[PSUBS-MAILIST] Need formulas please

["Marten Liebster" <mliebster@tbteam.com>]

As my emails have shown, I am in the process of understanding all that goes
into designing into a PSUB. I always thought of it as: 1) Design it so that
it's round. 2)Put on some ballast tanks 3)Fill them until you sink. 4)Blow
them to rise. 

I've received much insight the past few weeks as I started to take a serious
look into it. This was achieved by posting here, reading archives and
looking through psubs.org.

Someone posted that at 100' there's more than 6,000 psi on the hull. I, as a
programmer not a engineer, would like to be able to calculate such things.
The spreadsheet that allows you to enter variables to end up with a crush
depth, is also great.

I would like to put together a website or application that would contain the
many various pertinent formulas. Formulas such as being able to calculate
the weight of the hull, how much air volume inside my pressure hull, how
much water needs to be brought in to sink the sub, etc... 

This would be publicly available to hopefully assist others. Perhaps even
include the ability to save specific info about the user's sub to save time
in the future. Including internal items that add weight and take away from
the internal air volume.

So I would appreciate it if people could send formulas (with descriptions)
and point me to the various places that contain such formulas. Also any laws
(natural/scientific) that govern the operation of a sub would wonderful.

I want to be able, with some degree of confidence, determine what a safe
operating depth a design would be capable. If I can help others to safely
design their subs, it would be my way of giving back for all the help I've
thus received.

Marten