[PSUBS-MAILIST] Gamma needs a diet

[Sean T. Stevenson via Personal_Submersibles]

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 holes
> >  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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> >  
> >  
> >      
> >  -----Inline Attachment Follows-----
> >  
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> >  
> >
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> >
> 
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