<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:14pt"><div><span>Thanks Paul,</span></div><div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><span>they must be using a powerful press for that dome forming process.</span></div><div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><span>Any more info when it comes would be appreciated.</span></div><div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent;
font-style: normal;"><span>Alan</span></div><div><br></div> <div style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 14pt;"> <div style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 12pt;"> <div dir="ltr"> <hr size="1"> <font size="2" face="Arial"> <b><span style="font-weight:bold;">From:</span></b> Paul Moorhouse <paul@steel-fish.com><br> <b><span style="font-weight: bold;">To:</span></b> 'PSUBS Member Discussion Group' <member-forum@psubs.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Thursday, March 27, 2014 11:05 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [Member-Forum] Moment of Inertia<br> </font> </div> <div class="y_msg_container"><br><div id="yiv1528533859"><style>#yiv1528533859 #yiv1528533859 --
_filtered #yiv1528533859 {font-family:Helvetica;panose-1:2 11 6 4 2 2 2 2 2 4;}
_filtered #yiv1528533859 {font-family:Helvetica;panose-1:2 11 6 4 2 2 2 2 2 4;}
_filtered #yiv1528533859 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;}
_filtered #yiv1528533859 {font-family:Tahoma;panose-1:2 11 6 4 3 5 4 4 2 4;}
#yiv1528533859
#yiv1528533859 p.yiv1528533859MsoNormal, #yiv1528533859 li.yiv1528533859MsoNormal, #yiv1528533859 div.yiv1528533859MsoNormal
{margin:0cm;margin-bottom:.0001pt;font-size:12.0pt;}
#yiv1528533859 a:link, #yiv1528533859 span.yiv1528533859MsoHyperlink
{color:blue;text-decoration:underline;}
#yiv1528533859 a:visited, #yiv1528533859 span.yiv1528533859MsoHyperlinkFollowed
{color:purple;text-decoration:underline;}
#yiv1528533859 p.yiv1528533859MsoAcetate, #yiv1528533859 li.yiv1528533859MsoAcetate, #yiv1528533859 div.yiv1528533859MsoAcetate
{margin:0cm;margin-bottom:.0001pt;font-size:8.0pt;}
#yiv1528533859 span.yiv1528533859apple-style-span
{}
#yiv1528533859 span.yiv1528533859BalloonTextChar
{}
#yiv1528533859 span.yiv1528533859EmailStyle20
{color:#1F497D;}
#yiv1528533859 .yiv1528533859MsoChpDefault
{}
_filtered #yiv1528533859 {margin:72.0pt 72.0pt 72.0pt 72.0pt;}
#yiv1528533859 div.yiv1528533859WordSection1
{}
#yiv1528533859 </style><div><div class="yiv1528533859WordSection1"><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;">Hi Douglas</span></div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;">The traditional method was to cast using a slush of polymerised powder and liquid resin to keep the exotherm heat under control. The moulds were often quite rudimentary and the shrinkage large so massive over thickness is required to get what you want out of the casting. The thicker it is the more difficult it is to keep to a cooling rate that will not cause cracks. Once it has cracked, it is scrap. This is quite a contrast to how the material behaves at normal diving temperatures where it is extremely forgiving and in some configurations will extrude in preference to cracking. During the Alicia development we did a series of destructive model tests and the acrylic is definitely the toughest part of the submarine. We had an
instrumentation cable port in the top of the test chamber that lead the wires out from the strain gauges on the inside surface of the test sphere. When they went bang at around 2,500 metres bits of acrylic came out of this ¾ hole and went clean through the roof of the building. We had to make a plastic plug to keep the debris inside the chamber. </span></div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;"> </span></div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;">The German company making spheres for Triton are holding their cards close to their chest right now. I am hoping to be able to write about it when they they feel the time is right but for now the details remain under wraps. What I can tell you is they start with cell cast blocks over 200mm thick that have been slow polymerised under closely controlled conditions from 100% liquid. This increases the length of the polymer chains with superior
mechanical properties as a result. These blocks are then heated and slowly squeezed between two metal formers to create the basic hemispheres. After machining and polishing the two hemispheres are bonded together using another new technique that produces a bond that is almost invisible and defect free. </span></div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;"> </span></div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;">The new spheres are quite definitely the best that have ever been made. </span></div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;"> </span></div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;">Paul</span></div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;"> </span></div><div class="yiv1528533859MsoNormal"><b><span style="font-size:11.0pt;">Paul Moorhouse</span></b></div><div
class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;">Design Engineer</span></div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;"><a rel="nofollow" shape="rect" ymailto="mailto:paul@steel-fish.com" target="_blank" href="mailto:paul@steel-fish.com"><span style="color:blue;">paul@steel-fish.com</span></a></span></div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;"><a rel="nofollow" shape="rect" target="_blank" href="http://www.steel-fish.com/"><span style="color:blue;">www.steel-fish.com</span></a></span></div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;">#44 7837 542878</span></div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;"> </span></div><div class="yiv1528533859yqt2566588055" id="yiv1528533859yqt61834"><div class="yiv1528533859MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;">From:</span></b><span lang="EN-US" style="font-size:10.0pt;">
Member-Forum [mailto:member-forum-bounces@psubs.org] <b>On Behalf Of </b>Douglas Suhr<br clear="none"><b>Sent:</b> 26 March 2014 23:48<br clear="none"><b>To:</b> Dan Still; PSUBS Member Discussion Group<br clear="none"><b>Subject:</b> Re: [Member-Forum] Moment of Inertia</span></div><div class="yiv1528533859MsoNormal"> </div><div><div><div class="yiv1528533859MsoNormal"><span style="font-size:14.5pt;">"Hi Paul,</span></div></div><div><div class="yiv1528533859MsoNormal"><span class="yiv1528533859apple-style-span"><span style="font-size:14.5pt;">can you tell us a bit more about the thermo forming of the 165mm sphere" </span></span></div></div><div><div class="yiv1528533859MsoNormal"> </div></div><div><div class="yiv1528533859MsoNormal">I too am interested in hearing more about how such a thick personnel sphere is manufactured. Sounds like a daunting and frustrating task (with the multiple failures mentioned). ~ Douglas
S. </div></div></div></div><div><div class="yiv1528533859yqt2566588055" id="yiv1528533859yqt47679"><div class="yiv1528533859MsoNormal" style="margin-bottom:12.0pt;"> </div><div><div class="yiv1528533859MsoNormal">On Wed, Mar 26, 2014 at 9:17 AM, Dan Still <<a rel="nofollow" shape="rect" ymailto="mailto:stillphototheater@yahoo.com" target="_blank" href="mailto:stillphototheater@yahoo.com">stillphototheater@yahoo.com</a>> wrote:</div><div><div><div><div class="yiv1528533859MsoNormal"><span style="">Anything with chips in them hate humans.</span></div></div><div><div class="yiv1528533859MsoNormal" style="margin-bottom:12.0pt;"><span style=""> </span></div><div><div><div><div><div><div class="yiv1528533859MsoNormal"><span style="">On Wednesday, March 26, 2014 7:29 AM, Joe Perkel <<a rel="nofollow" shape="rect" ymailto="mailto:josephperkel@yahoo.com" target="_blank" href="mailto:josephperkel@yahoo.com">josephperkel@yahoo.com</a>>
wrote:</span><span style=""></span></div></div></div></div><div><div><div><div><div><table class="yiv1528533859MsoNormalTable" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td colspan="1" rowspan="1" valign="top" style="padding:0cm 0cm 0cm 0cm;"><div class="yiv1528533859MsoNormal">Wow, 24+ hours for email delivery and doubled to boot. <br clear="none"><br clear="none">Can iPads go insane?<br clear="none"><br clear="none">Joe<a rel="nofollow" shape="rect" target="_blank" href="http://overview.mail.yahoo.com/?.src=iOS"><br clear="none"><br clear="none">Sent from Yahoo Mail for iPad</a></div></td></tr></tbody></table><div><div><div><div class="yiv1528533859MsoNormal"><span style=""> </span></div><div><div><div align="center" class="yiv1528533859MsoNormal" style="text-align:center;"><span style="font-size:11.0pt;"></span><hr align="center" size="1" width="100%"></div><div class="yiv1528533859MsoNormal"><b><span style="font-size:11.0pt;">From:
</span></b><span style="font-size:11.0pt;">Joe Perkel <<a rel="nofollow" shape="rect" ymailto="mailto:josephperkel@yahoo.com" target="_blank" href="mailto:josephperkel@yahoo.com">josephperkel@yahoo.com</a>>; <br clear="none"><b>To: </b><a rel="nofollow" shape="rect" ymailto="mailto:member-forum@psubs.org" target="_blank" href="mailto:member-forum@psubs.org">member-forum@psubs.org</a> <<a rel="nofollow" shape="rect" ymailto="mailto:member-forum@psubs.org" target="_blank" href="mailto:member-forum@psubs.org">member-forum@psubs.org</a>>; <br clear="none"><b>Subject: </b>Re: [Member-Forum] Moment of Inertia <br clear="none"><b>Sent: </b>Tue, Mar 25, 2014 4:00:01 PM </span></div></div><div class="yiv1528533859MsoNormal"><span style=""> </span></div><table class="yiv1528533859MsoNormalTable" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td colspan="1" rowspan="1" valign="top" style="padding:0cm 0cm 0cm 0cm;"><table
class="yiv1528533859MsoNormalTable" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td colspan="1" rowspan="1" valign="top" style="padding:0cm 0cm 0cm 0cm;"><div class="yiv1528533859MsoNormal">Hi Paul,<br clear="none"><br clear="none">The question is anecdotal based on an off the cuff thought of upsizing the shell O.D. to 42" from 36". I am very hesitant to do this do to weight and handling issues however, several members have made a compelling rationale r/t simple comfort. At 53 I'm 6' 190 lbs and should expect that L to W ratio to change by build time! <br clear="none"><br clear="none">I have to think a bit about the shell thickness r/t welding and corrosion issues, but Depth no more than 350'. I seem to remember a cross section drawing of a T section somewhere with a simple L/W/H relationship to shell T, but can't find it again. <br clear="none"><br clear="none">I'll take that pdf if you don't mind. I'm not at home and won't be until later
this week to do some number crunching.<br clear="none"><br clear="none">Thanks Paul!<br clear="none"><br clear="none"><br clear="none">Joe<br clear="none"><br clear="none">Sent from Yahoo Mail for iPad<a rel="nofollow" shape="rect" target="_blank" href="http://overview.mail.yahoo.com/?.src=iOS"><br clear="none"><br clear="none">Sent from Yahoo Mail for iPad</a></div></td></tr></tbody></table><div><div><div><div class="yiv1528533859MsoNormal"> </div><div><div><div align="center" class="yiv1528533859MsoNormal" style="text-align:center;"><span style="font-size:11.0pt;"></span><hr align="center" size="1" width="100%"></div><div class="yiv1528533859MsoNormal"><b><span style="font-size:11.0pt;">From: </span></b><span style="font-size:11.0pt;">Paul Moorhouse <<a rel="nofollow" shape="rect" ymailto="mailto:paul@steel-fish.com" target="_blank" href="mailto:paul@steel-fish.com">paul@steel-fish.com</a>>; <br clear="none"><b>To: </b>'PSUBS Member
Discussion Group' <<a rel="nofollow" shape="rect" ymailto="mailto:member-forum@psubs.org" target="_blank" href="mailto:member-forum@psubs.org">member-forum@psubs.org</a>>; <br clear="none"><b>Subject: </b>Re: [Member-Forum] Moment of Inertia <br clear="none"><b>Sent: </b>Tue, Mar 25, 2014 9:10:06 AM </span></div></div><div class="yiv1528533859MsoNormal"> </div><table class="yiv1528533859MsoNormalTable" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td colspan="1" rowspan="1" valign="top" style="padding:0cm 0cm 0cm 0cm;"><div><div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;">Joe</span></div></div><div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;">As it happens, this is my day job. I have been designing submarine pressure vessels for the last 28 years. I am sure there are others on the forum who do this but I am happy to help if you would like, and others at PSUBS should the need arise.
</span></div></div><div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;">Frame size and spacing is inter-related and there is no one answer. I have developed some models based on the European pressure vessel code PD5500 so running a new configuration is easy and surprisingly quick. PD5500 produces much lighter vessels than ASME VIII which is really aimed at chemical plant. In this way it is more similar to military codes but it does rely on quality assurance levels that do not generally come with home construction. So to cater for this, you put a factor in. I apologise in advance for all of the calculations being in metric but give me info in either. </span></div></div><div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;">I would need to know</span></div></div><div style="margin-left:38.4pt;"><div class="yiv1528533859MsoNormal"><span style="font-size: 11pt; font-family: Symbol; color: rgb(31, 73,
125);">·</span><span style="font-size: 7pt; font-family: Symbol; color: rgb(31, 73, 125);"> </span><span style="font-size:11.0pt;">Outside diameter</span></div></div><div style="margin-left:38.4pt;"><div class="yiv1528533859MsoNormal"><span style="font-size: 11pt; font-family: Symbol; color: rgb(31, 73, 125);">·</span><span style="font-size: 7pt; font-family: Symbol; color: rgb(31, 73, 125);"> </span><span style="font-size:11.0pt;">Shell thickness</span></div></div><div style="margin-left:38.4pt;"><div class="yiv1528533859MsoNormal"><span style="font-size: 11pt; font-family: Symbol; color: rgb(31, 73, 125);">·</span><span style="font-size: 7pt; font-family: Symbol; color: rgb(31, 73, 125);"> </span><span style="font-size:11.0pt;">Shell material </span></div></div><div style="margin-left:38.4pt;"><div
class="yiv1528533859MsoNormal"><span style="font-size: 11pt; font-family: Symbol; color: rgb(31, 73, 125);">·</span><span style="font-size: 7pt; font-family: Symbol; color: rgb(31, 73, 125);"> </span><span style="font-size:11.0pt;">Frame material</span></div></div><div style="margin-left:38.4pt;"><div class="yiv1528533859MsoNormal"><span style="font-size: 11pt; font-family: Symbol; color: rgb(31, 73, 125);">·</span><span style="font-size: 7pt; font-family: Symbol; color: rgb(31, 73, 125);"> </span><span style="font-size:11.0pt;">Diving depth</span></div></div><div style="margin-left:38.4pt;"><div class="yiv1528533859MsoNormal"><span style="font-size: 11pt; font-family: Symbol; color: rgb(31, 73, 125);">·</span><span style="font-size: 7pt; font-family: Symbol; color: rgb(31, 73, 125);"> </span><span
style="font-size:11.0pt;">Length of parallel body</span></div></div><div style="margin-left:38.4pt;"><div class="yiv1528533859MsoNormal"><span style="font-size: 11pt; font-family: Symbol; color: rgb(31, 73, 125);">·</span><span style="font-size: 7pt; font-family: Symbol; color: rgb(31, 73, 125);"> </span><span style="font-size:11.0pt;">Ends, hemi or 2:1 dished.</span></div></div><div style="margin-left:38.4pt;"><div class="yiv1528533859MsoNormal"><span style="font-size: 11pt; font-family: Symbol; color: rgb(31, 73, 125);">·</span><span style="font-size: 7pt; font-family: Symbol; color: rgb(31, 73, 125);"> </span><span style="font-size:11.0pt;">Preferred frame spacing </span></div></div><div style="margin-left:38.4pt;"><div class="yiv1528533859MsoNormal"><span style="font-size: 11pt; font-family: Symbol; color: rgb(31, 73, 125);">·</span><span style="font-size: 7pt;
font-family: Symbol; color: rgb(31, 73, 125);"> </span><span style="font-size:11.0pt;">Inside or outside frames</span></div></div><div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;">I can send you the PDF of the work sheet as the PD5500 sums do look very pretty. </span></div></div><div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;">The next step is to design the hatch penetration and I can help you here also. </span></div></div><div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;"> </span></div></div><div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;">This guy can thermo form your acrylic</span></div></div><div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;"><a rel="nofollow" shape="rect" target="_blank" href="http://www.airesearch.nl/">http://www.airesearch.nl/</a></span></div></div><div><div
class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;"> </span></div></div><div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;"> </span></div></div><div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;">Regards</span></div></div><div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;">Paul</span></div></div><div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;"> </span></div></div><div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;">Paul Moorhouse</span></div></div><div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;"><a rel="nofollow" shape="rect" target="_blank" href="http://www.steel-fish.com/">www.steel-fish.com</a></span></div></div><div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;"> </span></div></div><div><div class="yiv1528533859MsoNormal"><span
style="font-size:11.0pt;"> </span></div></div><div><div class="yiv1528533859MsoNormal"><span style="font-size:11.0pt;"> </span></div></div><div><div><div class="yiv1528533859MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;">From:</span></b><span lang="EN-US" style="font-size:10.0pt;"> Member-Forum [mailto:<a rel="nofollow" shape="rect" ymailto="mailto:member-forum-bounces@psubs.org" target="_blank" href="mailto:member-forum-bounces@psubs.org">member-forum-bounces@psubs.org</a>] <b>On Behalf Of </b>Joe Perkel<br clear="none"><b>Sent:</b> 25 March 2014 03:55<br clear="none"><b>To:</b> PSUBS Member Discussion Group<br clear="none"><b>Subject:</b> [Member-Forum] Moment of Inertia</span></div></div><div><div class="yiv1528533859MsoNormal"> </div></div><table class="yiv1528533859MsoNormalTable" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td colspan="1" rowspan="1" valign="top" style="padding:0cm 0cm 0cm 0cm;"><div><div
class="yiv1528533859MsoNormal">Where did I see the rule of thumb for T-section rib sizing relative to shell thickness? I can't seem to find it now.<br clear="none"><br clear="none">Joe<a rel="nofollow" shape="rect" target="_blank" href="http://overview.mail.yahoo.com/?.src=iOS"><br clear="none"><br clear="none">Sent from Yahoo Mail for iPad</a></div></div></td></tr></tbody></table></div><div><div class="yiv1528533859MsoNormal"><span style="font-size:10.0pt;"> </span></div></div></div></td></tr></tbody></table></div></div></div></div></td></tr></tbody></table></div></div></div></div></div></div><div class="yiv1528533859MsoNormal"><span style=""> </span></div></div></div><div><div><div class="yiv1528533859MsoNormal"><span style="">_______________________________________________<br clear="none">Member-Forum mailing list<br clear="none"><a rel="nofollow" shape="rect" ymailto="mailto:Member-Forum@psubs.org" target="_blank"
href="mailto:Member-Forum@psubs.org">Member-Forum@psubs.org</a><br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/member-forum">http://www.psubs.org/mailman/listinfo.cgi/member-forum</a></span></div></div><div class="yiv1528533859MsoNormal" style="margin-bottom:12.0pt;"><span style=""> </span></div></div></div></div></div></div></div></div><div class="yiv1528533859MsoNormal" style="margin-bottom:12.0pt;"><br clear="none">_______________________________________________<br clear="none">Member-Forum mailing list<br clear="none"><a rel="nofollow" shape="rect" ymailto="mailto:Member-Forum@psubs.org" target="_blank" href="mailto:Member-Forum@psubs.org">Member-Forum@psubs.org</a><br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/member-forum">http://www.psubs.org/mailman/listinfo.cgi/member-forum</a></div></div></div><div
class="yiv1528533859MsoNormal"> </div></div></div></div></div><br><div class="yqt2566588055" id="yqt03909">_______________________________________________<br clear="none">Member-Forum mailing list<br clear="none"><a shape="rect" ymailto="mailto:Member-Forum@psubs.org" href="mailto:Member-Forum@psubs.org">Member-Forum@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/member-forum" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/member-forum</a><br clear="none"></div><br><br></div> </div> </div> </div></body></html>