[PSUBS-MAILIST] gamma upgrades

Fri Sep 12 22:31:43 EDT 2014

The Spectra 12 was chosen for that very reason, to use as a sending line in case of emergency. And we needed low drag as most of the JSL operations areas in the early days were in the Bahamas and Gulf Stream off Florida.
Vance

-----Original Message-----
From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Fri, Sep 12, 2014 9:05 pm
Subject: Re: [PSUBS-MAILIST] gamma upgrades

I like the idea of a constant tension spool in the float, this way the float is 
always directly above the sub, or close at least.  A strong line will be needed 
because I want to be able to slide a rescue cable down the float line. Unless I 
have two lift bags installed by then. :-)
Hank

--------------------------------------------
On Fri, 9/12/14, Alan via Personal_Submersibles <personal_submersibles at psubs.org> 
wrote:

 Subject: Re: [PSUBS-MAILIST] gamma upgrades
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Friday, September 12, 2014, 8:38 PM

 Why go
 for a strong breaking strain if you are just towing a
 float?Wouldn't you want something that just
 suffices in case it snags
 onanything?Alan

 Sent from my iPad
 On
 13/09/2014, at 7:23 am, via Personal_Submersibles <personal_submersibles at psubs.org>
 wrote:

 Agreed. The
 best I've seen for this kind of thing is Spectra 12 from
 Novabraid--a hollow braided 12 strand rope with breaking
 strengths comparable to wire rope. The 1/8" diameter
 rope, for instance, has a breaking strength of 1800 pounds.
 Anyone who checked the JSL emergency buoy reel will have
 seen about a half mile of that stuff on a spool between the
 pilot's sphere and the diving compartment. It is
 seriously strong, easy to handle, and resistant to virtually
 everything, apparently (sun, salt water, heat, and so on).
 Great stuff.
 Vance

 -----Original
 Message-----

 From: Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org>

 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>

 Sent: Fri, Sep 12, 2014 8:10 pm

 Subject: Re: [PSUBS-MAILIST] gamma upgrades

 Be aware that when you start doing deeper
 dives, a significant portion of your power will be used just
 to drag that line through the water - particularly if
 holding position against a current. Don't go larger than
 necessary. You might want to consider a topsite float and
 constant tension on the line.

 Sean

 On September 12, 2014
 4:49:39 PM MDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 wrote:

 Vance,

 I like this rope because it is buoyant so it is always going
 straight up, also it never sinks into the prop on the
 surface.  It is not a tether really, it is a tow line for
 the flag since I don't have a surface boat.

 Hank

 On Fri, 9/12/14, Vance Bradley via Personal_Submersibles
 <personal_submersibles at psubs.org>
 wrote:

  Subject: Re: [PSUBS-MAILIST] gamma upgrades

  To: "Personal Submersibles General Discussion"
 <personal_submersibles at psubs.org>

  Received: Friday, September 12, 2014, 6:40 PM

  I don't like nylon

  for a surface tether because it soaks water over time
 and

  gets negative and heavy. Quarter inch polypropylene is

  neutral and has a 1400# breaking strength. We always used
 it

  unless there was a lift to do ( like long base acoustic

  transponders with a 300# bottom weight, for instance).

  Vance 

  Sent

  from my iPhone

  On Sep

  12, 2014, at 6:28 PM, hank pronk via
 Personal_Submersibles

  <personal_submersibles at psubs.org>

  wrote:

  Vance, 

  Great idea, I

  am using 1/2 in yellow nylon rope that is
 buoyant and so far

  it is good but,,, the other day I hit a tree and dragged

  it.  When I was surfacing I noticed the buoy line was
 going

  down while I was going up.  That is why I attached it
 to

  the sample bag winch.  Clever yes? lol.

  Hank

  On Fri, 9/12/14, Vance Bradley
 via

  Personal_Submersibles <personal_submersibles at psubs.org>

  wrote:

  Subject:

  Re: [PSUBS-MAILIST] gamma upgrades

  To:

  "Personal Submersibles General
 Discussion" <personal_submersibles at psubs.org>

  Received: Friday, September 12,
 2014, 6:23

  PM

  You can attach

  a trawl

  buoy to your surface line
 6-10

  feet above the sub to help

  keep the

  line away from your prop.

  Vance

  Sent from my iPhone

  On Sep 12, 2014, at 6:13 PM,
 hank

  pronk via

  Personal_Submersibles <personal_submersibles at psubs.org>

  wrote:

  Gamma has

  a

  modified scrubber that takes cartridges, I
 moved the fan

  inside the scrubber housing.  I
 mounted

  removable airtight

  caps on the intake

  and exhaust ports, now I can leave the

  cartridge inside the scrubber all the time. 
 I just

  remove

  the caps and turn on the

  scrubber.  I also added to my

  safety

  gear, I have a immersion suit in case I have
 to bail

  out in freezing water.  My
 diver below

  buoy and flag that I

  tow behind Gamma

  all the time is now detachable from

  inside.

 Hank

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