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Doug,
Other then poor welds, on what do you
base your safety argument? If it is poor welding, then the person
starting with a tank is still in trouble since the tank seams isn't the only
welding.
I don't know details about propane tanks but assume
they are built to standards as good or better then most home built tanks would
be. That, and the fact that you get two end caps and the round
cylinder all welded together and in one purchase are about the only advantages I
see.
On the minus side;
You have to, clean the smell out of
it.
You have to, check it for roundness. (a vestal
built to contain pressure may not be as round as a vestal to keep pressure
out needs to be)
You have to fit framing in to it through what ever
openings you make for your conning tower or access hatch.
You have to crawl in and out thousands of times
through the same little opening during construction. Believe me, thousands
of times! (damn, I thought that screw was a philips and the straight
slot it back on the bench) Working on the interior is so much easier
with one end cap not welded on until it has to be.
You still have to order fabricate and weld
materials for viewports, a conning tower and hatch of some kind.
And you still have a sub built from a propane tank,
and no documentation for the hull material.
Ordering end caps, having a hull rolled and doing
some welding isn't difficult! There is so much more to building a sub then
the tank. If the two end caps and a steel tube are your pit
falls, your probably not going to ever finish it and have a working sub
anyway.
Dan H.
----- Original Message -----
Sent: Monday, December 26, 2005 11:41
PM
Subject: Re: [PSUBS-MAILIST] Choosing sub
design (Was: Carsten in Wired Magazine)
Shipmates,
With all due respects, I am thinking "no". To me, there is a very
strong "safety argument" to be made for rolling your own. I
know of no "safety argument" to be made in defense of using a
propane tank. For me, I admit my bias, the selection of a
propane tank is in every case, and without exception, evidence that
the designer lacks the knowledge base to build a safe submarine. To me
it is all very back and white on this one issue.
Can someone out there provide the "safety argument" for
propane? My mind is open, I have simply never, ever heard the
argument. Is there one? Please bring it forth. Again, my
mind is open.
Doug Farrow
SeaLordOne
-----Original Message-----
From: Joseph Perkel
<joeperkel@hotmail.com>
To: personal_submersibles@psubs.org
Sent:
Mon, 26 Dec 2005 17:31:31 +0000
Subject: RE: [PSUBS-MAILIST] Choosing sub
design (Was: Carsten in Wired Magazine)
I think what Stan just said should be added to the PSUBS ethos for new
arrivals to this game.
Eloquent simplicity, good job!
Joe P
From: sfreihof@aol.com
Reply-To:
personal_submersibles@psubs.org
To:
personal_submersibles@psubs.org
Subject: [PSUBS-MAILIST]
Choosing sub design (Was: Carsten in Wired Magazine)
Date: Mon, 26
Dec 2005 10:14:09 -0500
Welcome Kris;
First, decide what design you want to use. You can choose from a
1 atm sub, to an ambient sub wet or dry. It depends on your needs,
capabilities, and skills.
If you choose the 1 atm design, most on this list would suggest you
"roll your own" hull, but propane tank based designs have been
done successfully if you are aware of the drawbacks. The consensus is
that it isn't worth the savings because it won't save you much and entails
too many uncertainties.
Ambient subs are easier to build but have some operational limitations
and risks. You need to be a qualified and competent scuba diver first
to understand the drawbacks of ambient subs.
Again, it all depends on your needs, capabilities and skills.
Everything is a trade-off.
Stan
-----Original Message-----
From: Kris
<kc0opd@gmail.com>
To: personal_submersibles@psubs.org
Sent:
Sun, 25 Dec 2005 15:00:20 -0600
Subject: Re: [PSUBS-MAILIST] Carsten in
Wired Magazine
Hello!
I'm new to the area of personal subs, and I'm looking for some
information. I found the PSUBS web site, which gave us a great start
into our sub design.
My father and I are attempting to build a sub for use in a freshwater
lake, with a maximum depth of no more than 50 feet.
At the present time, our biggest problem is finding a suitable tank
for the hull. We have considered a used LP tank, but there is the
concern about residual LP. What has everyone else done, or what can
you recommend?
Thanks in advance for your help.
Kris
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