We are making scale models of different seastead design ideas.
Many of these ideas have tensegrity structures where the living area is above the
water and a float/leg goes partway down into the water.

We have a mold for making scale model floats that is trying to approximate a wing shape.
The leading edge of the wing was made from cutting a 3.5 foot piece of 4 inch PVC pipe in half lenghtwise.
I measured the inside span as 3.75 inches.
Attached to each edge of this are hinges to pieces of plywood 3.5 feet by 16 inches.
We can put in a plastic trash bag as liner, so the foam does not stick to the mold.
After we pour foam in and let it harden the hinges let us swing the wood away from the foam on
both sides and remove the foam.


1) What volume of foam will we need to fill this mold?
   For a 2 part 2 lbs foam how many cups of each part should we mix to get this volume?

2) If the model has 3 wing/legs each 50% in sea water what should the total weight of the model be in lbs?

With Froude scaling rules:

1) If this is for a 1:6 scale model what would the full scale dimensions be?

2) At the full scale what is the mass of displaced seawater if half the wing/float/leg is in the water (in lbs)?
   And the total of 3 such legs?

3) If we have 3 full scale wing/float/legs that are halfway in the water (long way up and dow) how much force in lbs
   would it take to move them at 1, 2, or 3 MPH moving (all parallel and oriented in the low Cd direction of course)?

4) For reasonable assumptions on electrical motors and propellers what sort of watts would it take to
   move these 3 full scale wing/float/legs at 1, 2, or 3 MPH?