Re: [PSUBS-MAILIST] Ballast volume moon Shaped

[Ian Roxborough <irox@ix.netcom.com>]

Hi,

According to QCad, 

the circumference of the cross section = 53.1066 inches
the area of the cross section = 104.457 square inches

At 12 foot long, this would ~15,000 cubic inches.
This would give you 547 pounds of buoyancy.

I don't know for sure if the information QCad gave
me is correct, but the cross section of the tank
is equal to approx. one third of the cross section
of the 20" OD cylinder.  This sounds reasonable I guess.

Ian.


On Mon, 17 Jun 2002 14:36:08 -0500
"John R. Farrington" <jrf@austin.ibm.com> wrote:

> I think the 'area' of your ballast tank is going to be roughly
> 55.38 square inches.  Take that times 12 feet, and you 7975
> cubic inches, which is 4.65 cubic feet for each of your ballast
> tanks.
> 
> Each tank would displace roughly 300 pounds of water, giving a
> total of 600 pounds of buoyancy when the entire tank is below
> the surface of the water.  You'll have to also tank into account
> the weight of your tanks as well.
> 
> I just 'brute-forced' these numbers on scratch paper so I could
> be wrong.  If you're interested, I can type of the description
> of how I came up with these numbers.  Might be a good idea to
> get a verification from someone else with a CAD package.
> 
> -John


-- 
The moon ate the sun on Monday and it was an awsome sight to see.