[PSUBS-MAILIST] Gamma needs a diet

via Personal_Submersibles personal_submersibles at psubs.org
Sat May 17 19:26:37 EDT 2014 

Hank,
Here's a chart for a starting point: 
http://www.diabgroup.com/~/media/Files/Products/Core-material-pdf/BMTI%20Sel
ection%20Guide%20-%20October%202013.pdf
Cliff used it somewhat in the R-300.  I don't have hands-on  experience.  
This search will give you a bunch of other links:
http://search.aol.com/aol/search?enabled_terms=&s_it=wscreen-smallbusiness-w
&q=density+of+syntactic+foam
Jim
 
 
In a message dated 5/17/2014 6:17:39 P.M. Central Daylight Time,  
personal_submersibles at psubs.org writes:

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.  
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

 
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