RE: [PSUBS-MAILIST] Need formulas please

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

Ray,

Thanks. I'm planning to incorporate those into my site/program. As far as I
can tell there are about 3 versions of the hull stress spreadsheet. I'm
planning on using the one from Jake, as that's the most recent.

I'm hoping that my site will wind up with a good amount of the calculations
available to be the most assistance to others. Those on psubs were going to
be my starting point.

ML

-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Ray Keefer
Sent: Monday, May 03, 2004 2:37 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Need formulas please

Hi Marten,

Go to http://www.psubs.org/designguide/designguide.html. There are serveral
spreadsheets already.

Regards,
Ray


Marten Liebster wrote:
> 
> 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
> 
>