[PSUBS-MAILIST] emergency lift bags

Thu Aug 14 17:25:49 EDT 2014

--------------------------------------------
Hugh,
At 600 ft I figure 480 cubic feet is needed to fill two lift bags with enough lift to bring Gamma up full of water.  I am probably over thinking again. :-)  I am making some changes after the convention to make Gamma more tangle resistant.  Gamma is already pretty good with the jettisoning arm and tail section. 
Hank  

 Subject: Re: [PSUBS-MAILIST] emergency lift bags
 To: "'Personal Submersibles General Discussion'" <personal_submersibles at psubs.org>
 Received: Thursday, August 14, 2014, 4:42 PM

 Hank, trouble is if you
 are at max depth the air won't go as far.  DW2000
 would be lucky to have 100 lbs of buoyancy
 (figuratively speaking). They
 work on plan
 B.
 Another side of the problem is that if
 you are caught by the tail and you
 blow
 tanks then you have to see that the tanks will work at a
 reasonably
 steep angle.
 I am
 planning on putting in a couple of emergency bags but I
 think we are
 overdoing that side.  As they
 say "Plan the dive and Dive the plan" should
 keep you out of most trouble with the emphasis
 on what if S--- happens.
 With the advent of
 Kevlar fishing gear and ropes the danger is increasing.
 I plan on keeping in touch with the tech divers
 who have the ability to
 rescue me at
 depth.  They can do 400 ft but would have to be brave to do
 600
 ft.  However if you need extra ballast
 then you can do worse than adding Air
 cylinders.  Chs Hugh

 -----Original Message-----
 From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org]
 On Behalf Of hank pronk via
 Personal_Submersibles
 Sent: Friday, 15
 August 2014 12:49 a.m.
 To: Personal
 Submersibles General Discussion
 Subject: Re:
 [PSUBS-MAILIST] emergency lift bags

 --------------------------------------------
 Hugh,
 If I was entangled in a
 net or line  that was attached to the bottom, I
 think I would be happy to have an extra 5,000
 lbs of lifting force.  I would
 prefer to
 have 5,800 lbs force trying to break free than 800lbs
 force.  In
 my line of work, when I
 can't lift it, pull it or push it, I add more power!
 It might be futile with an extra 5,000lbs but I
 would sure like to
 opportunity to try.
 Hank

  Subject:
 Re: [PSUBS-MAILIST] emergency lift bags
  To:
 "'Personal Submersibles General
 Discussion'"
 <personal_submersibles at psubs.org>
  Received: Wednesday, August 13, 2014, 5:49
 PM

  Ask him what to do
 when
  entangled with a net or line attached
 to the bottom!

  -----Original
  Message-----
  From: Personal_Submersibles

 [mailto:personal_submersibles-bounces at psubs.org]
  On Behalf Of hank pronk via

 Personal_Submersibles
  Sent: Thursday, 14
  August 2014 9:31 a.m.
  To: personal_submersibles at psubs.org
  Subject: [PSUBS-MAILIST] emergency lift
 bags

  When talking with a
 friend
  about escaping from a submarine, he
 asked why  can't your sub have a lift
 bag capable of  raising the sub even when full
 of  water.  I  could not give
 a good
 reason why not.  A large volume of  air would  be needed
 of coarse. 
 Some fast  math on a napkin
 revealed that 6 80cuft  scuba tanks could raise
 Gamma from 600 feet.  Two 240cu ft tanks
 strapped to  the bottom of  a sub
 and two
 lift bags, one at each end  could do it.  Why  bail out
 why not just
 raise the whole  thing unless
 your tangled and stuck of  coarse.
  Just a
 thought
  Hank

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