[PSUBS-MAILIST] Gamma needs a diet

Sat May 17 19:07:01 EDT 2014

Jim,
Honestly I do not know the volume of my MBT's
I fill the mbt's entirely except for 1 imperial gallon (10 lbs)
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, 6:58 PM

 Hank,
 What's the capacity of your MBTs
 (lbs or liters)?  
 In Gamma's present configuration, how many
 lbs or liters would you 
 have to take into your MBTs to reach neutral buoyancy
 with a standard 170 
 lb (77 kg) pilot (or any other convenient
 reference)?  Yeah, I'm a bit 
 over 'standard' too.
 Jim

 In a message dated 5/17/2014 5:35:13 P.M. Central
 Daylight Time, 
 personal_submersibles at psubs.org writes:

   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

   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

  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