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 wide 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, which half of
each column under water.   The bottoms of the floats will make a rectangle about 50 feet wide and 74 long.
From the bottom of each column there will be 
2 cables going to the adjacent corners to hold it in place.
There will also be a cable making a rectangle between the bottoms of all the floats 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 2.5 meter diameter propellers on two low speed submersible mixers and solar power to move
at around 0.5 to 1 MPH plus any help from careful use of eddies.


This is NOT a normal boat hull shape, it is more like a tiny oil platform as far as drag.
Motion on a boat is just "buoyancy-dominated" but we suspect this is "drag-dominated" like a spar or semi-sub.

Assume about 3,000 lbs for each of the 4 legs and 6,000 lbs for the frame around the edge of the 40 by 16 living area.
We will try to put heavy things like batteries or water/waste tanks near the corners to increase rotational innertia.
The rest of the weight can be evenly through the living area.

We are hoping that this has a "small waterplane area" and so a softer more comfortable ride
than a normal catamaran or monohul of comparable living space but we want you to try
to run some numbers and see what you find.

The hope is that the seastead legs being 4 foot diameter and well into the water should have a lot
of rotational inertia and also drag through the water to slow/damp pitch/roll/heave motions compared to typical boats.
For the seastead to roll the legs have to move sideways through the water which seems has to be slow.

Please make a table comparing this design to a 50  foot catamaran  and a 60 foot monohul
for some of the following and any others you think could help illustrate the differences..


1) In general how "lively" will it be?
2)  what weights are you using for the catamaran and monohul?
3)  waterplane area
4)  heave natural  period
5)  roll natural period
6)  foll innertia


For Caribbean waves of these heights estimate heave, pitch, roll, acceleration, jerk (rate of change of acceleration):
    3 foot
    5 foot
    8 foot

Please discuss things like walking, eating, cooking and sleeping on the 3 vessels.