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Re: [PSUBS-MAILIST] OSS (Pressure hull)
thanks Thijs Struijs,
When I build an 1 atm sub (I will finish my dry-ambient first), I will go
with those end-caps! Looks more easy and have low displacement.
Pierre
>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: Tue, 11 Feb 2003 22:43:05 +0100
>
>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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