[PSUBS-MAILIST] Gamma needs a diet

hank pronk via Personal_Submersibles personal_submersibles at psubs.org
Sat May 17 19:04:12 EDT 2014 

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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