[PSUBS-MAILIST] Gamma needs a diet
hank pronk via Personal_Submersibles
personal_submersibles at psubs.org
Sat May 17 19:17:12 EDT 2014
Jim,
What kind of numbers are we talking here. How much volume of foam per lb of buoyancy.
Hank
--------------------------------------------
On Sat, 5/17/14, via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
Subject: Re: [PSUBS-MAILIST] Gamma needs a diet
To: personal_submersibles at psubs.org
Received: Saturday, May 17, 2014, 7:11 PM
Hank,
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.
Jim
In a message dated 5/17/2014 6:04:36 P.M. Central
Daylight Time,
personal_submersibles at psubs.org writes:
Sean,
Very interesting, I just googled glass microspheres and
this is very
doable.
Hank
--------------------------------------------
On Sat,
5/17/14, Sean T. Stevenson via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:
Subject: Re:
[PSUBS-MAILIST] Gamma needs a diet
To: "Personal Submersibles General
Discussion" <personal_submersibles at psubs.org>
Received: Saturday, May
17, 2014, 6:34 PM
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.
Sean
On May 17, 2014
4:09:46 PM MDT, hank
pronk via Personal_Submersibles
<personal_submersibles at psubs.org>
wrote:
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.
Hank
On Fri,
5/16/14, Sean T. Stevenson via
Personal_Submersibles
<personal_submersibles at psubs.org>
wrote:
Subject: Re: [PSUBS-MAILIST] Gamma needs a diet
To:
"Personal Submersibles General
Discussion"
<personal_submersibles at psubs.org>
Received:
Friday, May 16, 2014, 7:12 PM
There's
always the not-so-easy but
very elegant solution
of
syntactic
foam filled hydrodynamic fairings.Â
Go
bigger than you
need to
accommodate future expansion,
and compensate in the
meantime
with keel
weight.Â
Would improve
stability, too.
Sean
On
2014-05-15 18:51, hank pronk via
Personal_Submersibles
wrote:
Alan,
That would work
but
I want to keep the sub clean on the
outside. Gamma is
very slippery the way it is. I
am confident I can shed the
weight. I have been
weighing all the bits and it looks
doable. I am also
looking at a winter project for
Gamma. I would like
to
have the arm, and valve and a
couple of
positioningÂ
thrusters on a common chassis,
like
the DW's. I could
reduce the weight of the
lead
drop weight because the entire
assembly would be
the drop
weight. That also solves
the weight
problem from the
batteries. I would use the
original drop weight screw to
drop the new assembly.
Hank
On Thu,
5/15/14, Alan
James via Personal_Submersibles
<personal_submersibles at psubs.org>
wrote:
Â
Subject: Re:
[PSUBS-MAILIST] Gamma needs a diet
 To:
"Personal
Submersibles General Discussion"
<personal_submersibles at psubs.org>
 Received: Thursday, May
15,
2014, 8:17 PM
Â
 Hank,a
Â
simple
solution would be to just have a
 number of floats
like
Alec's Snoopy.He
 has them in a tube, but
if the floats
had
attachment ho!
les
 you
couldtether
Â
them & clip them on or off.Alan
Â
Â
  Â
   From: hank
pronk via
Â
Personal_Submersibles
Â
<personal_submersibles at psubs.org>
   To:
Â
personal_submersibles at psubs.org
   Sent: Friday,
 May 16, 2014 12:04
PM
   Subject:
 [PSUBS-MAILIST] Gamma needs a
diet
Â
  Â
 Gamma or the pilot needs
to go to
Jenny
Craig. My new
Â
AGM batteries
weigh 73 lbs each and Gamma has a
60 to 65 lb
Â
weight
budget, per battery. That means Gamma
needs to
shed
Â
some lbs before I can take a passenger. I
can switch
Â
to aluminum scuba tanks, not sure the
weight
saving
Â
there. I can make an aluminum
rudder and a
few other
Â
parts also.
Â
Hank
Â
Personal_Submersibles mailing
list
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Personal_Submersibles at psubs.org
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