[PSUBS-MAILIST] gamma upgrades

Fri Sep 12 22:29:52 EDT 2014

You want it releasable from the sub in that case, but strong enough to use as a down line or sending line or whatever in case of entanglement.
Vance

-----Original Message-----
From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Fri, Sep 12, 2014 8:39 pm
Subject: Re: [PSUBS-MAILIST] gamma upgrades

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 on
anything?
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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