[PSUBS-MAILIST] bow window

Sun Nov 2 14:02:34 EST 2014

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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