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.   






Please used Froude scaling rules to give me the dimensions of a 1:10.5 scale model in inches.
Also give me the total target weight of the scale  model in lbs.


We will test this in Sandy Hill Bay, Anguilla.  
We will either tie it to a mooring or have a human hold a line to keep it from moving, maybe using stretchy line to be
sure it only has a gentle force from this.
By where in the bay we position the model we can test under different wave heights.
To simulate 3 foot, 5 foot, and 8 foot waves what scale height in inches should we try to find?

Are there apps for an Android phone that we could use to record velocity/acceleration/jerk  
and pitch/roll/heave of the scale model?  Which would you recommend for monitoring our scale model in waves?

What sort of accelerations in the scale model will correspond with plates starting to slide around on a table 
in a full scale version?  What other metrics of acceleration could we use to get an idea from the numbers on
the model what the full scale would be like?

I am thinking of putting a glass with a few rocks and filled with water so video can record how much the water tips
around in the cup.

We will have a long wooden pole with marks on it that is either pounded into the sand or tied to a weight on the bottom
to measure wave heights.

If we put some dolls on to give someone watching the video a sense of scale, how many inches tall should the
dolls be?

How deep should the water be so we are simulating "deep water waves" and not steeper waves near shore?

We will have a main camera will be mounted on a tri-pod on shore (fixed ground) and with a zoom lens so it has good detail of experiment.
This camera will shoot at a higher frame rate so we can slow down the video based on Froude scaling of time.
This will let us analyze how much the model heaves or tips using part of the model to get the scale.
We have done this with past models and been very happy with the results.

A second camera, maybe a go-pro, may be on the model to give a sort of "first person view" from the seastead which might
let a viewer really feel how much the tipping would be (video also slowed by Fraude scaling).  The GoPro also
records accelerations.

Are there other ways of measuring the results of the scale model that we should consider?