unsure...

[BNT77]

well this goes back to my origional question then.

is there a formula for calucalting displacement then?

...i told ya i was bad at math...

 

[MSilvia]

64 lbs x (volume in cubic feet) = weight of displaced saltwater

62.4 lbs x (volume in cubic feet) = weight of displaced freshwater

Is that right Walter?

 

[jonnythan]

BNT77 once bubbled...
well this goes back to my origional question then.

is there a formula for calucalting displacement then?

...i told ya i was bad at math...

The volume of the object is its displacement, provided it doesn't absorb any water. For instance, a 1 cubic foot concrete block will displace 1 cubic foot of water, but a 1 cubic foot sponge will not since it will soak up a lot of water.

What exactly are you trying to do? Give us some specifics and we'll be able to help more.

 

[BNT77]

well its kinda complicated because it involves multiple shapes, some sphered some cylindrical, etc but for example one of the spheres is 25' x 25'

 

[MSilvia]

that does make it complicated.

 

[BNT77]

*lol* thats why im here

 

[Walter]

If you know the dimensions, it's simple algebra to find the volume. There are formulas for sheres, cubes, etc. Just look 'em up and apply them.

 

[MSilvia]

the formulas for the component shapes might be simple, but if you have a cylinder connecting to a sphere, you need to calculate and subtract the overlap in order to get an accurate result, which isn't quite so simple.

 

[BNT77]

exactly...but there is very little overlapping of that sort

hmmmmm

 

[Walter]

Displacement, volume etc. are simple.

More importantly, you need to have an understanding of engineering principles and mathmatics to design such a structure and have any chance of it being safe. I'm pretty good at math and I know such a project is well beyond my ability. Before undertaking this project, I'd want to go back to college for an engineering degree and then get some experience in the field.