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RE: [PSUBS-MAILIST] check your numbers
At 150 feet the pressure is only 68 psi- a 3000 psi tank is more than
enough for deballasting- in fact a few 1000 meter subs still use
compressed air to deballast -
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of George
Slaterpryce
Sent: Wednesday, April 05, 2006 7:38 AM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST]
Archimedes is being designed for a crush depth of 300' and an
operational
depth of 150' at crush depth I won't be able to even fill the ballast
because the compressed gas will be at a lower PSI than the ambient
preasure.
(4410psi Ambient vs 3000psi in the pony... full) at operating depth I'll
have close to 600 psi to spare so I can blow and adjust the ballast at
depth.
I kept on running into the design problem of how to (cost effectively)
use
compressed gas in a ballast system and what I came up with is using a
scuba
tank... which automaticly limits me to 3000psi and thus a "floor" of 204
feet before I could no longer blow the tanks. I really wanted to design
something that would crush at 300m and operate at 150m but... I'm gonna
have
to settle for what I have if I want a soft ballast.
George Slaterpryce
----- Original Message -----
From: "Karl Stanley" <karl@stanleysubmarines.com>
To: <personal_submersibles@psubs.org>
Sent: Wednesday, April 05, 2006 9:08 AM
Subject: RE: [PSUBS-MAILIST]
> Why not just make it out of foam- I took a Styrofoam wig head down
2000
> feet and it's still got at least 1/3 of it's volume-and floats just
> fine-
> how deep do you plan on going? so what if the foam looses a bit - or
> even half it's buoyancy- it will still do what you need- and can't
> flood, rust or implode!
>
>
>
> I was attempting to machine the pieces for a metal "bobber" for my new
> soft
> ballast tank's water level indicator (Foam just gives at depth, so
> that's no
> good). The piece is essentially one piece 1cm in diameter 1mm thick
> walls
> and 1cm in length and another 5mm 1mm thick wall and 1cm in length
tube
> with
> two 1cm diameter 1mm thick "washer" end caps with a center bore hole
of
> 5mm.
>
> I can get the pieces machine out great, that's the easy part. I'm
trying
> to
> weld them all together however and I end up with some really shitty
> looking
> welds. I've never attempted to weld something so "delicate" before.
What
> I'm
> trying to make here is a preasure proof bobber and the end product
> should be
> something like a hollow bearing.
>
> All my welding is done via stick arc welding.
>
> Any suggestions?
>
>
>
>
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PSUBS.ORG
PO Box 311
Weare, NH 03281
603-529-1100
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CAN-SPAM Act of 2003. Your email address appears in our database
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Removal of your email address from this mailing list occurs by an
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PSUBS.ORG
PO Box 311
Weare, NH 03281
603-529-1100
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