[PSUBS-MAILIST] bow window

Sun Nov 2 14:50:03 EST 2014

This could be the case.  I would defer to Gregg Cotrell for a position on this.  My guess is that if you have to do any machining this causes heat and induced stress.  In my case, I would need to dress the edges after abrasive jetting so, my guess is that I would need to get it annealed.  I guess the question is for your viewport even though it is cast, is further machining required?  If so this would induce stress, if not you probably don't need to anneal it but you should check with Greg.

Cliff

________________________________
 From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Sent: Sunday, November 2, 2014 8:40 PM
Subject: Re: [PSUBS-MAILIST] bow window

Cliff,
When I bought my cylinder from Reynolds, I was told there was no further annealing required because the stress levels are low enough after forming.  I am not sure if I understood that correctly.  My understanding is that R-Cast Acrylic does not need further  annealing.  Again I might have that wrong, do you know.
Hank--------------------------------------------
On Sun, 11/2/14, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Subject: Re: [PSUBS-MAILIST] bow window
To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
Received: Sunday, November 2, 2014, 2:28 PM

For
a max operating depth of 350 ft, the PVHO says Di=29",
Do=36,   t=6", seat dimension on sides is
7".  Would need to work on housing seat in order not
to have the housing weigh a ton.
Cliff 

         From: Vance Bradley via
Personal_Submersibles
<personal_submersibles at psubs.org>

To: Personal
Submersibles General Discussion
<personal_submersibles at psubs.org> 

Sent: Sunday,
November 2, 2014 8:06 PM
  Subject: Re:
[PSUBS-MAILIST] bow window

Cliff,
I'm thinking full hull diameter, 36" or
thereabouts.Vance

Sent from my iPhone

On Nov 2,
2014, at 2:02 PM, Cliff Redus via Personal_Submersibles
<personal_submersibles at psubs.org>
wrote:

One of my
goals with the R500 was to cut cost and a big cost is the
viewports. The upper portion of the pressure hull that has
the viewports is 36" x 0.25 A516-70 pressure vessel
steel. The design depth is 500 ft.   I like the optics of
flat viewports so I have one 24" diameter x
4" thick acrylic viewport and three smaller 12"
viewports.     I ran the calcs using the PVHO flat
viewport calculator that Jon Wallace implemented at the
  PSubs site.  I have access to abrasive water jet so I was
thinking of jetting these out of off the shelf acrylic and
then having a machine shop dress the edges and cut the
chamfers. I would need to get the viewports annealed after
final machining. I am hoping I can
  talk Gregg Cotrell into doing this for me as he is Dr.
Acrylic. PVHO has detailed info on what the viewport
housing seat needs to look like.
So to me, I don't see any reason
Vance you could not use large flat viewport on the bow. 
You just have to do the PVHO calcs on the thickness and
housing dimensions for your design depth.  You would need
to design the housing to smoothly transition the stresses to
the forward head and run an FEA to confirm stresses in the
viewport and housing.  I don't know what size you were
thinking about or the design depth but it would need be
thick.
Cliff

         From: hank pronk via
Personal_Submersibles <personal_submersibles at psubs.org>
  To: Personal
Submersibles General Discussion <personal_submersibles at psubs.org>

  Sent: Sunday, November
2, 2014 7:02 PM
  Subject: Re:
[PSUBS-MAILIST] bow window

Lets wait and see what the engineers think. 
Cliff is going with a flat port on the R500 I believe.
Hank
--------------------------------------------
On Sun, 11/2/14, via
  Personal_Submersibles <personal_submersibles at psubs.org>
wrote:

  Subject: Re:
[PSUBS-MAILIST] bow window
  To: personal_submersibles at psubs.org
  Received: Sunday, November 2, 2014, 12:20
PM

  That's my
  kind of madness.
  Vance

  -----Original
  Message-----

  From: hank pronk via
Personal_Submersibles
  <personal_submersibles at psubs.org>

  To: Personal Submersibles
General Discussion
  <personal_submersibles at psubs.org>

  Sent: Sun, Nov 2, 2014 11:53
am

  Subject: Re:
[PSUBS-MAILIST] bow window

  Vance,
  That is a question for the engineers of
coarse.  I look at
  it like the hull is a

  big conning tower.  Just look how
  Gamma's CT is built,
  instead of a
hatch it is 
  a flat port.  I know I may be
over
  simplifying it.  The
  engineers are 
probably 
  thinking I am mad but.....  
  Hank

--------------------------------------------
  On Sun, 11/2/14, via Personal_Submersibles
<personal_submersibles at psubs.org>

  wrote:

  Subject: Re: [PSUBS-MAILIST] bow window
  To: personal_submersibles at psubs.org
  Received: Sunday, November 2, 2014, 11:13
AM

  Hank,
  It's not crazy at all. I just
hadn't
  thought of it. I wonder if the
stresses
  imposed at test
  depth would be too high
for the 1/4" hull the thing
  would be
welded to. It's an interesting thought,

though.
  Something to consider,
definitely.

  Vance

  -----Original

Message-----

  From:
hank pronk via Personal_Submersibles

<personal_submersibles at psubs.org>

  To:
personal_submersibles
  <personal_submersibles at psubs.org>

  Sent: Sun, Nov 2, 2014
10:49 am

  Subject:
[PSUBS-MAILIST] bow window

Vance,
  Have you looked at a large full
size flat port for the
  front
  of your K350.  I 
  did
that with one of my early subs.  I had a 24 inch flat
  port 4 inches thick 
  with
a 24 inch protection dome.  The optics were stunning,
  nobody believed it 
  was 4
inches thick.  I checked with
  Reynolds Polymer and a
  7
  inch thick 37inch 
  square
unpolished piece is 3,000 dollars US.  Is that just
  crazy talk or what. 

Hank

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