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Re: [PSUBS-MAILIST] OSS (Pressure hull)
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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