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Re: [PSUBS-MAILIST] OSS (Pressure hull)
Pierre,
I vote for the vertical design, you have probably guessed that already.
Today a contacted the supplier of the endcaps. They will give me the exact
dimensions of the caps. Especialy the lenght of the cilindrical part is
crusial for the calculations. As soon as i get the information i will make
the drawing and contact you about where and how to send it.
Greatings,
Thijs Struijs
----- Original Message -----
From: "Pierre Poulin" <pipo305@hotmail.com>
To: <personal_submersibles@psubs.org>
Sent: Wednesday, February 12, 2003 11:34 PM
Subject: Re: [PSUBS-MAILIST] OSS (Pressure hull)
> Cool! I use autocad too! You can make the drawing with the thickness. Only
> the hull with view ports and hatch. You can ad intern part only if they ad
> to the overall strengt of the hull.
>
> How many of you out there like more the horizontal vs vertical design?
> Please vote!
>
> Ian, are you still there? Can you give the basic hull dim?
>
> Pierre Poulin
> "forgot cat outside yesterday, must go petshop today"
>
>
>
>
>
>
>
>
> >From: "Thijs Struijs" <thijs-struijs@planet.nl>
> >Reply-To: personal_submersibles@psubs.org
> >To: <personal_submersibles@psubs.org>
> >Subject: Re: [PSUBS-MAILIST] OSS (Pressure hull)
> >Date: Wed, 12 Feb 2003 21:50:58 +0100
> >
> >Pierre,
> >
> >That would be great! I can make a 3D autocad drawing of the design.
Eighter
> >as a solid shape or with the actual materialthicknesses. I can draw the
> >different parts in different layers, you say it and i will send them as
you
> >wish.
> >
> >greatings,
> >
> >Thijs Struijs
> >
> >----- Original Message -----
> >From: "Pierre Poulin" <pipo305@hotmail.com>
> >To: <personal_submersibles@psubs.org>
> >Sent: Wednesday, February 12, 2003 1:47 PM
> >Subject: RE: [PSUBS-MAILIST] OSS (Pressure hull)
> >
> >
> > > Thanks, Alec.
> > >
> > > One of my friend work in a university here. The students he work with
> >made
> >a
> > > psub as there final project ( see
> > > http://www.imq.qc.ca/presse/Archives/p001120.htm )
> > >
> > > I can arrange with my friend and those student a computer simulation
of
> >the
> > > design. I know they did it with there sub.
> > >
> > > What about that?
> > >
> > > Pierre Poulin
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > >From: "Alec Smyth" <Asmyth@changepoint.com>
> > > >Reply-To: personal_submersibles@psubs.org
> > > >To: <personal_submersibles@psubs.org>
> > > >Subject: RE: [PSUBS-MAILIST] OSS (Pressure hull)
> > > >Date: Tue, 11 Feb 2003 21:17:22 -0500
> > > >
> > > >Here's a typical lesson I learned when I went from a submarine
project
> >in
> > > >my CAD software to a submarine project in my garage. My original
design
> > > >called for an endcap on the stern, I think it was 30.5" in diameter
or
> > > >something like that. When I went to order it, they quoted me $4,160
for
> >a
> > > >single endcap, of which $4,000 was the setup cost and $160 the
> >production
> > > >cost. The $4,000 was because my dimensions were not standard. But if
I
> > > >adjusted my design by half an inch, the cost was just $160.
> > > >
> > > >You'll find standard dimensions in references like the Pressure
Vessel
> > > >Handbook (or some European equivalent). It doesn't hurt to talk to
the
> > > >manufacturers, they are very helpful indeed. After all you're the
> >customer
> > > >and they want to sell.
> > > >
> > > >If someone on the list can run a finite element analysis on the
design
> >with
> > > >the viewport seats through the endcap flanges, and they can be
designed
> > > >with a good safety margin, I'm all for a vertical saucer design.
Voila,
> >an
> > > >instant pressure hull.
> > > >
> > > >rgds,
> > > >
> > > >Alec
> > > >
> > > >-----Original Message-----
> > > >From: Thijs Struijs [mailto:thijs-struijs@planet.nl]
> > > >Sent: Tuesday, February 11, 2003 4:43 PM
> > > >To: personal_submersibles@psubs.org
> > > >Subject: Re: [PSUBS-MAILIST] OSS (Pressure hull)
> > > >
> > > >
> > > >Pierre,
> > > >
> > > >Good idea for the OSS pressure hull.
> > > >
> > > >These endcaps can be bought. There are probably some standard
> >dimensions
> > > >because they need special tools to make them. At this moment i did
not
> > > >contact any manufacturers at all because when i do, i want to know
what
> >i
> > > >am
> > > >talking about. You don't get a second chance meeting someone for the
> >firts
> > > >time. I do know there are standard relations between diameter and
> >radii.
> > > >For
> > > >more information you can have a look at these websites:
> > > >
> > > >http://www.bakertankhead.com/products.htm (USA)
> > > >
> > > >http://www.afflerbach.de/html/default.htm (Germany)
> > > >
> > > >http://www.antonius.nl/antonius/home/products.asp?lang=English
> > > >(Netherlands)
> > > >
> > > >Greetings,
> > > >
> > > >Thijs Struijs
> > > >
> > > >
> > > >
> > > >----- Original Message -----
> > > >From: "Pierre Poulin" <pipo305@hotmail.com>
> > > >To: <personal_submersibles@psubs.org>
> > > >Sent: Tuesday, February 11, 2003 1:47 PM
> > > >Subject: RE: [PSUBS-MAILIST] OSS (Pressure hull)
> > > >
> > > >
> > > > > Hey, OSS group!
> > > > >
> > > > > How about using that hull for the project? It look simple and
could
> >have
> > > >two
> > > > > persons side by side. Like the Cousteau thing.
> > > > >
> > > > > Also, are those end-caps available or do you have to build them
from
> > > > > scratch?
> > > > >
> > > > > Bye, Bye!
> > > > >
> > > > > Pierre Poulin
> > > > > "I'm skating instead of diving!"
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > >From: "Alec Smyth" <Asmyth@changepoint.com>
> > > > > >Reply-To: personal_submersibles@psubs.org
> > > > > >To: <personal_submersibles@psubs.org>
> > > > > >Subject: RE: [PSUBS-MAILIST] Pressure hull
> > > > > >Date: Mon, 10 Feb 2003 16:42:50 -0500
> > > > > >
> > > > > >Thijs,
> > > > > >
> > > > > >I love the simplicity of a hull made from simply two endcaps. I
> >thought
> > > > > >mine would be simple enough as it is basically a reinforced pipe,
> >yet
> > > > > >welding two elliptical heads like this would have saved me at
least
> >6
> > > > > >months work, or more. The reason is you would not have to contend
> >with
> > > >a
> > > > > >cylinder which is never quite round when you receive it, and
> >getting
> > > >round
> > > > > >rings into an oval cylinder was the hardest thing on the whole
> >project
> > > >so
> > > > > >far. The part I would worry about is that you have inserts that
> >cross
> > > >the
> > > > > >join between the two halves. Not that it can't be done, but it
> > > >introduces
> > > > > >what to me at any rate are unknowns in the stress calculations. I
> >try
> > > >to
> > > > > >use only things that I can calculate.
> > > > > >
> > > > > >Besides Cousteau's saucer, there is another sub out there based
on
> >this
> > > > > >principle of joining two elliptical heads. Unfortunately I can't
> >recall
> > > >its
> > > > > >name, but I remember seeing a picture of it online somewhere,
> >hanging
> > > >from
> > > > > >a crane and painted white and orange. If anyone can recall the
sub
> >I'm
> > > > > >referring to, you might find it a neat idea. What they did was
> >incline
> > > >the
> > > > > >"saucer". It was oriented in a horizontal plane like Cousteau's,
> >except
> > > >it
> > > > > >was also inclined "up hill" about 30-45 degrees. While this might
> >seem
> > > >odd,
> > > > > >they also had an exostructure that faired it. The lower head had
> >two
> > > >bubble
> > > > > >windows facing forward, but as the saucer was inclined, these two
> > > >windows
> > > > > >did not have to cross the weld between the two heads. The
occupants
> > > > > >traveled lying down and the hatch was of course on the upper
shell.
> > > > > >
> > > > > >rgds,
> > > > > >
> > > > > >Alec
> > > > > >
> > > > > >
> > > > > > -----Original Message-----
> > > > > >From: Thijs Struijs [mailto:thijs-struijs@planet.nl]
> > > > > >Sent: Sunday, February 09, 2003 12:02 PM
> > > > > >To: PSUBS
> > > > > >Subject: [PSUBS-MAILIST] Pressure hull
> > > > > >
> > > > > >
> > > > > >
> > > > > >To all,
> > > > > >
> > > > > >I would like some reactions on a drawing i made a while ago. You
> >can
> > > >find
> > > > > >it at:
> > > >http://www.prismnet.com/~moki/20030126.073208/doubleXendXcapX.jpg
> > > > > >.
> > > > > >The idea is to construct a very simple pressure hull out of two
> > > > > >torispherical endcaps. The conning "tower" is made out of a
> >standard
> > > >line
> > > > > >pipe with a little overdimensioned wallthickness and the smallest
> > > >possible
> > > > > >diameter. The endcaps are made with a small cilindrical section
on
> >it
> > > >but
> > > >i
> > > > > >am afraid that the tower will intersect with the torispherical
> >part.
> > > > > >In order to keep it simple i chose a very common steel for the
> >endcaps.
> > > >It
> > > > > >is P265GH (yield strenght 265 n/mm^2, 38500 psi, tensile strenght
> >410
> > > > > >n/mm^2, 59500 psi). This is an "off the shelf" material at
> >Afflerbach,
> > > >the
> > > > > >german manufacturer. I think you could call it soft boiler steel.
> > > > > >To calculate the strenght of it (apart from the conningtower and
> > > >viewports)
> > > > > >one can use the formulas for a sphere, using the dishing radius
of
> >the
> > > > > >endcap (in this case 1040 mm). Maybe it is my age, to much
alcohol
> >or
> > > >lack
> > > > > >of intelligence but watever method i use (ABS, Lloyd's or an old
> > > >pressure
> > > > > >vessel codebook) i get different outcommings. Can anyone of you
say
> > > > > >something sensible on this? I am considdering a wallthickness of
12
> >mm,
> > > > > >divingdepth 100 mtr?
> > > > > >If it is ever going to be build it will be tested unmanned to a
> >depth
> > > >50%
> > > > > >more than its safe working depth. Should it collapse i will hold
no
> >one
> > > > > >responsible for that. So please be free to give your advise.
> > > > > >
> > > > > >Thank you very much,
> > > > > >
> > > > > >Thijs Struijs
> > > > > >
> > > > >
> > > > >
> > > > > _________________________________________________________________
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