We are working on a seastead design.
This is NOT a normal boat hull shape, but it is a bit like a trimaran in that their are 3 floats.



Above the water there will be a big triangle frame, 40 feet on a side.
This could be made with aluminum box beams.
We will call the 3 points on the triangle "front", "left", and "right".
And the edge between left and right we will call "back".

There will be a rectangular living area that is 12 feet wide and as close to the front as it can be 12 feet wide
inside the triangle.  It will extend all the way to the "back".   

The living area will be 8 feet height, with the bottom on top of the rectangular frame above.  Lots of windows in the
font and back and some along the side.    

There will be 3 floats/legs/wings that will be the buoyancy.
Each leg/wing will 19 feet long and have a NACA foil shape with 10 foot chord and 2 foot width.
This makes for a "small waterline area" similar like a small oil platform but one that can move through the water easier because of the foil shape.
Each of the 3 legs will be attached to the underside of the big triangle near one of the 3 points and going down into the water.
The 3 wings will all be parallel with the blunt or "leading edge of the wing" forward  so it is easy for the seastead to move forward.
Each leg will be 50% under the water (so 0.5 * 19 feet) and the top 50% out of the water.
On front of each leg on the top half that is out of the water will be a built in ladder.

Connecting to the bottom of the railing frame will be a netting like on some catamarans.
In the middle of the long side of the living area on both the left and right there will be a door and steps going down to the netting (about 4 feet down).

There will be 6 RIM drive thrusters, one on each side of the legs/wings about 3 feet up from the bottom.
These will be aimed so they can push water past the wing and toward the back of the seastead.

There will be solar on the top of the living area and also on fold down panels on the left and right sides.
In the picture have the fold down panels up and level with the top of the living area.  
The living area is 8 feet high and the fold down panels go out 8 feet.
How many total square feet of solar is this and how many installed watts?

The legs, frame, and living area will be made from Marine aluminum.
How much would you expect the structure to weigh in lbs?
Given the volume of our floats/legs at halfway under water how much extra bouyancy is there, after the structure weight, for everything else?

Centered on the netting to the left side of the living area will be a 14 foot RIB boat with 1 outboard motor.   
On the triangle frame next to the boat will be a davit/crane for loading and unloading the boat.

The above design is already very stable
but I want to look at a possible way to use active stabilizers special for this design to make it even more so.

The stabilizers will looks like a little airplanes and go around the back of each main seastead leg.  
A small actuator will be able to make the tail on this airplane angle up or down so it can adjust the angle of 
attack of the main wing of this stabilizer airplane without the need of a large actuator.
While the thick part of the leg is 1 feet wide the back where the airplane will attach is very thin.  And to get the airplane's
center of lift to balance on the pivot only about notch into about 1/4 of the wing is needed.


What is the additional buoyancy force of an additional foot of water around one of these legs? 
If a stabilizer could reduce 1 foot from the top of a wave and 1 foot off the bottom then it 
could make a 4 foot wave feel about like a 2 foot wave, right?
How big a foil/wing would it take to cut 1 foot off a wave peak or trough at 5 knots?
If we make this out of marine aluminum about how much would you estimate it would cost for the airplane and the small actuator? 
What would it weigh in lbs?
When estimating costs assume a batch of 20 will be made in China.


Please estimate how many watts it will take to go 4, 5, or 6 knots with the legs and stabilizer.
If we had 4000 lbs of LiFePo4 batteries, how many hours and how many miles could we go at each of these speeds on a full charge?
Please estimate how much the stabilizer could take off the crest and trough of each wave and the total felt wave reduction at each speed.
How many Caribbean days would it take on average to charge those batteries?

Now the basic SWATH seastead design means that a 4 foot wave causes much less than 4 feet of movement, and so the active stabilizers
we are really don't have to fight the full wave height.   Try to estimate actual motion for waves 3, 4, 5 feet at different speeds 4, 5, 6 knots.

Assume we want to cross an ocean and so keep moving 24/7 on solar, and we use 1000 watts for non-propulsion systems, how fast could we go?
What if we turned on the stabilizers, how fast could we go 24/7?

Please estimate the total costs for 1 seastead made in China and the cost each if we had a batch of 20 made.