6 Replies Latest reply on Oct 28, 2013 5:52 AM by Tom Fortune

# Centre Of Bouyancy

Hi,

Im a Design Technology student from the UK recently new to solidworks. I am wondering whether its possible to find the centre of bouyancy in solidworks. i am making a floating duck alarm for a swimming pool and need to find out if the weight of the head will cause the product to roll onto its back submerging its electronic components including the solar panel on the top of my product. i have attached my product so you are able to see what it looks like. The whole in the top of my product is for a solar panel as it needs to encorporate renewable energy.

Thanks

• ###### Re: Centre Of Bouyancy

The center of buoyancy is the center of displaced liquid.  The force is the weight of the displaced liquid.  An object sinks until it has displaced an equal weight of liquid.

If an object is denser than the liquid, it sinks.  The buoancy force is the weight of the volume of displaced liquid.  The center of buoyancy is the center of volume as if the entire object were of single density (including filling all voids).

A submerged 1m^3 block of wood experiences the same buoyancy force as an equally shaped 1m^3 block of lead.

If the center of gravity is below the center of buoyancy, the object is stable.  If the CG is above the CB, then the object will want to tip over.

• ###### Re: Centre Of Bouyancy

Tom,

Note that if you use the method that Ed pointed out that any open spaces in your model will need to be filled, as Roland suggested, with a light material. Air would be a good choice, with a standard density of about 1.2 kg/m^3.

Jerry S.