<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1447268820803_18233"><span id="yui_3_16_0_1_1447268820803_18688">Sean,</span></div><div id="yui_3_16_0_1_1447268820803_18222"><span id="yui_3_16_0_1_1447268820803_18231">I just put it through the Deep Sea Power & Light program which</span></div><div dir="ltr" id="yui_3_16_0_1_1447268820803_18230"><span id="yui_3_16_0_1_1447268820803_18229">has basic geometries & a materials list with epoxy / fiberglass.</span></div><div dir="ltr" id="yui_3_16_0_1_1447268820803_18230">I had spent a lot of time a couple of years ago, researching the building<br></div><div dir="ltr" id="yui_3_16_0_1_1447268820803_18228"><span id="yui_3_16_0_1_1447268820803_18454">of a fiberglass 1atm sub. The E glass / epoxy combination was the best</span></div><div dir="ltr" id="yui_3_16_0_1_1447268820803_18228"><span id="yui_3_16_0_1_1447268820803_18633">(including price) for compressive strength.</span></div><div dir="ltr" id="yui_3_16_0_1_1447268820803_18228"><span id="yui_3_16_0_1_1447268820803_19358">Those carbon fiber pressure vessels are wound so a different kettle of fish.</span></div><div dir="ltr" id="yui_3_16_0_1_1447268820803_18228"><span id="yui_3_16_0_1_1447268820803_19474">Graham Hawke did a carbon fiber wound submarine pressure hull at one stage.</span></div><div dir="ltr" id="yui_3_16_0_1_1447268820803_18228"><span id="yui_3_16_0_1_1447268820803_19359">They do have carbon fiber masts which are both under compression & tension,</span></div><div dir="ltr" id="yui_3_16_0_1_1447268820803_18228"><span id="yui_3_16_0_1_1447268820803_19360">so the compressive strength can't be too bad.</span></div><div dir="ltr" id="yui_3_16_0_1_1447268820803_18228"><span>Alan</span></div><div dir="ltr" id="yui_3_16_0_1_1447268820803_18228"><span id="yui_3_16_0_1_1447268820803_19362"> </span></div><br> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1447268820803_18225"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1447268820803_18224"> <div dir="ltr" id="yui_3_16_0_1_1447268820803_18223"> <hr size="1" id="yui_3_16_0_1_1447268820803_18234"> <font size="2" face="Arial" id="yui_3_16_0_1_1447268820803_18227"> <b><span style="font-weight:bold;">From:</span></b> Hugh Fulton 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> Thursday, November 12, 2015 8:44 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] buoyancy<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1447268820803_18226"><br>Sean,<br clear="none">We have a New Zealand developed programme for design that is widely used in<br clear="none">the pacific islands where Kiwis (NZ'ers) are involved. It covers piping,<br clear="none">fabrication, ditch digging, construction of most things. It is called<br clear="none">"TLAR". No guarantees go with it.<br clear="none">Hugh <br clear="none"><br clear="none"><br clear="none"><br clear="none">-----Original Message-----<br clear="none">From: Personal_Submersibles [mailto:<a shape="rect" ymailto="mailto:personal_submersibles-bounces@psubs.org" href="mailto:personal_submersibles-bounces@psubs.org">personal_submersibles-bounces@psubs.org</a>]<br clear="none">On Behalf Of Sean T. Stevenson via Personal_Submersibles<br clear="none">Sent: Thursday, 12 November 2015 8:26 a.m.<br clear="none">To: Personal Submersibles General Discussion<br clear="none">Subject: Re: [PSUBS-MAILIST] buoyancy<br clear="none"><br clear="none">Alan, how did you do that calculation? What layer count, thickness,<br clear="none">component volume fractions and principal fiber orientations did you use?<br clear="none"><br clear="none">Sean<br clear="none"><br clear="none"><br clear="none">On 2015-11-11 12:15, Alan James via Personal_Submersibles wrote:<br clear="none">> Hank,<br clear="none">> I did a quick calc on a sphere of nominal dimensions made of epoxy / <br clear="none">> fiberglass.<br clear="none">> With external pressure it had a depth of 4347ft, with internal 3785ft. <br clear="none">> I should have posted the results in psi, but you get the picture.<br clear="none">> The big thing to me would be that if you ruptured it by hitting <br clear="none">> anything, or so it failed, you would go down like a lead balloon.<br clear="none">> Alan<br clear="none"><br clear="none">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><div class="qtdSeparateBR"><br><br></div><div class="yqt2159376265" id="yqtfd88453"><br clear="none"><br clear="none">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div><br><br></div> </div> </div> </div></body></html>