd_bbs_1?ie=UTF8&s=electronics&qid=1216609030&sr=8-1 Canon Powershot A640] which I like.<br />
<br />
The video we shot from a kayak had too much camera motion.<br />
<br />
==Force for Scale model speed testing==<br />
<br />
The force on a scale model should scale with the mass, which is with the cube of the scaling factor.<br />
So for a 1/25th scale model, the force should be 1/15625. So we have:<br />
<br />
8 ton kite --> 1 lb<br />
16 ton kite --> 2 lbs<br />
32 ton kite --> 4 lbs<br />
<br />
With a known weight being pulled down by gravity you can provide the same force to the model by connecting a rope between the model and the weight over a pulley. Just have to keep pulling the pulley forward at the right speed so that the weight stays between the pulley and the ground or water. With my [http://www.hobiecat.com/kayaking/models_outback.html Hobie pedal powered kayak] I think this will be easy enough.<br />
<br />
However, a similar weight and pulley walking alongside a pool is probably easier. So I may just do that. But the deepest pool I have access to is just over 6 feet deep.<br />
<br />
With speed results from this we can see how fast such a kite could pull a full sized seastead. This will tell us if the migration idea is plausible.<br />
<br />
==Ballast weights==<br />
<br />
For the weight on our force meter I could use a water jug where I can adjust the amount of water to see what works. <br />
<br />
For ballast<br />
* weights from weight set<br />
* sand in plastic bags or jugs (did not like bags)<br />
* washers, cement, lead<br />
* steel rebar - my 1/2 inch rebar was 1 lb per foot. So I could make exactly the size weights I needed.<br />
<br />
==Modeling in general==<br />
<br />
* [[Scale models]]<br />
<br />
==Sponsors==<br />
<br />
We had one model sponsored: <br />
<br />
* multi-spar - {{U|Joep}} (already paid)<br />
<br />
==Making video for youtube==<br />
<br />
I used Windows Movie Maker to process the video. Here are the steps I took to make a compressed and slowed video for youtube of less than 10 minutes (their limit):<br />
* import video (maybe by clicking "make movie" in photo album) and then drag it from top to work area<br />
* Click on "effects", then drag/drop the effect "Slow Down, Half" on the work video twice for slowdown by 4 (would really like 5 for 1:25 scale models but don't see any way to do that)<br />
* scroll right to find a spot just before 10 minutes on work video, mark it, then click "split" and then delete rest (could delete other parts as long as final video is less than 10 minutes)<br />
* click on "+" next to "video" to left of work video, this separates the audio track, then right click on audio track and select "mute". Slowed down audio is not useful and uses up bandwidth.<br />
* click "publish movie" at the top, then "this computer", then "next", then either use name or change and hit "next" again, then select "compress video". If it is larger than 320 by 240 I reduce the allowed "MB" till it says 320 by 240. Then I click "publish".<br />
* go to youtube.com and upload video<br />
<br />
==Measuring wind speed==<br />
<br />
To investigate spar leaning I was thinking of ways to measure the wind speed. I have an idea I like but have not yet tried. The idea is to have a measured 10 feet along the beach in the direction of the wind and release a balloon just beyond the upwind end of this while shooting video. When this video is slowed down by 4 and watched on a player with a pause button it should be easy enough to measure how long the balloon takes to cover the 10 feet. Then 1.467 feet per second is 1 MPH. <br />
<br />
Can setup the camera on a tripod and start filming, then walk over to release the balloon. Can then edit out the walk over.<br />
<br />
Could also do without the tripod if had a board on a string holding down the balloon. Could then pull the string to release the balloon while holding the camera aimed in the right direction.<br />
<br />
==General Impressions==<br />
<br />
This section is for subjective impressions of the experimenter. <br />
<br />
First, the spar models are very sensitive to having the right amount of ballast. If it is too much waves can go over the top and if it is too little they have so much out of the water that they lean over. Also, spar models lean in simulated hurricane winds without any model house on top. I think there will be a leaning problem with a model house and more typical wind speeds.<br />
<br />
Long spars are not going to be able to get close to some harbors. My 10 foot spar model could not get into the harbor closest to my house. A full scale one would have trouble getting within 20 miles of this harbor. If you have to go that kind of distance in a small boat to get to shore, people are not going to go ashore much.<br />
<br />
The tension circle leaning and sideways movement compensate each other so that neither is as bad as they would be along. So while the structure has some movement the water has very little.<br />
<br />
==Discussion in forum==<br />
<br />
There is a [http://seasteading.org/interact/forums/engineering/structure-designs/side-side-structure-model-testing thread on this model testing] in the forum.</div>204.14.248.131https://wiki.seasteading.org/index.php?title=User:Vincecate/Models&diff=1761User:Vincecate/Models2008-08-11T12:05:48Z<p>204.14.248.131: /* Models in testing */</p>
<hr />
<div>[[Image:AmoniBall.jpg]]<br />
[[Image:Models.jpg]]<br />
[[Image:Modelsonbeach.resized.jpg]]<br />
<br />
The plan is to use similar amounts of plastic in 7 different models that are each 1/25th scale and compare them in similar wave conditions in Island Harbor, Anguilla. <br />
<br />
I am going to assume [[User:Vincecate/Migration | migration]] makes 25 foot waves the largest we have to deal with because with a 1:25 scale model that makes for a nice round number, a 1 foot wave. This also means that full scale versions need to be able to move at between 0.5 and 1 MPH, so I will try to measure the force needed for the corresponding speeds in the models. <br />
<br />
With a 25 foot maximum wave measured trough to crest, we sort of only need 12.5 feet above average water level. But with rogue waves and safety margins, lets design for 25 feet above average water level. Seems like a spar with 25 feet above water could have a total length of 250 feet. Scaled down for 1:25 model we could use 10 feet of PVC pipe. If I use 2 inch diameter pipe in the models that is like 50 inches diameter in the full scale version.<br />
<br />
[[Cost estimation]] sort of indicates that the same weight steel ships are about the same cost. So if PVC in the models is replaced by steel in the full scale versions, equal weights will be roughly equal costs. However, the ratio of model thickness to prototype thickness is not going to be the same for all the different models. Also, these models are not all the same weight. So I don't claim that these models are really a fair comparison but close enough that we may learn something. <br />
<br />
==Models and Results==<br />
<br />
* [[User:Vincecate/Tension_circle_house|Tension Circle House]] - 8 sides of 2-foot each<br />
* [[User:Vincecate/Models/Multispar|multi-spar model]] (funded by {{U|Joep}})<br />
* [[User:Vincecate/Pipe_Spar|Pipe Spar]] - [[User:Vincecate/Models/SparBuoy| Spar Buoy model]] 10 feet of 2 inch pipe (7.5 lbs) Put a T on top and cut it in half so have a flat thing I can put a test platform on with rubber bands.<br />
* [http://www.youtube.com/watch?v=8AauaD68rCU Short-Fat Pipe Spar] - 3.5 feet of 4 inch pipe - 10 lbs total <br />
* [[User:Vincecate/Models/Catamaran|Catamaran]] - Catamaran made from PVC pipe<br />
* 14 inch buoy/ball with hanging ballast - so modeling about a 30 foot ball - This is [[User:Vincecate/BallHouse]] but also kind of the [http://givensliferafts.com givens life raft design] and a lot like the [[User:Vincecate/GeodesicVessel]] approach. Model weight not counting ballast 7.5 lbs - 20 lbs steel ballast<br />
* [[User:Vincecate/Models/ShortCylinder|Short Cylinder]] - using a 5 gallon paint bucket for model - 4 lbs - 20 lbs steel ballast<br />
* [[User:Vincecate/Models/HangingBallast|Hanging Ballast]] - used for Short Cylinder and Ball model - 4 strings to single ballast in middle<br />
<br />
==Models not yet planned==<br />
<br />
* semisubmersible - can have square or triangle of pipes underwater and legs sticking up or frame on top legs down<br />
* raft made by lashing pipes together - 5 pieces with 2 cross pieces underwater (120-(2*12)/5= ~19 inches for 5 pieces<br />
<br />
==Cameras and methods for shooting video==<br />
<br />
Shot video from a kayak, a pier, the model, and while floating in a lifejacket near the model. The last method is my favorite. I had a PVC version of a "poor man's steadycam" to help keep the camera steady and out of the water while my arms were underwater. It is nice to have some land or pier in the background so you can have some idea how much the camera is moving when you watch the video. I used a [http://www.amazon.com/Vivitar-VIVICAM-6200W-MegaPixel-Underwater-Digital/dp/B000QCI65I/ref=pd_bbs_sr_1?ie=UTF8&s=electronics&qid=1216608411&sr=8-1| Vivitar 6200W waterproof camera] and am happy with it. It was about $120 and has 6 megapixels and shoots video at 320 by 240 which is perfect for youtube. I put in a 2 GB flash card and this was plenty for holding the videos. Had trouble accessing the videos over the USB cable and so have been taking out the flash card and putting it in a flash reader on my computer.<br />
<br />
Some videos had a cup of water on the model to help see how stable it was. How much water the water moved and also how much was still in the cup at the end both give some idea of how stable it is. I tried to use different colors for different days. Washable paint from my child's craft supplies worked well.<br />
<br />
When the camera is on the model and the cup is in front you can really see the motion of the water.<br />
<br />
It is nice to see waves coming toward the model so I try to have the coming waves in the background. <br />
<br />
A camera in a tripod at the end of a pier works well. Just put the model in the water upwind a bit and let it float toward the pier. This way the camera is stable and dry. So you can use any camera you want. I used a [http://www.amazon.com/Canon-PowerShot-Digital-Camera-Optical/dp/B000HARTYI/ref=pd_bbs_1?ie=UTF8&s=electronics&qid=1216609030&sr=8-1 Canon Powershot A640] which I like.<br />
<br />
The video we shot from a kayak had too much camera motion.<br />
<br />
==Force for Scale model speed testing==<br />
<br />
The force on a scale model should scale with the mass, which is with the cube of the scaling factor.<br />
So for a 1/25th scale model, the force should be 1/15625. So we have:<br />
<br />
8 ton kite --> 1 lb<br />
16 ton kite --> 2 lbs<br />
32 ton kite --> 4 lbs<br />
<br />
With a known weight being pulled down by gravity you can provide the same force to the model by connecting a rope between the model and the weight over a pulley. Just have to keep pulling the pulley forward at the right speed so that the weight stays between the pulley and the ground or water. With my [http://www.hobiecat.com/kayaking/models_outback.html Hobie pedal powered kayak] I think this will be easy enough.<br />
<br />
However, a similar weight and pulley walking alongside a pool is probably easier. So I may just do that. But the deepest pool I have access to is just over 6 feet deep.<br />
<br />
With speed results from this we can see how fast such a kite could pull a full sized seastead. This will tell us if the migration idea is plausible.<br />
<br />
==Ballast weights==<br />
<br />
For the weight on our force meter I could use a water jug where I can adjust the amount of water to see what works. <br />
<br />
For ballast<br />
* weights from weight set<br />
* sand in plastic bags or jugs (did not like bags)<br />
* washers, cement, lead<br />
* steel rebar - my 1/2 inch rebar was 1 lb per foot. So I could make exactly the size weights I needed.<br />
<br />
==Modeling in general==<br />
<br />
* [[Scale models]]<br />
<br />
==Sponsors==<br />
<br />
We had one model sponsored: <br />
<br />
* multi-spar - {{U|Joep}} (already paid)<br />
<br />
==Making video for youtube==<br />
<br />
I used Windows Movie Maker to process the video. Here are the steps I took to make a compressed and slowed video for youtube of less than 10 minutes (their limit):<br />
* import video (maybe by clicking "make movie" in photo album) and then drag it from top to work area<br />
* Click on "effects", then drag/drop the effect "Slow Down, Half" on the work video twice for slowdown by 4 (would really like 5 for 1:25 scale models but don't see any way to do that)<br />
* scroll right to find a spot just before 10 minutes on work video, mark it, then click "split" and then delete rest (could delete other parts as long as final video is less than 10 minutes)<br />
* click on "+" next to "video" to left of work video, this separates the audio track, then right click on audio track and select "mute". Slowed down audio is not useful and uses up bandwidth.<br />
* click "publish movie" at the top, then "this computer", then "next", then either use name or change and hit "next" again, then select "compress video". If it is larger than 320 by 240 I reduce the allowed "MB" till it says 320 by 240. Then I click "publish".<br />
* go to youtube.com and upload video<br />
<br />
==Measuring wind speed==<br />
<br />
To investigate spar leaning I was thinking of ways to measure the wind speed. I have an idea I like but have not yet tried. The idea is to have a measured 10 feet along the beach in the direction of the wind and release a balloon just beyond the upwind end of this while shooting video. When this video is slowed down by 4 and watched on a player with a pause button it should be easy enough to measure how long the balloon takes to cover the 10 feet. Then 1.467 feet per second is 1 MPH. <br />
<br />
Can setup the camera on a tripod and start filming, then walk over to release the balloon. Can then edit out the walk over.<br />
<br />
Could also do without the tripod if had a board on a string holding down the balloon. Could then pull the string to release the balloon while holding the camera aimed in the right direction.<br />
<br />
==Discussion in forum==<br />
<br />
There is a [http://seasteading.org/interact/forums/engineering/structure-designs/side-side-structure-model-testing thread on this model testing] in the forum.</div>204.14.248.131https://wiki.seasteading.org/index.php?title=Life_rafts&diff=1757Life rafts2008-08-11T04:55:26Z<p>204.14.248.131: /* Givens Buoy Raft */</p>
<hr />
<div>With any new design there is a chance of having a problem. If your life is on the line, a life raft is a good backup plan. A simple life raft will get blown over in big waves and high winds. There are designs that work much better than the simple life raft.<br />
<br />
== Givens Buoy Raft ==<br />
The [http://www.givensliferafts.com/html/liferafts.htm Givens life raft] uses water ballast so wind gusts and breaking waves don't tip it over. They have a testimonial of some guys that [http://www.givensliferafts.com/html/survivors.htm survived 48 hours in a hurricane], including passing through the eye. The water ballast also makes the raft drift much slower in the wind, so rescuers don't have to look so far. This design looks far safer than a simple open raft. There are <br />
[http://www.givensliferafts.com/html/products/deluxerafts.htm life rafts for 4, 6, 8, 10, 12, or 25 people]. An 8 person Givens raft [http://www.seasurvival.com/html/raftorder.html costs $5,295 US].<br />
<br />
==Winslow Life Raft==<br />
<br />
The [http://www.winslowliferaft.com/raft_category.asp?raft_cat_id=2&fromPop=0&page=home Winslow Life Rafts] include models designed for open ocean. Prices are similar to Givens.<br />
<br />
==Free fall lifeboats==<br />
<br />
People can enter from the back and then they drop into the ocean. If things are looking bad for the main ship people can get into the lifeboat and wait to see if the problem can be fixed or if the ship is going to sink. Once in the lifeboat they can launch at any moment.<br />
<br />
<youtube v="unnovzCTtY4" /><br />
<br />
<br />
<youtube v="n-XKljL2nQ4" /><br />
<br />
In another video you can see [http://videodigs.com/mechanics/1700_TEU_Container_Ship_Test_of_Free-Fall_Life_Boat the inside of the boat]. Seats face backward.<br />
<br />
Can see [http://www.norsafe.no/index.php?aid=1334 product info at norsafe.no].<br />
<br />
==Stuff to have in lifeboat==<br />
<br />
* Sea Anchor - to keep bow pointed into waves<br />
* Water maker - if you can make water you last out a storm<br />
* Food<br />
* EPIRB - emergency radio beacon<br />
* GPS - to know where you are<br />
* Kite - so after things calm down some you can go where you want<br />
<br />
==Links==<br />
* [http://en.wikipedia.org/wiki/Life_raft wikipedia on life rafts]</div>204.14.248.131https://wiki.seasteading.org/index.php?title=Scale_models&diff=1754Scale models2008-08-10T20:31:28Z<p>204.14.248.131: /* External links on scale modeling */</p>
<hr />
<div>Scale models for engineering studies can help evaluate seastead designs. <br />
<br />
Basically if you scale dimensions down by 25 and speed down by 5 things will happen at the same relative fraction of hull speed. If wave heights and wave lengths are scaled by 25 then wave speeds are also down by 5. So things work out well. However, in the model everything is happening 5 times faster. So if you see something tip back and forth every 2 seconds in the model it would be every 10 seconds in the full sized version. A 10 knott wind in the model is like a 50 knott wind in full scale. The important relationship between 25 and 5 is that 5 is the square-root of 25. Works for other numbers with this important relationship too.<br />
<br />
<br />
== External links on scale modeling ==<br />
* [http://en.wikipedia.org/wiki/Similitude_%28model%29 Wikipedia Similitude (model)]<br />
* [http://en.wikipedia.org/wiki/Similitude_of_ship_models Wikipedia Similitude of ship models]<br />
* [http://en.wikipedia.org/wiki/Ship_model_basin Wikipedia Ship model basin]<br />
* [http://en.wikipedia.org/wiki/Response_amplitude_operator Wikipedia Response amplitude operator]<br />
* [http://en.wikipedia.org/wiki/Port_Revel_Shiphandling_Training_Centre Wikipedia Port Revel Shiphandling Training Centre]<br />
<br />
==Related==<br />
* [http://en.wikipedia.org/wiki/Ship_motions Wikipedia Ship motions]<br />
* [http://en.wikipedia.org/wiki/Seakeeping Wikipedia Seakeeping]<br />
* [http://en.wikipedia.org/wiki/Ship_stability Wikipedia Ship stability]<br />
<br />
<br />
==Computer modeling==<br />
* [http://www.ultramarine.com/hdesk/runs/samples/ves_mod/doc.htm Ultramarine on boat modeling]<br />
*[http://seasteading.org/interact/forums/research/distributed-research-projects/working-with-blender-simulate-fluid-dynamics- blender]</div>204.14.248.131https://wiki.seasteading.org/index.php?title=Scale_models&diff=1753Scale models2008-08-10T20:30:45Z<p>204.14.248.131: /* External links on scale modeling */</p>
<hr />
<div>Scale models for engineering studies can help evaluate seastead designs. <br />
<br />
Basically if you scale dimensions down by 25 and speed down by 5 things will happen at the same relative fraction of hull speed. If wave heights and wave lengths are scaled by 25 then wave speeds are also down by 5. So things work out well. However, in the model everything is happening 5 times faster. So if you see something tip back and forth every 2 seconds in the model it would be every 10 seconds in the full sized version. A 10 knott wind in the model is like a 50 knott wind in full scale. The important relationship between 25 and 5 is that 5 is the square-root of 25. Works for other numbers with this important relationship too.<br />
<br />
<br />
== External links on scale modeling ==<br />
* [http://en.wikipedia.org/wiki/Similitude_%28model%29 Wikipedia Similitude (model)]<br />
* [http://en.wikipedia.org/wiki/Similitude_of_ship_models Wikipedia Similitude of ship models]<br />
* [http://en.wikipedia.org/wiki/Ship_model_basin Wikipedia Ship model basin]<br />
* [http://en.wikipedia.org/wiki/Response_amplitude_operator Wikipedia Response amplitude operator]<br />
* [http://en.wikipedia.org/wiki/Port_Revel_Shiphandling_Training_Centre Port Revel Shiphandling Training Centre]<br />
<br />
==Related==<br />
* [http://en.wikipedia.org/wiki/Ship_motions Wikipedia Ship motions]<br />
* [http://en.wikipedia.org/wiki/Seakeeping Wikipedia Seakeeping]<br />
* [http://en.wikipedia.org/wiki/Ship_stability Wikipedia Ship stability]<br />
<br />
<br />
==Computer modeling==<br />
* [http://www.ultramarine.com/hdesk/runs/samples/ves_mod/doc.htm Ultramarine on boat modeling]<br />
*[http://seasteading.org/interact/forums/research/distributed-research-projects/working-with-blender-simulate-fluid-dynamics- blender]</div>204.14.248.131https://wiki.seasteading.org/index.php?title=Energy_Storage&diff=404Energy Storage2008-05-30T02:16:52Z<p>204.14.248.131: /* Compressed air energy storage */</p>
<hr />
<div>For now, the most mature technology for storing energy appears to be electrochemical batteries. While they are expensive, the alternatives (flywheels, ultracapacitors, redox batteries, creating hydrogen to power fuel cells) are generally still experimental. However, redox batteries are rapidly approaching usefulness.<br />
<br />
[http://seasteading.org/seastead.org/commented/paper/infra.html#Power The book] covers these technologies extensively.<br />
<br />
== Potential energy ==<br />
<br />
With miles of ocean below it is possible to store significant [http://en.wikipedia.org/wiki/Potential_energy potential energy] with a weight on a rope. Lowering the weight generates energy and you put energy in by lifting it up. The motor/generator from a hybrid car could be used.<br />
<br />
== Compressed air energy storage ==<br />
<br />
Normally [http://en.wikipedia.org/wiki/Compressed_air_energy_storage CAES] uses expensive tanks to store the compressed air. One can instead use the high pressure of the deep ocean to let you store compressed air in a cheap bag. Here the main cost are the hose or pipe to take the compressed air down to the bag and a method to hold the bag down.</div>204.14.248.131https://wiki.seasteading.org/index.php?title=Energy_Storage&diff=403Energy Storage2008-05-30T02:12:46Z<p>204.14.248.131: /* Potential energy */</p>
<hr />
<div>For now, the most mature technology for storing energy appears to be electrochemical batteries. While they are expensive, the alternatives (flywheels, ultracapacitors, redox batteries, creating hydrogen to power fuel cells) are generally still experimental. However, redox batteries are rapidly approaching usefulness.<br />
<br />
[http://seasteading.org/seastead.org/commented/paper/infra.html#Power The book] covers these technologies extensively.<br />
<br />
== Potential energy ==<br />
<br />
With miles of ocean below it is possible to store significant [http://en.wikipedia.org/wiki/Potential_energy potential energy] with a weight on a rope. Lowering the weight generates energy and you put energy in by lifting it up. The motor/generator from a hybrid car could be used.<br />
<br />
== Compressed air energy storage ==<br />
<br />
Normally [http://en.wikipedia.org/wiki/Compressed_air_energy_storage CAES] uses expensive tanks to store the compressed air. One can instead use the high pressure of the deep ocean to let you store compressed air in a cheap bag. Here the main cost may be the hose or pipe to take the compressed air down to the bag. You also have to hold the bag down.</div>204.14.248.131https://wiki.seasteading.org/index.php?title=Energy_Storage&diff=402Energy Storage2008-05-30T02:11:13Z<p>204.14.248.131: /* Compressed air energy storage */</p>
<hr />
<div>For now, the most mature technology for storing energy appears to be electrochemical batteries. While they are expensive, the alternatives (flywheels, ultracapacitors, redox batteries, creating hydrogen to power fuel cells) are generally still experimental. However, redox batteries are rapidly approaching usefulness.<br />
<br />
[http://seasteading.org/seastead.org/commented/paper/infra.html#Power The book] covers these technologies extensively.<br />
<br />
== Potential energy ==<br />
<br />
With miles of ocean below it is possible to store significant energy with a weight on a rope. Lowering the weight generates energy and you put energy in by lifting it up.<br />
<br />
== Compressed air energy storage ==<br />
<br />
Normally [http://en.wikipedia.org/wiki/Compressed_air_energy_storage CAES] uses expensive tanks to store the compressed air. One can instead use the high pressure of the deep ocean to let you store compressed air in a cheap bag. Here the main cost may be the hose or pipe to take the compressed air down to the bag. You also have to hold the bag down.</div>204.14.248.131https://wiki.seasteading.org/index.php?title=Energy_Storage&diff=401Energy Storage2008-05-30T02:07:47Z<p>204.14.248.131: </p>
<hr />
<div>For now, the most mature technology for storing energy appears to be electrochemical batteries. While they are expensive, the alternatives (flywheels, ultracapacitors, redox batteries, creating hydrogen to power fuel cells) are generally still experimental. However, redox batteries are rapidly approaching usefulness.<br />
<br />
[http://seasteading.org/seastead.org/commented/paper/infra.html#Power The book] covers these technologies extensively.<br />
<br />
== Potential energy ==<br />
<br />
With miles of ocean below it is possible to store significant energy with a weight on a rope. Lowering the weight generates energy and you put energy in by lifting it up.<br />
<br />
== Compressed air energy storage ==<br />
<br />
Normally [http://en.wikipedia.org/wiki/Compressed_air_energy_storage CAES] uses expensive tanks to store the compressed air. One can instead use the high pressure of the deep ocean to let you store compressed air in a cheap bag. Here the main cost may be the hose or pipe to take the compressed air down to the bag.</div>204.14.248.131https://wiki.seasteading.org/index.php?title=Communications&diff=275Communications2008-05-29T14:23:02Z<p>204.14.248.131: /* External */</p>
<hr />
<div>== Internal ==<br />
<br />
'''Wireless phone system -'''<br />
GSM/Bluetooth/WIFI accesspoints feeding into a PBX such as Asterisk.<br />
<br />
'''Paging system -''' <br />
"Smart system" where everyone wears a transponder so the communications system knows where to page/ring you?<br />
<br />
'''Fire/Life Safety systems''' - Detection and Warning<br />
<br />
'''Entertainment -''' Internal Fiberoptic network to move large quantities of data - movies, etc? Cable TV analog<br />
<br />
== External ==<br />
<br />
'''Satellite Communications''' Satcomms could cover phone, internet and TV. Our current provider at my 'remote location' is all SatBased to the UK. We have a sat Modem, and on the London end our VOIPS connect to a call manager and Public Internet\Phone is provided in this way as well. Costs about 60k a year for a very well sustained (no double sale of bandwidth) 4mb up/dn and can serve 300 people easily. The price of this will come down as the technology for Seasteading goes up.<br />
<br />
'''Internet'''<br />
<br />
'''Phone -''' HF Radio using PPP with VOIP/IAX2/MELPe would be extremely cumbersome to setup, but is doable (might require bonding which makes it even crazier). MELPe is a military codec operating at 600/1200/2400 bps. With PPP/IAX2 you have very little networking overhead. The quality of MELP is hard to describe, but with carefully tweaked jitterbuffer settings, cell phone quality should be possible. The advantage is that you avoid the annoying lag. This setup would require an extremely hacked Asterisk.<br />
<br />
<br />
'''Satellite Entertainment''' TV/Radio<br />
<br />
Multiple dishes?<br />
<br />
'''High Frequency Radio''' - 2-30MHz<br />
<br />
Worldwide Coverage, very large antennas (30+ meters long, or longer?)<br />
<br />
'''Troposcatter''' [http://en.wikipedia.org/wiki/Troposcatter Over the horizon communications]<br />
<br />
Range is something like 100 to 1200 miles. [http://goliath.ecnext.com/coms2/gi_0199-5769172/RADYNE-TROPOSCATTER-MODEMS-BREAK-NEW.html Data rate to 40 Mbps]<br />
<br />
Possible 'Pirate' Radio Station(s)?<br />
<br />
'''GMDSS System''' <br />
Global Maritime Distress Signal System, SOLAS requirement<br />
<br />
'''VHF-FM Radio Marine Band 156-158 MHz'''<br />
SOLAS requirements to maintain a listening watch on distress frequencies<br />
<br />
Coordinate small boat activities around SeaStead, each small boat equipped with one of these too. <br />
<br />
Relatively small radios, low power (~25w ERP), small antennas (2 meters or less in length, max. Handhelds ~8" long)<br />
<br />
'''VHF-AM Radio Aircraft Band 118-136MHz'''<br />
<br />
Coordinating air traffic inbound and outbound.<br />
<br />
Several frequencies: Departure/Approach, Tower (landing), Ground (ground movement), coordination frequencies<br />
<br />
Air Traffic Control radar<br />
<br />
Air Navigation aids? [http://en.wikipedia.org/wiki/VHF_omnidirectional_range VOR]/[http://en.wikipedia.org/wiki/Distance_measuring_equipment DME]/ [http://en.wikipedia.org/wiki/TACAN TACAN] or rely on [http://en.wikipedia.org/wiki/GPS GPS]?<br />
<br />
<br />
'''Tactical Radios - Trunked 800 MHz systems'''? Used for: <br />
<br />
Firefighting / EMS<br />
<br />
Maintenance<br />
<br />
Defense<br />
<br />
Law Enforcement?<br />
<br />
Need to investigate frequency propagation through structures. <br />
<br />
<br />
'''Other radios''' - Ability to monitor/speak on military frequencies, ie <br />
<br />
30-70 MHz FM (Military Tactical Net);<br />
<br />
220-400 MHz AM (Military aviation band), etc?<br />
<br />
"Company" radios for SeaStead operations, similar to business-band frequencies (VHF-FM High at 150MHz or UHF-FM at 450-470MHz and/or [http://en.wikipedia.org/wiki/Trunked_radio_system 800 MHz trunked system]. Will probably require robust encryption.</div>204.14.248.131https://wiki.seasteading.org/index.php?title=Communications&diff=274Communications2008-05-29T14:22:02Z<p>204.14.248.131: </p>
<hr />
<div>== Internal ==<br />
<br />
'''Wireless phone system -'''<br />
GSM/Bluetooth/WIFI accesspoints feeding into a PBX such as Asterisk.<br />
<br />
'''Paging system -''' <br />
"Smart system" where everyone wears a transponder so the communications system knows where to page/ring you?<br />
<br />
'''Fire/Life Safety systems''' - Detection and Warning<br />
<br />
'''Entertainment -''' Internal Fiberoptic network to move large quantities of data - movies, etc? Cable TV analog<br />
<br />
== External ==<br />
<br />
'''Satellite Communications''' Satcomms could cover phone, internet and TV. Our current provider at my 'remote location' is all SatBased to the UK. We have a sat Modem, and on the London end our VOIPS connect to a call manager and Public Internet\Phone is provided in this way as well. Costs about 60k a year for a very well sustained (no double sale of bandwidth) 4mb up/dn and can serve 300 people easily. The price of this will come down as the technology for Seasteading goes up.<br />
<br />
'''Internet'''<br />
<br />
'''Phone -''' HF Radio using PPP with VOIP/IAX2/MELPe would be extremely cumbersome to setup, but is doable (might require bonding which makes it even crazier). MELPe is a military codec operating at 600/1200/2400 bps. With PPP/IAX2 you have very little networking overhead. The quality of MELP is hard to describe, but with carefully tweaked jitterbuffer settings, cell phone quality should be possible. The advantage is that you avoid the annoying lag. This setup would require an extremely hacked Asterisk.<br />
<br />
<br />
'''Satellite Entertainment''' TV/Radio<br />
<br />
Multiple dishes?<br />
<br />
'''High Frequency Radio''' - 2-30MHz<br />
<br />
Worldwide Coverage, very large antennas (30+ meters long, or longer?)<br />
<br />
'''Troposcatter''' Over the horizon communications [http://en.wikipedia.org/wiki/Troposcatter Wikipedia]<br />
<br />
Range is something like 100 to 1200 miles. [http://goliath.ecnext.com/coms2/gi_0199-5769172/RADYNE-TROPOSCATTER-MODEMS-BREAK-NEW.html Data rate to 40 Mbps]<br />
<br />
Possible 'Pirate' Radio Station(s)?<br />
<br />
'''GMDSS System''' <br />
Global Maritime Distress Signal System, SOLAS requirement<br />
<br />
'''VHF-FM Radio Marine Band 156-158 MHz'''<br />
SOLAS requirements to maintain a listening watch on distress frequencies<br />
<br />
Coordinate small boat activities around SeaStead, each small boat equipped with one of these too. <br />
<br />
Relatively small radios, low power (~25w ERP), small antennas (2 meters or less in length, max. Handhelds ~8" long)<br />
<br />
'''VHF-AM Radio Aircraft Band 118-136MHz'''<br />
<br />
Coordinating air traffic inbound and outbound.<br />
<br />
Several frequencies: Departure/Approach, Tower (landing), Ground (ground movement), coordination frequencies<br />
<br />
Air Traffic Control radar<br />
<br />
Air Navigation aids? [http://en.wikipedia.org/wiki/VHF_omnidirectional_range VOR]/[http://en.wikipedia.org/wiki/Distance_measuring_equipment DME]/ [http://en.wikipedia.org/wiki/TACAN TACAN] or rely on [http://en.wikipedia.org/wiki/GPS GPS]?<br />
<br />
<br />
'''Tactical Radios - Trunked 800 MHz systems'''? Used for: <br />
<br />
Firefighting / EMS<br />
<br />
Maintenance<br />
<br />
Defense<br />
<br />
Law Enforcement?<br />
<br />
Need to investigate frequency propagation through structures. <br />
<br />
<br />
'''Other radios''' - Ability to monitor/speak on military frequencies, ie <br />
<br />
30-70 MHz FM (Military Tactical Net);<br />
<br />
220-400 MHz AM (Military aviation band), etc?<br />
<br />
"Company" radios for SeaStead operations, similar to business-band frequencies (VHF-FM High at 150MHz or UHF-FM at 450-470MHz and/or [http://en.wikipedia.org/wiki/Trunked_radio_system 800 MHz trunked system]. Will probably require robust encryption.</div>204.14.248.131https://wiki.seasteading.org/index.php?title=Communications&diff=273Communications2008-05-29T14:19:34Z<p>204.14.248.131: /* External */</p>
<hr />
<div>== Internal ==<br />
<br />
'''Wireless phone system -'''<br />
GSM/Bluetooth/WIFI accesspoints feeding into a PBX such as Asterisk.<br />
<br />
'''Paging system -''' <br />
"Smart system" where everyone wears a transponder so the communications system knows where to page/ring you?<br />
<br />
'''Fire/Life Safety systems''' - Detection and Warning<br />
<br />
'''Entertainment -''' Internal Fiberoptic network to move large quantities of data - movies, etc? Cable TV analog<br />
<br />
== External ==<br />
<br />
'''Satellite Communications''' Satcomms could cover phone, internet and TV. Our current provider at my 'remote location' is all SatBased to the UK. We have a sat Modem, and on the London end our VOIPS connect to a call manager and Public Internet\Phone is provided in this way as well. Costs about 60k a year for a very well sustained (no double sale of bandwidth) 4mb up/dn and can serve 300 people easily. The price of this will come down as the technology for Seasteading goes up.<br />
<br />
'''Internet'''<br />
<br />
'''Phone -''' HF Radio using PPP with VOIP/IAX2/MELPe would be extremely cumbersome to setup, but is doable (might require bonding which makes it even crazier). MELPe is a military codec operating at 600/1200/2400 bps. With PPP/IAX2 you have very little networking overhead. The quality of MELP is hard to describe, but with carefully tweaked jitterbuffer settings, cell phone quality should be possible. The advantage is that you avoid the annoying lag. This setup would require an extremely hacked Asterisk.<br />
<br />
<br />
'''Satellite Entertainment''' TV/Radio<br />
<br />
Multiple dishes?<br />
<br />
'''High Frequency Radio''' - 2-30MHz<br />
<br />
Worldwide Coverage, very large antennas (30+ meters long, or longer?)<br />
<br />
'''Troposcatter''' Over the horizon communications <ref>http://en.wikipedia.org/wiki/Troposcatter</ref><br />
<br />
Range is something like 100 to 1200 miles. Datarate to 40 Mbps. <ref>http://goliath.ecnext.com/coms2/gi_0199-5769172/RADYNE-TROPOSCATTER-MODEMS-BREAK-NEW.html</ref><br />
<br />
Possible 'Pirate' Radio Station(s)?<br />
<br />
'''GMDSS System''' <br />
Global Maritime Distress Signal System, SOLAS requirement<br />
<br />
'''VHF-FM Radio Marine Band 156-158 MHz'''<br />
SOLAS requirements to maintain a listening watch on distress frequencies<br />
<br />
Coordinate small boat activities around SeaStead, each small boat equipped with one of these too. <br />
<br />
Relatively small radios, low power (~25w ERP), small antennas (2 meters or less in length, max. Handhelds ~8" long)<br />
<br />
'''VHF-AM Radio Aircraft Band 118-136MHz'''<br />
<br />
Coordinating air traffic inbound and outbound.<br />
<br />
Several frequencies: Departure/Approach, Tower (landing), Ground (ground movement), coordination frequencies<br />
<br />
Air Traffic Control radar<br />
<br />
Air Navigation aids? [http://en.wikipedia.org/wiki/VHF_omnidirectional_range VOR]/[http://en.wikipedia.org/wiki/Distance_measuring_equipment DME]/ [http://en.wikipedia.org/wiki/TACAN TACAN] or rely on [http://en.wikipedia.org/wiki/GPS GPS]?<br />
<br />
<br />
'''Tactical Radios - Trunked 800 MHz systems'''? Used for: <br />
<br />
Firefighting / EMS<br />
<br />
Maintenance<br />
<br />
Defense<br />
<br />
Law Enforcement?<br />
<br />
Need to investigate frequency propagation through structures. <br />
<br />
<br />
'''Other radios''' - Ability to monitor/speak on military frequencies, ie <br />
<br />
30-70 MHz FM (Military Tactical Net);<br />
<br />
220-400 MHz AM (Military aviation band), etc?<br />
<br />
"Company" radios for SeaStead operations, similar to business-band frequencies (VHF-FM High at 150MHz or UHF-FM at 450-470MHz and/or [http://en.wikipedia.org/wiki/Trunked_radio_system 800 MHz trunked system]. Will probably require robust encryption.<br />
<br />
== References ==<br />
<br />
{{Reflist}}</div>204.14.248.131https://wiki.seasteading.org/index.php?title=Accessible&diff=272Accessible2008-05-29T13:53:09Z<p>204.14.248.131: </p>
<hr />
<div>Like small islands everywhere, a floating country will need supply ships on a regular basis. There must be a way to transfer people and cargo from the supply ships to the structure(s). It is alright if we can not transfer things during a storm and have to wait till the weather clears. We should always have enough food to last an extra week.</div>204.14.248.131