We are working on a seastead design.

Above the water there will be a big triangle frame.  The
left and right sides will be 70 feet long and the back part of the triangle will be 35 feet wide.
The point opposite the 35 ft side is the front.
The triangle frame will be a truss structure that is 7 feet high (floor to ceiling).
It will be enclosed and the whole inside the living area.  Lots of glass to see out.

There are 3 legs/floats/foils/wings that provide the buoyancy, so it is a bit like a trimaran but with a very soft ride.
Each leg/wing will 19 feet long and have a NACA 0030 foil shape with 10 foot chord and 3 foot width.
Each of the 3 legs will be attached to the underside of the big triangle near one of the 3 points (but the total top of the
leg will be inside the triangle) and going down so that the lower half is in the water.
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.
The 3 legs will all be parallel with the blunt or "leading edge of the wing" side facing forward so it is low drag 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 the top half of the front of each leg, so the top half that is out of the water, will be a built in ladder.

There will be 6 RIM drive thrusters of 1.5 foot diameter, one on each side of the 3 legs/wings about 3 feet up from the bottom.
These RIM drives will have the flat sides toward the front and back of the seastead.

On top of the roof there will be solar all over.

Behind the back near the center will be two supports going out and 2 ropes going down to a dinghy.
The dinghy is a 14 foot RIB boat with an electric Yamaha HARMO outboard.  It is sideways against the center of the backside of the living area.
When the seastead is moving forward the dingy is shielded from the wind by the living area.
Also behind the back on the left and right of the dinghy will be a deck that is 5 feet wide extending beyond the back of the triangle.

There are 3 stabilizers that look like a little airplanes, one attached near the back of each main seastead leg.  
The little airplane has a 12 foot wing-span, 1.5 foot chord, the body 6 feet long, and the elevator has a 2 foot wing-span and 6 inch chord. 
A small actuator makes the elevator angle up or down so it can adjust the angle of 
attack of the main wing of this stabilizer without needing a large actuator.
This is really the "servo tab" idea.
While the thick part of the leg is 3 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 a notch into the front/center of the wing only has to go about 25% of the chord of the wing.

When the seastead is going to be staying in one place for awhile, we can put down 3 helical mooring screws and give the seastead tension legs 
so it becomes nearly stationary when parked.

Two seasteads will be able to connect together with a walkway, one behind the other, so that while underway 
people can move between seasteads, enabling a real community.   





We want to have a trailer hitch ball, or maybe a pintel hitch, at the front and back center of each seastead that we 
can install a rope bridge that goes between 2 seasteads.

There will be a rope bridge that can be installed between two seasteads using a
hitch on each one so one person at a time could go between the seasteads.
It can also just be used to tow a seastead that has had trouble.

Imagine we have two hand rail ropes that are taking the tension and then suspended below
them a third rope for walking on.  The end of the hand rail ropes will have a metal triangle with
one point having a hitch connection to connect to the seastead and the opposite 
side keeping the two ropes apart with one rope attached to each of the other two points on 
the metal triangle. 

Imagine a single 250 lbs person is on center of this 40 foot rope bridge.  How much sag is
there if there is 2500 lbs total tension?  How much if 1000 lbs total tension?

Imagine the 4 motors in front seastead are thrusting at 750 lbs each for a total of 3000 lbs and 
the motors on the seastead in back are off.  The two seasteads have the same amount drag so
half the thrust will be used up on each, or 1500 lbs on each.  If the second seastead has
1500 lbs of drag and the pull is coming from the rope bridge then the tension on the rope bridge
is 1500 lbs.

How hard would it be to send 6000 watts of power from the following seastead to the leading seastead?
How do we do it so it does not try to send far more than 6000 watts?  What would it cost for
all the stuff needed?

Instead of sending power from the back one to the front we could just have a very small
tension normally, like 300 lbs, and then when someone is on the bridge it could be increased
to 2000 lbs or something.  We could have a light/laser beam that someone breaks when they 
walk onto the bridge, or a button they push before going on, or a security camera with AI
that can tell when someone is going on the bridge.  This way only for brief periods 
would the front seastead have to use much more power than the back to have high tension.
How would you recommend doing this?


Imagine we want the rope bridge to be made out of Nylon so it has plenty of stretch in case a wave
pulls on one seastead before the other and we want it to have 15,000 lbs break strength.  How much
do you think it would weigh?   How much do you think it would cost?

What size trailer hitch or pintel hitch would be rated for 15,000+ lbs?


If one person attaches one end of the bridge to the hitch on his seastead and then takes a lead line
and walks down the float on his seastead while someone on the other seastead walks down the stairs
on the leg on his seastead the two people should be within rope throwing distance.   After the
second guy catches the lead rope he can pull up his end of the bridge and attach it to the hitch
on his seastead.  Then the front seastead can start pulling on the brige to give it the tension.
It probably is not too hard to setup.  Once there people can go back and forth between the 
two seasteads.   Probably this works for 3 or 4 connected together in moderate waves, right?
So you could have a real seastead community.
The people setting up the seastead should probably have a safety rope attached to them before they 
they walk down the legs and work on setting up the bridge.

I have some land by a rocky shore in Anguilla where I think it is deep enough for the seastead just
30 feet out.  If I had a concrete fixture on shore with the right kind of hitch for the rope bride
it may be reasonable to connect the bridge between the seastead and shore.  The wind is blowing away
from shore so the natural inclination would be for the seastead to be pulling on the bridge if it
were connected to shore at this spot.


Try to draw an image with two seasteads and rope bridge like the above between them.