<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px"><div><span></span></div><div></div><div>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.</div><div><br><br><br>Cliff</div><div><br></div><div><br></div> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px;"> <div style="font-family: HelveticaNeue, Helvetica Neue,
Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"> <div class="hr" style="margin: 5px 0px; padding: 0px; border: 1px solid rgb(204, 204, 204); border-image: none; height: 0px; line-height: 0; font-size: 0px;" contenteditable="false" readonly="true"></div> <font face="Arial" size="2"> <b><span style="font-weight: bold;">From:</span></b> hank pronk via Personal_Submersibles <personal_submersibles@psubs.org><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Sunday, November 2, 2014 8:40 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] bow window<br> </font> </div> <div class="y_msg_container"><br><br clear="none">Cliff,<br clear="none">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.<br clear="none">Hank--------------------------------------------<br clear="none">On Sun, 11/2/14, Cliff Redus via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"> Subject: Re: [PSUBS-MAILIST] bow window<br clear="none"> To: "Personal Submersibles General Discussion" <<a href="mailto:personal_submersibles@psubs.org" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> Received: Sunday, November 2, 2014, 2:28 PM<br clear="none"> <br clear="none"> For<br clear="none"> a max operating depth of 350 ft,
the PVHO says Di=29",<br clear="none"> Do=36, t=6", seat dimension on sides is<br clear="none"> 7". Would need to work on housing seat in order not<br clear="none"> to have the housing weigh a ton.<br clear="none"> Cliff <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> From: Vance Bradley via<br clear="none"> Personal_Submersibles<br clear="none"> <<a href="mailto:personal_submersibles@psubs.org" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> <br clear="none"> To: Personal<br clear="none"> Submersibles General Discussion<br clear="none"> <<a href="mailto:personal_submersibles@psubs.org" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br clear="none"> <br clear="none"> Sent: Sunday,<br clear="none"> November 2, 2014 8:06 PM<br
clear="none"> Subject: Re:<br clear="none"> [PSUBS-MAILIST] bow window<br clear="none"> <br clear="none"> <br clear="none"> Cliff,<br clear="none"> I'm thinking full hull diameter, 36" or<br clear="none"> thereabouts.Vance<br clear="none"> <br clear="none"> Sent from my iPhone<br clear="none"> <br clear="none"> <br clear="none"> On Nov 2,<br clear="none"> 2014, at 2:02 PM, Cliff Redus via Personal_Submersibles<br clear="none"> <<a href="mailto:personal_submersibles@psubs.org" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> wrote:<br clear="none"> <br clear="none"> One of my<br clear="none"> goals with the R500 was to cut cost and a big cost is the<br clear="none"> viewports. The upper portion of the pressure hull that has<br clear="none"> the viewports is 36" x 0.25 A516-70 pressure vessel<br clear="none"> steel. The design depth is 500 ft. I
like the optics of<br clear="none"> flat viewports so I have one 24" diameter x<br clear="none"> 4" thick acrylic viewport and three smaller 12"<br clear="none"> viewports. I ran the calcs using the PVHO flat<br clear="none"> viewport calculator that Jon Wallace implemented at the<br clear="none"> PSubs site. I have access to abrasive water jet so I was<br clear="none"> thinking of jetting these out of off the shelf acrylic and<br clear="none"> then having a machine shop dress the edges and cut the<br clear="none"> chamfers. I would need to get the viewports annealed after<br clear="none"> final machining. I am hoping I can<br clear="none"> talk Gregg Cotrell into doing this for me as he is Dr.<br clear="none"> Acrylic. PVHO has detailed info on what the viewport<br clear="none"> housing seat needs to look like.<br clear="none"> So to me, I don't see any reason<br clear="none"> Vance you
could not use large flat viewport on the bow. <br clear="none"> You just have to do the PVHO calcs on the thickness and<br clear="none"> housing dimensions for your design depth. You would need<br clear="none"> to design the housing to smoothly transition the stresses to<br clear="none"> the forward head and run an FEA to confirm stresses in the<br clear="none"> viewport and housing. I don't know what size you were<br clear="none"> thinking about or the design depth but it would need be<br clear="none"> thick.<br clear="none"> Cliff<br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> From: hank pronk via<br clear="none"> Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> To: Personal<br clear="none"> Submersibles General Discussion <<a
href="mailto:personal_submersibles@psubs.org" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> <br clear="none"> Sent: Sunday, November<br clear="none"> 2, 2014 7:02 PM<br clear="none"> Subject: Re:<br clear="none"> [PSUBS-MAILIST] bow window<br clear="none"> <br clear="none"> <br clear="none"> Lets wait and see what the engineers think. <br clear="none"> Cliff is going with a flat port on the R500 I believe.<br clear="none"> Hank<br clear="none"> --------------------------------------------<br clear="none"> On Sun, 11/2/14, via<br clear="none"> Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> wrote:<br clear="none"> <br clear="none"> Subject: Re:<br clear="none"> [PSUBS-MAILIST] bow window<br
clear="none"> To: <a href="mailto:personal_submersibles@psubs.org" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a><br clear="none"> Received: Sunday, November 2, 2014, 12:20<br clear="none"> PM<br clear="none"> <br clear="none"> That's my<br clear="none"> kind of madness.<br clear="none"> Vance<br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> -----Original<br clear="none"> Message-----<br clear="none"> <br clear="none"> From: hank pronk via<br clear="none"> Personal_Submersibles<br clear="none"> <<a href="mailto:personal_submersibles@psubs.org" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> <br clear="none"> To: Personal Submersibles<br
clear="none"> General Discussion<br clear="none"> <<a href="mailto:personal_submersibles@psubs.org" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> <br clear="none"> Sent: Sun, Nov 2, 2014 11:53<br clear="none"> am<br clear="none"> <br clear="none"> Subject: Re:<br clear="none"> [PSUBS-MAILIST] bow window<br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> Vance,<br clear="none"> That is a question for the engineers of<br clear="none"> coarse. I look at<br clear="none"> it like the hull is a<br clear="none"> <br clear="none"> big conning tower. Just look how<br clear="none"> Gamma's CT is built,<br clear="none"> instead of
a<br clear="none"> hatch it is <br clear="none"> a flat port. I know I may be<br clear="none"> over<br clear="none"> simplifying it. The<br clear="none"> engineers are <br clear="none"> probably <br clear="none"> thinking I am mad but..... <br clear="none"> Hank<br clear="none"> <br clear="none"> --------------------------------------------<br clear="none"> On Sun, 11/2/14, via Personal_Submersibles<br clear="none"> <<a href="mailto:personal_submersibles@psubs.org" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> <br clear="none"> wrote:<br clear="none"> <br clear="none"> Subject: Re: [PSUBS-MAILIST] bow window<br clear="none"> To: <a href="mailto:personal_submersibles@psubs.org" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a><br clear="none">
Received: Sunday, November 2, 2014, 11:13<br clear="none"> AM<br clear="none"> <br clear="none"> Hank,<br clear="none"> It's not crazy at all. I just<br clear="none"> hadn't<br clear="none"> thought of it. I wonder if the<br clear="none"> stresses<br clear="none"> imposed at test<br clear="none"> depth would be too high<br clear="none"> for the 1/4" hull the thing<br clear="none"> would be<br clear="none"> welded to. It's an interesting thought,<br clear="none"> <br clear="none"> though.<br clear="none"> Something to consider,<br clear="none"> definitely.<br clear="none"> <br clear="none"> Vance<br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> -----Original<br clear="none"> <br clear="none"> Message-----<br clear="none"> <br clear="none">
From:<br clear="none"> hank pronk via Personal_Submersibles<br clear="none"> <br clear="none"> <<a href="mailto:personal_submersibles@psubs.org" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> <br clear="none"> To:<br clear="none"> personal_submersibles<br clear="none"> <<a href="mailto:personal_submersibles@psubs.org" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> <br clear="none"> Sent: Sun, Nov 2, 2014<br clear="none"> 10:49 am<br clear="none"> <br clear="none"> Subject:<br clear="none"> [PSUBS-MAILIST] bow window<br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br
clear="none"> <br clear="none"> Vance,<br clear="none"> Have you looked at a large full<br clear="none"> size flat port for the<br clear="none"> front<br clear="none"> of your K350. I <br clear="none"> did<br clear="none"> that with one of my early subs. I had a 24 inch flat<br clear="none"> port 4 inches thick <br clear="none"> with<br clear="none"> a 24 inch protection dome. The optics were stunning,<br clear="none"> nobody believed it <br clear="none"> was 4<br clear="none"> inches thick. I checked with<br clear="none"> Reynolds Polymer and a<br clear="none"> 7<br clear="none"> inch thick 37inch <br clear="none"> square<br clear="none"> unpolished piece is 3,000 dollars US. Is that just<br clear="none"> crazy talk or what. <br clear="none"> <br clear="none"> Hank<br clear="none"> <br clear="none">
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