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<DIV><FONT size=3>Hank,</FONT></DIV>
<DIV><FONT size=3>What's the capacity of your MBTs (lbs or liters)?
In <EM>Gamma's</EM> present configuration, how many lbs or liters would you
have to take into your MBTs to reach neutral buoyancy with a standard 170
lb (77 kg) pilot (or any other convenient reference)? Yeah, I'm a bit
over 'standard' too.</FONT></DIV>
<DIV><FONT size=3>Jim</FONT></DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 5/17/2014 5:35:13 P.M. Central Daylight Time,
personal_submersibles@psubs.org writes:</DIV>
<BLOCKQUOTE
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<P dir=ltr>Hollow glass microspheres in a (typically) epoxy matrix. The
spheres are so small, they're more like a powder (for a deep / dense foam.
Shallower foams will incorporate larger spheres). Mix the composite with the
highest possible volume fraction of glass to resin.</P>
<P dir=ltr>Sean<BR></P><BR><BR>
<DIV class=gmail_quote>On May 17, 2014 4:09:46 PM MDT, hank pronk via
Personal_Submersibles <personal_submersibles@psubs.org> wrote:
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid"><PRE class=k9mail>How is syntactic foam made. I once experimented with 3/4inch plastic water line (pex pipe), the stuff we plumb houses with now. I heated the end of a piece and it melted shut nicely. So I planned to make a bunch of pipes with both ends melted shut then slide a bundle of them inside a pvc pipe. Then fill the void with poly urethane molding resin. It would be cheap and pretty tough. Perhaps an experiment is in order, unless there is a better idea out there.<BR>Hank<BR><HR><BR>On Fri, 5/16/14, Sean T. Stevenson via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<BR><BR> Subject: Re: [PSUBS-MAILIST] Gamma needs a diet<BR> To: "Personal Submersibles General Discussion" <personal_submersibles@psubs.org><BR> Received: Friday, May 16, 2014, 7:12 PM<BR> <BR> There's always the not-so-easy but<BR> very elegant solution of syntactic<BR> foam filled hydrodynamic fairings. Go bigger than you<BR> need to<BR>
accommodate future expansion, and compensate in the meantime<BR> with keel<BR> weight. Would improve stability, too.<BR> <BR> Sean<BR> <BR> <BR> On 2014-05-15 18:51, hank pronk via Personal_Submersibles<BR> wrote:<BR><BLOCKQUOTE class=gmail_quote style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 1ex 0.8ex; BORDER-LEFT: #729fcf 1px solid"> Alan,<BR> That would work but I want to keep the sub clean on the<BR></BLOCKQUOTE> outside. Gamma is very slippery the way it is. I<BR> am confident I can shed the weight. I have been<BR> weighing all the bits and it looks doable. I am also<BR> looking at a winter project for Gamma. I would like to<BR> have the arm, and valve and a couple of positioning <BR> thrusters on a common chassis, like the DW's. I could<BR> reduce the weight of the lead drop weight because the entire<BR> assembly would be the drop weight. That also solves<BR> the weight problem from the batteries. I would use the<BR>
original drop weight screw to drop the new assembly.<BR><BLOCKQUOTE class=gmail_quote style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 1ex 0.8ex; BORDER-LEFT: #729fcf 1px solid"> Hank<BR><HR><BR> On Thu, 5/15/14, Alan James via Personal_Submersibles<BR></BLOCKQUOTE> <personal_submersibles@psubs.org><BR> wrote:<BR><BLOCKQUOTE class=gmail_quote style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 1ex 0.8ex; BORDER-LEFT: #729fcf 1px solid"><BR> Subject: Re: [PSUBS-MAILIST] Gamma needs a diet<BR> To: "Personal Submersibles General Discussion"<BR></BLOCKQUOTE> <personal_submersibles@psubs.org><BR><BLOCKQUOTE class=gmail_quote style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 1ex 0.8ex; BORDER-LEFT: #729fcf 1px solid"> Received: Thursday, May 15, 2014, 8:17 PM<BR> <BR> Hank,a<BR> simple solution would be to just have a<BR> number of floats like Alec's Snoopy.He<BR> has them in a tube, but if the floats had<BR></BLOCKQUOTE> attachment holes<BR><BLOCKQUOTE class=gmail_quote style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 1ex 0.8ex; BORDER-LEFT: #729fcf 1px solid"> you couldtether<BR> them & clip them on or off.Alan<BR> <BR> <BR> From: hank pronk via<BR> Personal_Submersibles<BR> <personal_submersibles@psubs.org><BR> To:<BR> personal_submersibles@psubs.org<BR></BLOCKQUOTE> <BR><BLOCKQUOTE class=gmail_quote style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 1ex 0.8ex; BORDER-LEFT: #729fcf 1px solid"> Sent: Friday,<BR> May 16, 2014 12:04 PM<BR> Subject:<BR> [PSUBS-MAILIST] Gamma needs a diet<BR> <BR> Gamma or the pilot needs to go to Jenny<BR></BLOCKQUOTE> Craig. My new<BR><BLOCKQUOTE class=gmail_quote style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 1ex 0.8ex; BORDER-LEFT: #729fcf 1px solid"> AGM batteries weigh 73 lbs each and Gamma has a<BR></BLOCKQUOTE> 60 to 65 lb<BR><BLOCKQUOTE class=gmail_quote style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 1ex 0.8ex; BORDER-LEFT: #729fcf 1px solid"> weight budget, per battery. That means Gamma<BR></BLOCKQUOTE> needs to shed<BR><BLOCKQUOTE class=gmail_quote style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 1ex 0.8ex; BORDER-LEFT: #729fcf 1px solid"> some lbs before I can take a passenger. I<BR></BLOCKQUOTE> can switch<BR><BLOCKQUOTE class=gmail_quote style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 1ex 0.8ex; BORDER-LEFT: #729fcf 1px solid"> to aluminum scuba tanks, not sure the weight<BR></BLOCKQUOTE> saving<BR><BLOCKQUOTE class=gmail_quote style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 1ex 0.8ex; BORDER-LEFT: #729fcf 1px solid"> there. I can make an aluminum rudder and a<BR></BLOCKQUOTE> few other<BR><BLOCKQUOTE class=gmail_quote style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 1ex 0.8ex; BORDER-LEFT: #729fcf 1px solid"> parts also.<BR> Hank<BR><HR><BR> Personal_Submersibles mailing list<BR> Personal_Submersibles@psubs.org<BR> <A title=http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR> <BR> <BR> <BR> -----Inline Attachment Follows-----<BR> <BR><HR><BR> Personal_Submersibles mailing list<BR> Personal_Submersibles@psubs.org<BR> <A title=http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR> <BR><BR><HR><BR> Personal_Submersibles mailing list<BR> Personal_Submersibles@psubs.org<BR> <A title=http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A></BLOCKQUOTE><BR> <BR><HR><BR> Personal_Submersibles mailing list<BR> Personal_Submersibles@psubs.org<BR> <A title=http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR> <BR><BR><HR><BR>Personal_Submersibles mailing list<BR>Personal_Submersibles@psubs.org<BR><A title=http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR></PRE></BLOCKQUOTE></DIV><BR><BR>_______________________________________________<BR>Personal_Submersibles
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