[PSUBS-MAILIST] Gamma needs a diet

via Personal_Submersibles personal_submersibles at psubs.org
Sat May 17 19:11:07 EDT 2014 

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.   Go
bigger than you
need to

accommodate future expansion,  and compensate in the
meantime
with keel
weight.   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
positioning 
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:

   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
  
  Hank,a
   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
 
them & clip them on or off.Alan
   
 
      
   From: hank  pronk via
   Personal_Submersibles
 
<personal_submersibles at psubs.org>
   To:
 
personal_submersibles at psubs.org

   Sent: Friday,
  May 16, 2014 12:04  PM
   Subject:
  [PSUBS-MAILIST] Gamma needs a  diet
 
   
  Gamma or the pilot needs  to go to
Jenny
Craig.  My new
 
AGM batteries  weigh 73 lbs each and Gamma has a
60 to 65 lb
 
weight  budget, per battery. That means Gamma
needs to  shed
 
some lbs before I can take a passenger.  I
can switch
 
to aluminum scuba tanks, not sure the  weight
saving
 
there.  I can make an aluminum  rudder and a
few other
 
parts also.
   Hank

 
Personal_Submersibles mailing  list
 
Personal_Submersibles at psubs.org
Â!
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
   
  
      
 
-----Inline Attachment  Follows-----
  

  Personal_Submersibles mailing  list
 
Personal_Submersibles at psubs.org
   http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
   


Personal_Submersibles
mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles


Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
!



Personal_Submersibles mailing  list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

-----Inline  Attachment  Follows-----

_______________________________________________
Personal_Submersibles  mailing  list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles


_______________________________________________
Personal_Submersibles  mailing  list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20140517/f069bfe8/attachment.html>

More information about the Personal_Submersibles mailing list