We are working on a seastead design.
The design goals are discussed at http://seastead.ai/ai/seastead.goals.html
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. The two sides will be 80 feet and the back 40 feet wide.
The triangle frame will be a sort of truss structure that also doubles as a 4 foot high railing to keep humans from falling off.
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 floor and roof/ceiling (7 foot inside) the full area of the triangle but only the center 14 feet will be enclosed living space,
the sides will be open porch.  
The living area will have 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 3 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.

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.

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

Centered on outdoor space on 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.
This davit/crane will be shorter, like 6 feet, so it can swing under the roof.




In really high winds the differential thrust will eventually not be sufficient control.  

Think we want "trailing drogue on a sliding bridle" or "drogue with adjustable bridle".
We will have a winches at the two back corners each with ropes going out to the drogue.
Then you can let out or in either winch to adjust things.
This lets us adjust the angle the drogue will aim the seastead off of directly downwind. 
How far a range to the left and right of downwind do
you think it could get?  The 3 legs will act like giant keels or daggerboards
and mostly we will move in the direction they are pointing.   With this it seems like we could have
reasonable control even in rather bad situations.  How well do you think this would work?

We would like to move like 6 knotts even with drogue out so we can try to get out of the way of the
storm.  What size drogues would be good for that kind of speed in 30, 40, 50, and 60 mph winds?

It would be best to have a system where we could adjust the drogue drag level on the fly.
Something like the Jordan Series Drogue could be interesting if we could pull in the 
collapse line to disable some or let it out more to enable more of the cones.
Is this in the right range for our needs?  Or is there something like this that is
adjustable and in the right range for our application?