<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12pt"><div><span>Anything with chips in them hate humans.</span></div><div class="yahoo_quoted" style="display: block; "> <br> <br> <div style="font-size: 12pt; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; "> <div style="font-size: 12pt; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; "> <div dir="ltr"> <font size="2" face="Arial"> On Wednesday, March 26, 2014 7:29 AM, Joe Perkel <josephperkel@yahoo.com> wrote:<br> </font> </div> <div class="y_msg_container"><div id="yiv6220468277"><div><table cellspacing="0" cellpadding="0" border="0"><tbody><tr><td colspan="1" rowspan="1" valign="top">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></td></tr></tbody></table> <div class="yiv6220468277yqt6149072386" id="yiv6220468277yqt71033"><div id="yiv6220468277_origMsg_">
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<span style="font-weight:bold;">From:</span>
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Joe Perkel <josephperkel@yahoo.com>; <br clear="none">
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member-forum@psubs.org <member-forum@psubs.org>; <br clear="none">
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<span style="font-weight:bold;">Subject:</span>
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Re: [Member-Forum] Moment of Inertia <br clear="none">
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Tue, Mar 25, 2014 4:00:01 PM <br clear="none">
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<table cellspacing="0" cellpadding="0" border="0"><tbody><tr><td colspan="1" rowspan="1" valign="top"><table cellspacing="0" cellpadding="0" border="0"><tbody><tr><td colspan="1" rowspan="1" valign="top">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></td></tr></tbody></table> <div class="yiv6220468277yqt9904229422" id="yiv6220468277yqt00754"><div id="yiv6220468277_origMsg_">
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<span style="font-weight:bold;">From:</span>
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Paul Moorhouse <paul@steel-fish.com>; <br clear="none">
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<span style="font-weight:bold;">To:</span>
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'PSUBS Member Discussion Group' <member-forum@psubs.org>; <br clear="none">
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Re: [Member-Forum] Moment of Inertia <br clear="none">
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Tue, Mar 25, 2014 9:10:06 AM <br clear="none">
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<table cellspacing="0" cellpadding="0" border="0"><tbody><tr><td colspan="1" rowspan="1" valign="top"><div class="yiv6220468277WordSection1"><div class="yiv6220468277MsoNormal"><span style="font-size:11.0pt;">Joe</span></div><div class="yiv6220468277MsoNormal"><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 class="yiv6220468277MsoNormal"><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 class="yiv6220468277MsoNormal"><span style="font-size:11.0pt;">I would need to know</span></div><div class="yiv6220468277MsoListParagraph" style="margin-left:38.4pt;"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Symbol; "><span style="">·<span style="font:7.0pt;"> </span></span></span><span style="font-size:11.0pt;">Outside diameter</span></div><div class="yiv6220468277MsoListParagraph" style="margin-left:38.4pt;"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Symbol; "><span style="">·<span style="font:7.0pt;"> </span></span></span><span style="font-size:11.0pt;">Shell thickness</span></div><div class="yiv6220468277MsoListParagraph" style="margin-left:38.4pt;"><span
style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Symbol; "><span style="">·<span style="font:7.0pt;"> </span></span></span><span style="font-size:11.0pt;">Shell material </span></div><div class="yiv6220468277MsoListParagraph" style="margin-left:38.4pt;"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Symbol; "><span style="">·<span style="font:7.0pt;"> </span></span></span><span style="font-size:11.0pt;">Frame material</span></div><div class="yiv6220468277MsoListParagraph" style="margin-left:38.4pt;"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Symbol; "><span style="">·<span style="font:7.0pt;"> </span></span></span><span style="font-size:11.0pt;">Diving depth</span></div><div class="yiv6220468277MsoListParagraph" style="margin-left:38.4pt;"><span style="font-size: 11pt;
color: rgb(31, 73, 125); font-family: Symbol; "><span style="">·<span style="font:7.0pt;"> </span></span></span><span style="font-size:11.0pt;">Length of parallel body</span></div><div class="yiv6220468277MsoListParagraph" style="margin-left:38.4pt;"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Symbol; "><span style="">·<span style="font:7.0pt;"> </span></span></span><span style="font-size:11.0pt;">Ends, hemi or 2:1 dished.</span></div><div class="yiv6220468277MsoListParagraph" style="margin-left:38.4pt;"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Symbol; "><span style="">·<span style="font:7.0pt;"> </span></span></span><span style="font-size:11.0pt;">Preferred frame spacing </span></div><div class="yiv6220468277MsoListParagraph" style="margin-left:38.4pt;"><span
style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Symbol; "><span style="">·<span style="font:7.0pt;"> </span></span></span><span style="font-size:11.0pt;">Inside or outside frames</span></div><div class="yiv6220468277MsoNormal"><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 class="yiv6220468277MsoNormal"><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 class="yiv6220468277MsoNormal"><span style="font-size:11.0pt;"> </span></div><div class="yiv6220468277MsoNormal"><span style="font-size:11.0pt;">This guy can thermo form your acrylic</span></div><div class="yiv6220468277MsoNormal"><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 class="yiv6220468277MsoNormal"><span style="font-size:11.0pt;"> </span></div><div class="yiv6220468277MsoNormal"><span style="font-size:11.0pt;"> </span></div><div class="yiv6220468277MsoNormal"><span style="font-size:11.0pt;">Regards</span></div><div class="yiv6220468277MsoNormal"><span style="font-size:11.0pt;">Paul</span></div><div class="yiv6220468277MsoNormal"><span style="font-size:11.0pt;"> </span></div><div class="yiv6220468277MsoNormal"><span style="font-size:11.0pt;">Paul Moorhouse</span></div><div class="yiv6220468277MsoNormal"><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 class="yiv6220468277MsoNormal"><span style="font-size:11.0pt;"> </span></div><div class="yiv6220468277MsoNormal"><span style="font-size:11.0pt;">
</span></div><div class="yiv6220468277MsoNormal"><span style="font-size:11.0pt;"> </span></div><div class="yiv6220468277yqt0458768001" id="yiv6220468277yqt88593"><div class="yiv6220468277MsoNormal"><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>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 class="yiv6220468277MsoNormal"> </div><table class="yiv6220468277MsoNormalTable" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td colspan="1" rowspan="1" valign="top" style="padding:0cm 0cm 0cm 0cm;"><div class="yiv6220468277MsoNormal">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></td></tr></tbody></table></div><div class="yiv6220468277MsoNormal"><span style="font-size:10.0pt;"> </span></div></div></td></tr></tbody></table>
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