From: DJACKSON99@aol.com
Reply-To: personal_submersibles@psubs.org
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Hatch seal
Date: Wed, 5 May 2004 17:25:45 EDT
Howdy Pierre
(Sorry if this is a repeat, but I did not see my previous reply show up.)
Check out "Austin Hardware & Supply" www.austinhardware.com. They have
exactly what you described in several sizes. You have to get their printed
catalog. See page 374.
Have you considered neoprene? http://k-mac-plastics.net/neoprene-sheet.htm
It comes in various densities.
Please correct me if I am wrong, but I think there will be considerable
pressure, or at least could be. Being ambient and flowing air through the
cabin
and out the bottom means that the air inside the cabin will be at the same
pressure as the weight of water at the bottom of the cabin. Since the top
of the
cabin is sallower the air pressure at the top of the cabin is greater that
the
water pressure outside the top of the cabin. I seems to me that you could
think of it as an under water box, open at the bottom and full of air. The
pressure at the top of the box is pushing outward in direct proportion to
the
height of the box. Consider if you turned your sub upside down and filled
it with
water. The top hatch will have to hold back that much pressure. I hope I
am
wrong about this because I have been fighting to build a hatch I can trust.
I
finally got the top on my boat last week and decided there was enough room
to
have the hatch open inward. That way the pressure will insure a good seal
without elaborate latching. I plan to use 1/4 inch neoprene for a seal.
I also finally forked over the change for a domain name:
www.submarineboat.com My hatch design is at the bottom of the "Putting the
Hull Together" page.
Let me know what you think.
Doug Jackson
In a message dated 5/5/2004 12:16:47 AM Central Daylight Time,
ojaibees@ojai.net writes:
Pierre, How about a tire inner tube?
Brian
----- Original Message -----
From: "Pierre Poulin" <pipo305@hotmail.com>
To: <personal_submersibles@psubs.org>
Sent: Tuesday, May 04, 2004 6:44 PM
Subject: [PSUBS-MAILIST] Hatch seal
> Thx Brian!
>
> But I know what seal I want. I don't know if it will work but my problem
is
> finding it in a store...
>
> I want to buy basicaly a rubber hose with a flat side that can be glued.
> Since my sub is ambient, I imagine that there is almost no pressure on
the
> seal...
>
> I will test that out and tell you guys!
>
> Thanks again Brian!
>
> Pierre Poulin
>
>
> >From: "Brian Cox" <ojaibees@ojai.net>
> >Reply-To: personal_submersibles@psubs.org
> >To: <personal_submersibles@psubs.org>
> >Subject: Re: [PSUBS-MAILIST] Pressure hull construction
> >Date: Tue, 4 May 2004 14:34:46 -0700
> >
> >Pierre (looking for hatch seal), What kind of hatch seal are you
looking
> >for? What is your delema?
> >
> >Brian
> >
> >----- Original Message -----
> >From: "Pierre Poulin" <pipo305@hotmail.com>
> >To: <personal_submersibles@psubs.org>
> >Sent: Tuesday, May 04, 2004 10:55 AM
> >Subject: RE: [PSUBS-MAILIST] Pressure hull construction
> >
> >
> > > Hi Marten,
> > >
> > > You look like you are about to choose between an 1atm or an ambient
sub.
> >Am
> > > I right?
> > >
> > > Maybe you have to ask yourself some basic questions like:
> > > What do you want to do with the sub?
> > > How many times per year do you plan to dive?
> > > Fresh or salt water?
> > > Depth of the dive? (100 feet)
> > > How many years you think your sub will be operational before you
srap
> >it.
> > > Do you do scuba diving? If so, what do you like best about scuba
diving?
> > > What you don't like?
> > > How will it be different in a psub?
> > > How will you tow the boat? Will it stay on a peer?
> > > What is the budget you plan for it?
> > > How many years you want to spend building/designing it?
> > > Will it be as fun for you to build it and gather parts as diving in
the
> >sub?
> > > How long you want to be able to dive? (how many hours under the
water)
> > > Any passengers?
> > > Etc...
> > >
> > > I think that answering those questions might help you choose the
correct
> > > type of psub for you. I did the exact same thing and decided to
switch
> >from
> > > 1-atm to dry-ambient.
> > >
> > > Once this is clear for you, then you will be able to move to the
design
> >step
> > > I think.
> > >
> > > I hope it help a bit!
> > >
> > > Pierre "still looking for a hatch seal" Poulin
> > >
> > >
> > >
> > >
> > > >From: "Marten Liebster" <mliebster@tbteam.com>
> > > >Reply-To: personal_submersibles@psubs.org
> > > >To: <personal_submersibles@psubs.org>
> > > >Subject: [PSUBS-MAILIST] Pressure hull construction
> > > >Date: Tue, 4 May 2004 12:45:11 -0400
> > > >
> > > >
> > > >Those with 1 atm subs, how is/will be your pressure hull be
> >constructed?
> > > >
> > > >Was/will it be assembled by yourself or by a fabrication shop?
> > > >
> > > >Even if I were to design the perfect (unlikely) psub, I don't know
if I
> > > >could trust myself or someone else with my life.
> > > >
> > > >Taking a trip in an airplane is different. There are industry and
> >federal
> > > >standards for the construction, usage and maintenance. Also there
are
> > > >rigorous inspections. Plus, each plane isn't a one off creation.
Also,
> > > >ignorance is bliss. :-)
> > > >
> > > >So even though I would spec out the proper material and proper
welding
> > > >techniques, there's still that feeling of uncertainty. Even it was
to
> >be
> > > >pressure tested to 2x operating depth, in the back of my mind would
the
> > > >possibility of problems developing over time with things I had
built
> >for
> > > >myself.
> > > >
> > > >Safety being the primary concern, this might be a deal breaker for
me
> >(not
> > > >for others, it's a personal decision) for a 1 atm sub. I misquoted
a
> >figure
> > > >in a previous posting - 100ft = ~6000 lbs of pressure per square
foot
-
> >I
> > > >incorrectly stated PSI. That's about the max operating depth I
planned
> >to
> > > >be
> > > >at. Doesn't seem to allow for too large of a margin for a badly
> >fabricated
> > > >pressure hull.
> > > >
> > > >This has sparked another related question:
> > > >Would properly engineered (pardon my misuse of English) internal
> >framing
> > > >widen the margin for error?
> > > >
> > > >Thanks again to all who have helped me to better understand how a
sub
> >is
> > > >properly designed and engineered.
> > > >
> > > >Marten
> > > >
> > > >
> > > >
> > > >
> > >
> >
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