My design goals are a platform that is very stable, solar powered, and can move around slowly. I would also like all the parts to be able to ship in one 40 foot container. I have made a 1/6 scale model of seastead platform that fits in 40 foot container. With solar and small electric motors the owner will not need the high level of skill needed for sailing or maintaining diesel engines. We want a slow gentle motion that is easy for beginners and older folks to handle. So this is the goal.
I like the idea of low speed mixers as thrusters. The thrusters have large propellers, like 6 feet, that turn slowly. The motors are like 6 Hp but the thrust can be over 1000 lbs. So the electricity is low enough to be powered by solar. See here, or here. These have lots of thrust but since they turn slow the top speed may only be 2 or 3 MPH. But the power use is low enough that solar could drive these all day long. In the Caribbean you could usually get to another country in a day. If you are playing on the Internet you probably don't care how long it takes anyway. But when moving slow on the ocean you must take extra care to get enough stability to be comfortable.
For beams and legs I am thinking of using Titanium. It does not rust in seawater. Sea-life growing on it can not harm it. The price has come down to where it seems a reasonable choice.
For floats I am thinking boat or ship bumpers standing on end. Maybe 3 or 4 feet in diameter and 12 to 16 feet long.
At the end of each leg will be some kind of "Heave Plate" so it does not go up too fast. This could be like a 6 foot by 6 foot flat plate of metal or maybe dished ends, tank heads, or half spheres. Details to be worked out.
Compared to a boat the floats on their ends have a small-waterline-area. The structure could be like 80 feet across, so even if one side goes up a few feet the tilt angle will not be much. With some kind of flopper stopper it may not even go up 2 feet in a 6 foot wave. So it could be very stable in Caribbean waves.
Bitcoin or Lightning Crowdfunding contributions appreciated.
Some more info at islandboys.ai. We made a video talking about a quadmaran solar model we did in 2015
Need to solve the issue of building and launching. Need to work out how we put it together and get it into the water.
I went FAD fishing in Anguilla. Seastead drifting along would be natural Fish Aggregating Devices.
If you release some small quantity of nutrients you can get a large quantity of algae and then a large quantity of small fish. This should be a much more efficient method of attracting fish than the usual "chum" method. Seasteads drifting along would be perfect for working out how to do this. I have some ideas for initial experiments to investigate this. It will be much easier once we have a seastead.
I think we can help with pitch stability by using 4 propellers and so like that idea.