The Seasteading Institute

Reply To: OCEANOPOLIS

[quote=OCEANOPOLIS]

Mainly, calculus of stability letter. http://en.wikipedia.org/wiki/Metacenter#Metacenter.

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Well, not really. Im not counting on my center of buoyancy moving: it does, a little, but doing so means a big enough wave can flip you over. Im aiming to have my center of gravity strictly below the center of gravity. Maybe im making things needlessly hard on myself, but better safe than sorry. Taking this into account, the natural period of osciltion would undoubtly go down, but without a doubt not enough to have a big enough band-gap with 10s period waves.

Wayne: natural frequency can be caclulated by considering the whole as a torsion spring. The only thing you need are righting-moment and moment of inertia: i cant be arsed to calculate the latter by hand, i let Solidworks do that for me.

Direct information on costs are extremely hard to find. Its not like retail, where they advertize their prices. Every price is negotiated, so they arnt going to make any claims upfront.

I found this link usefull:

http://www.cement.org/water/dams_rs_cost.asp

Bid tabulations from several RCC dam projects completed after 2003 show that the unit cost of in-place RCC approximately ranges from $75 to $142 per yd³(from $98 to $186 per m³). This unit cost includes cost of materials, mixing, transporting, placing and curing. It is based on reported bid prices of successful bidders. For detailed cost information on eight recent projects, click here.