[PSUBS-MAILIST] gamma upgrades

Alan via Personal_Submersibles personal_submersibles at psubs.org
Fri Sep 12 21:51:36 EDT 2014 

I was wondering about a constant tension spool.
How do you do that with a large variation of line length?
It would be easy spooling out, but you would need some sort 
of motor & level wind to wind in over the depth that you are intending.
Alan



Sent from my iPad

> On 13/09/2014, at 7:58 am, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 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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