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[Jonathan Wallace <jon@whoweb.com>]

From owner-owner@whoweb.com Sun Mar 15 04:59:20 1998
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Subject: BOUNCE personal_submersibles@psubs.org:    Non-member submission from ["Sean Walinga" <swalinga@telusplanet.net>]   
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From: "Sean Walinga" <swalinga@telusplanet.net>
To: <personal_submersibles@psubs.org>
Subject: Re: Pressure regulation
Date: 	Sun, 15 Mar 1998 03:03:20 -0700
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Hi Stan,

>Using acrylic as a structural material though, I would worry about trying
to
>make it a 1 atmosphere (or pressure hull) submarine.

Just thought I'd respond to this with a website to check out.
http://ussubs.com/T-subs_folder/t-sub.seaview.html
You may find it interesting...


>The design I am working on has two hatches (redundancy is good)!  One is on
>top for entry and egress on the surface, and one on the bottom for
>entry/egress when parked on the bottom, so it serves as a diver delivery
>vehicle as well, while still a 'dry' design.  Of course ballast tanks are
>required since the cabin volume is constant in a dry sub, and therefore
cannot
>serve a dual purpose as a ballast tank.

What shape have you chosen for this?

>All sub designs interest me, but the ambient pressure dry design is what
I'm
>working on, and therefore is the focus of my interest.

I've been interested in the ambient dry as well but found the limit of depth
unacceptable.

>Down bubble!
>
>Stan


As an after thought here. Since CO2 is heavier than O2, supplying fresh air
at the top and porting the excess air out the bottom should give constant
fresh air and bleed off the CO2 first. In "theory" this should work... Any
comments?

Sean