We are working on a seastead design that will have a 40 by 16 foot living area above the water.
There will be 4 foot diameter legs/floats/columns that are about 24 feet long going out from 
from the 4 corners of living area and down into the water at 45 degrees, with half of
each column under water.   The legs/floats/columns will probably be made from 1/4 inch
thick duplex stainless steel on the sides and 1/2 inch thick on the dished ends.
They will have some modest pressure like 10 psi inside.

The bottoms of the floats will make a rectangle about 50 feet wide and 74 long.
From the bottom of each leg there will be 2 cables going to the adjacent corners.
The boyancy force is lifting up and the leg pushing against the platform leaves an outward
force that the 2 cables pulling in counter, so the leg ends up staying in place.
There will also be a cable making a rectangle between the bottoms of all the legs so we have some
redundancy in case one cable breaks.
The seastead is about 36,000 lbs I think but this is NOT a normal boat hull shape,
it is more like a tiny oil platform as far as drag.

We expect to use 4 low speed submersible mixers with 2.5 meter diameter propellers as 
thrusters, one on each leg/float.  There will be lots of solar and battery.
This should move at around 0.5 to 1 MPH plus any help from careful use of eddies and currents.





Imagine we change the body to one that is made from a 12 foot diameter round corrugated culvert 60 feet long, closed at both ends.
Then imaging it is about 8 feet above the water and with the 4 legs each with a submersible mixer as a thruster.
Each of the 4 thrusters has a 2.5 meter propeller and does 720 lbs thrust at full 3.2 kw power but more efficient at lower power levels.

What I would like you to try to analize is if we wanted to use the body as a sort of sail or kite how well this might work.
The idea is we could use the  submersible mixer/thrusters not to move forward but just to keep the body at a certain 
angle toward the wind to get some useful thrust from the wind, using the body sort of like a kite or sail.
We might go downwind, or somewhat to the right or left of downwind, for less electricity or faster than just using the 
electric thursters for movement.

Please try to estimate if we had 20 MPH wind in the Caribbean the following:

1)  Are the thrusters able to hold whatever orientation we want?  What sort of power would they need?
2)  How fast would the wind blow it sideways if it was broadside to the wind?
3)  If we wanted to go 20 or 30 degrees to the right or left of downwind how well would that work?