[PSUBS-MAILIST] Gamma needs a diet

[hank pronk via Personal_Submersibles]

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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 >  
 >  
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