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<DIV>Hank,</DIV>
<DIV>Greatest net buoyancy on your syntactic foam is achieved by mixing larger
spheres with smaller spheres so the smaller ones fit in the gaps between the
larger ones.</DIV>
<DIV>Jim</DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 5/17/2014 6:04:36 P.M. Central Daylight Time,
personal_submersibles@psubs.org writes:</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
style="BACKGROUND-COLOR: transparent" color=#000000 size=2
face=Arial>Sean,<BR>Very interesting, I just googled glass microspheres and
this is very
doable.<BR>Hank<BR>--------------------------------------------<BR>On Sat,
5/17/14, 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: Saturday, May
17, 2014, 6:34 PM<BR><BR>Hollow<BR>glass microspheres in a (typically) epoxy
matrix. The<BR>spheres are so small, they're more like a powder (for a<BR>deep
/ dense foam. Shallower foams will incorporate larger<BR>spheres). Mix the
composite with the highest possible volume<BR>fraction of glass to
resin.<BR>Sean<BR><BR><BR><BR><BR>On May 17, 2014<BR>4:09:46 PM MDT, hank
pronk via Personal_Submersibles<BR><personal_submersibles@psubs.org>
wrote:<BR>How is syntactic foam made.<BR> I once experimented with
3/4inch plastic water line (pex<BR>pipe), the stuff we plumb houses with now.
I heated the end<BR>of a piece and it melted shut nicely. So I planned
to make<BR>a bunch of pipes with both ends melted shut then slide a<BR>bundle
of them inside a pvc pipe. Then fill the void with<BR>poly urethane
molding resin. It would be cheap and pretty<BR>tough. Perhaps an
experiment is in order, unless there is a<BR>better idea out
there.<BR>Hank<BR><BR>On Fri,<BR>5/16/14, Sean T. Stevenson via
Personal_Submersibles<BR><personal_submersibles@psubs.org>
wrote:<BR><BR><BR>Subject: Re: [PSUBS-MAILIST] Gamma needs a diet<BR>
To:<BR>"Personal Submersibles General
Discussion"<BR><personal_submersibles@psubs.org><BR>
Received:<BR>Friday, May 16, 2014, 7:12 PM<BR> <BR>
There's<BR>always the not-so-easy but<BR> very elegant solution
of<BR>syntactic<BR> foam filled hydrodynamic fairings.Â
Go<BR>bigger than you<BR> need to<BR><BR>accommodate future expansion,
and compensate in the<BR>meantime<BR> with keel<BR> weight.Â
Would improve<BR>stability, too.<BR> <BR> Sean<BR>
<BR> <BR> On<BR>2014-05-15 18:51, hank pronk via
Personal_Submersibles<BR><BR>wrote:<BR> Alan,<BR> That would work
but<BR>I want to keep the sub clean on the<BR><BR>outside. Gamma is
very slippery the way it is. I<BR> am confident I can shed the
weight. I have been<BR><BR>weighing all the bits and it looks
doable. I am also<BR> looking at a winter project for
Gamma. I would like<BR>to<BR> have the arm, and valve and a
couple of<BR>positioning <BR> thrusters on a common chassis,
like<BR>the DW's. I could<BR> reduce the weight of the<BR>lead
drop weight because the entire<BR> assembly would be<BR>the drop
weight. That also solves<BR> the weight<BR>problem from the
batteries. I would use the<BR> <BR>original drop weight screw to
drop the new assembly.<BR> Hank<BR><BR> On Thu,<BR>5/15/14, Alan
James via Personal_Submersibles<BR>
<personal_submersibles@psubs.org><BR> wrote:<BR><BR>Â
Subject: Re:<BR>[PSUBS-MAILIST] Gamma needs a diet<BR>Â To:<BR>"Personal
Submersibles General Discussion"<BR>
<personal_submersibles@psubs.org><BR>Â Received: Thursday, May
15,<BR>2014, 8:17 PM<BR>Â <BR>Â Hank,a<BR>Â
simple<BR>solution would be to just have a<BR>Â number of floats<BR>like
Alec's Snoopy.He<BR>Â has them in a tube, but<BR>if the floats
had<BR> attachment ho!<BR> les<BR>Â you
couldtether<BR>Â <BR>them & clip them on or off.Alan<BR>Â
<BR>Â <BR>Â Â Â <BR>Â Â Â From: hank
pronk via<BR>Â
Personal_Submersibles<BR>Â <BR><personal_submersibles@psubs.org><BR>Â Â Â To:<BR>Â <BR>personal_submersibles@psubs.org<BR>
<BR>Â Â Â Sent: Friday,<BR>Â May 16, 2014 12:04
PM<BR>Â Â Â Subject:<BR>Â [PSUBS-MAILIST] Gamma needs a
diet<BR>Â <BR>Â Â Â <BR>Â Gamma or the pilot needs
to go to<BR>Jenny<BR> Craig. My new<BR> <BR>AGM batteries
weigh 73 lbs each and Gamma has a<BR> 60 to 65 lb<BR>Â <BR>weight
budget, per battery. That means Gamma<BR> needs to
shed<BR> <BR>some lbs before I can take a passenger. I<BR>
can switch<BR>Â <BR>to aluminum scuba tanks, not sure the
weight<BR> saving<BR> <BR>there. I can make an aluminum
rudder and a<BR> few other<BR>Â <BR>parts also.<BR>Â
Hank<BR><BR>Â <BR>Personal_Submersibles mailing
list<BR>Â <BR>Personal_Submersibles@psubs.org<BR>Â!<BR>
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles<BR>Â
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