[PSUBS-MAILIST] bow window

[Pete Niedermayr via Personal_Submersibles]

What is the thickest off the shelf acrylic ?

Pete 

--------------------------------------------
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>
 Date: Sunday, November 2, 2014, 1:02 PM
 
 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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