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Re: [PSUBS-MAILIST] Viewport design question

To: <personal_submersibles@psubs.org>
Subject: Re: [PSUBS-MAILIST] Viewport design question
From: "Chip Will" <divtruk@sbcglobal.net>
Date: Tue, 7 Mar 2006 12:41:02 -0800
References: <20060307163350.64505.qmail@web53004.mail.yahoo.com> <BAY101-DAV148937EB71C523631B1B62C5EE0@phx.gbl>
Reply-to: personal_submersibles@psubs.org
Sender: owner-personal_submersibles@psubs.org
I was in San Francisco a while back and was looking at the Dennoch. (See
link below) This was the sub built by some Stanford students out of a
propane tank. I looked at their viewport and how it was installed. They took
a long rectangle of 1" acrylic and formed it around the diameter of the
conning tower. The window opening was then cut out and the acrylic was
fastened to the tower. Could the same concept be used but not cut out  a
single large rectangle but several smaller rectangles or even ovals. This
way you are using one large sheet of  acrylic, but covering several
viewports with one piece. This would spread the stress out over a larger
area.

Chip

http://www.psubs.org/museum/museum_sfphotos.html



----- Original Message ----- 
From: "George Slaterpryce" <gslaterp@hotmail.com>
To: <personal_submersibles@psubs.org>
Sent: Tuesday, March 07, 2006 8:43 AM
Subject: Re: [PSUBS-MAILIST] Viewport design question


> As someone else said in this particular thread, the seaworld windows stay
at
> a constant preasure which limits fatigue. (sorry, I just emptied my inbox
so
> I can't see who said it :( )
>
> When you go up and down in preasure multiple times the window will flex
back
> and forth.. this is kind of like what you do when you flex a paperclip
back
> and forth... what happens is the stress fatigue becomes more pronounced
and
> then finally the material fails and cracks or breaks off. On a square
window
> it would be the corners that flex the most and they would break off
sooner.
> On a round window the stress is distributed as evenly as can be so there
> would be less fatigue and a longer operational life.
>
> George Slaterpryce
> ----- Original Message ----- 
> From: "Rob Ossian" <rob_neptune@yahoo.com>
> To: <personal_submersibles@psubs.org>
> Sent: Tuesday, March 07, 2006 11:33 AM
> Subject: Re: [PSUBS-MAILIST] Viewport design question
>
>
> > Ah - a non-pressurized enclosure would explain the
> > Oscar II's square windows..  Thanks!
> >
> > That still doesn't explain the alternate application,
> > however, the large rectangular windows of the SeaWorld
> > variety.  Certainly an appropriately beveled viewport
> > (even with right angles) could be waterproofed
> > effectively in a similar fashion?
> >
> > --- George Slaterpryce <gslaterp@hotmail.com> wrote:
> >
> >> Plus round windows are less likely to push through.
> >> It's the same theory
> >> behind manhole covers, no matter which way you turn
> >> them they won't fall
> >> down the hole.
> >>
> >> Although I wonder if you couldn't slope the window
> >> so that the outside
> >> surface had 50% more area than the inside surface
> >> and the width of the windo
> >> would be at a slope.... uh kind of like the attached
> >> gif shows.  this way
> >> the stress would be distributed over a wider area,
> >> although the corners
> >> would still chip after a while.
> >>
> >> But if you want rectangular windows for asthetic
> >> purposes, could you not put
> >> some kind of plating to block off the bottom, top
> >> and sides so it looks
> >> rectangular?
> >>
> >> ----- Original Message ----- 
> >> From: "Jay K. Jeffries" <bottomgun@mindspring.com>
> >> To: <personal_submersibles@psubs.org>
> >> Sent: Tuesday, March 07, 2006 10:59 AM
> >> Subject: Re: [PSUBS-MAILIST] Viewport design
> >> question
> >>
> >>
> >> > Rob,
> >> > Those windows are not pressure resistant.  They
> >> are for underway on the
> >> > surface in inclement weather.  The space behind
> >> them are free-flooding.
> >> > Respectfully,
> >> > Jay K. Jeffries
> >> >
> >> > -----Original Message-----
> >> >>From: Rob Ossian <rob_neptune@yahoo.com>
> >> >>Sent: Mar 7, 2006 10:46 AM
> >> >>To: personal_submersibles@psubs.org
> >> >>Subject: Re: [PSUBS-MAILIST] Viewport design
> >> question
> >> >>
> >> >>
> >> >>Then, while researching further I came across
> >> these:
> >>
> >>>http://news.bbc.co.uk/olmedia/1330000/images/_1332322_windows_300.jpg
> >>
> >>>http://news.bbc.co.uk/olmedia/1615000/images/_1617932_windows_300.jpg
> >>
> >>>http://members.fortunecity.com/omegatimes/mdf100041.jpg
> >> >>
> >> >>These images are of right angled windows embedded
> >> in
> >> >>the conning tower of a Russian Antey-class [NATO
> >> name
> >> >>'Oscar II'] nuclear submarine, which has been
> >> claimed
> >> >>to be capable of diving to 600 metres (about 2000
> >> >>feet).
> >> >>
> >> >>Thoughts?
> >> >>/Rob
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >>
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References:
- Re: [PSUBS-MAILIST] Viewport design question
  - From: Rob Ossian <rob_neptune@yahoo.com>
- Re: [PSUBS-MAILIST] Viewport design question
  - From: "George Slaterpryce" <gslaterp@hotmail.com>
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