Strobs and shot lines

***EBT*** · 10th May 2006, 18:29

Quote: (Originally Posted by Decodiver)

I also use another little toy to attach myself to the shot whilst decompressing, it is an improvement on a Jon-Line and can be set so that you cannot sink back down further than the length of the Jon-Line in the event of a problem, you can only rise to the surface.

I particularly use this when I dive solo and am going to be the last one out of the water.

coops, whats wrong with a jon thats attached via a prussik? thats what I use. Costs me about £7 to build, including a clip you can release under tension.

/Z

***Decodiver*** · 10th May 2006, 18:43

Quote: (Originally Posted by EBT)

coops, whats wrong with a jon thats attached via a prussik? thats what I use. Costs me about £7 to build, including a clip you can release under tension.

/Z

Nothing wrong at all Zak my old chum, I just can't be asked and you're a cheapskate!

Ha ha.

Dave.

decoweenie · 10th May 2006, 19:22

Quote: (Originally Posted by EBT)

whats wrong with a jon thats attached via a prussik?

From experience, Prussil doesn't work very well when not under tension.

As far as breaking Jotrons, you guys are much harder on your equipment than me. I only have been using my Jotron for 8 years...

Crazyduck · 10th May 2006, 19:34

Interesting anecdote!

In the Flower Garden the divemaster put out the strobes for the night dives and retrieve them. One evening after putting out the strobes a radio call came in advising of a large tiger shark had been sighted in the area.

The divemaster went back in and pulled the strobes!

That takes balls in my book!

Andrew

***EBT*** · 10th May 2006, 20:25

Quote: (Originally Posted by decoweenie)

From experience, Prussil doesn't work very well when not under tension.

Provided you select your cord type/diameter appropriately, you'll be fine. Remember, we're not climbing here, its merely a locking mechanism. Also, re; tension... if theres no tension, theres no need for a jon line. Simple really

viscya · 10th May 2006, 20:30

Anyone know the size of the o-ring in the Jotrons? On first use mine flooded. Turns out the o-ring has a significant cut in it. It still works, but I want to get a new o-ring before trying again.

Mark Chase · 10th May 2006, 22:47

Quote: (Originally Posted by EBT)

Provided you select your cord type/diameter appropriately, you'll be fine. Remember, we're not climbing here, its merely a locking mechanism. Also, re; tension... if theres no tension, theres no need for a jon line. Simple really

Can you show a pick or give a link explaining a Prussell please.

ATB

Mark Chase

***EBT*** · 10th May 2006, 23:08

Try this here;

http://www.cybernex.net.au/clubs/pat...s_Prussik.html

or http://ozultimate.com/canyoning/knots/prusik/

The trick here is that the prussik cord needs to be < 1/2 the diameter of the main cord. Using a cord with a 3 strand laid construction is also better than something braided.

Mine is tied as a double loop bowline in the end of a cord with a yachting clip on the other end.

The downside to doing this, is if people run overlapping schedules, since the prussik then has to be removed and replaced.

As phi says, without any tension, the prussik is easy to slide up/down. This makes it ideal for this application IMHO.

/Zak

Mark Chase · 10th May 2006, 23:11

Thanks Zak that makes sense now.

ATB

Mark Chase

pchanning · 10th May 2006, 23:15

Quote: (Originally Posted by viscya)

Anyone know the size of the o-ring in the Jotrons? On first use mine flooded. Turns out the o-ring has a significant cut in it. It still works, but I want to get a new o-ring before trying again.

The tolerances aren't great on the ones I have, so I presume they are all the same. It helps to use plumbers tape on the threads, packs it out. No idea about the o-ring though. HTH

10th May 2006, 18:29	#21 (permalink)
*EBT* Apprentice Luddite Current Rebreather/s: Classic Kiss Other Rebreather/s: Inspiration Classic Join Date: Feb 2005 Location: UK, Brighton Posts: 1,970	Re: Strobs and shot lines Quote: (Originally Posted by Decodiver) I also use another little toy to attach myself to the shot whilst decompressing, it is an improvement on a Jon-Line and can be set so that you cannot sink back down further than the length of the Jon-Line in the event of a problem, you can only rise to the surface. I particularly use this when I dive solo and am going to be the last one out of the water. coops, whats wrong with a jon thats attached via a prussik? thats what I use. Costs me about £7 to build, including a clip you can release under tension. /Z __________________ Eagles May Soar, but weasels don't get sucked into jet engines! Rebreather World Terms of service Real diving t-shirts for real divers
(Offline)

10th May 2006, 18:43	#22 (permalink)
*Decodiver* Administrator Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Jan 2005 Location: Geneva Posts: 2,181	Re: Strobs and shot lines Quote: (Originally Posted by EBT) coops, whats wrong with a jon thats attached via a prussik? thats what I use. Costs me about £7 to build, including a clip you can release under tension. /Z Nothing wrong at all Zak my old chum, I just can't be asked and you're a cheapskate! Ha ha. Dave. __________________ CCR/OC Trimix Instructor Trainer CCR Training to Mixed Gas in Switzerland, France, UK & Germany on Megalodon/COPIS-Megalodon/KISS/Sport KISS/Ouroboros/rEvo/Inspiration/Evolution/Sentinel www.zerogravitydiving.com Rebreather World Terms & Conditions
(Offline)

10th May 2006, 19:22	#23 (permalink)
decoweenie Crash Test Dummy Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Cairo Posts: 5,487	Re: Strobs and shot lines Quote: (Originally Posted by EBT) whats wrong with a jon thats attached via a prussik? From experience, Prussil doesn't work very well when not under tension. As far as breaking Jotrons, you guys are much harder on your equipment than me. I only have been using my Jotron for 8 years...
(Offline)

10th May 2006, 19:34	#24 (permalink)
Crazyduck Underwater Mechanic Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Mar 2005 Location: TEXAS, Dallas/ Ft.Worth Posts: 711	Teethy Strobes Interesting anecdote! In the Flower Garden the divemaster put out the strobes for the night dives and retrieve them. One evening after putting out the strobes a radio call came in advising of a large tiger shark had been sighted in the area. The divemaster went back in and pulled the strobes! That takes balls in my book! Andrew __________________ Howdy Senor- What’s Happening! Rob Davie April 2005- Presently in a state of transition from Open Circuit to Closed Circuit. "You will not be punished for your anger; you will be punished by it." - Buddha.
(Offline)

10th May 2006, 20:25	#25 (permalink)
*EBT* Apprentice Luddite Current Rebreather/s: Classic Kiss Other Rebreather/s: Inspiration Classic Join Date: Feb 2005 Location: UK, Brighton Posts: 1,970	Re: Strobs and shot lines Quote: (Originally Posted by decoweenie) From experience, Prussil doesn't work very well when not under tension. Provided you select your cord type/diameter appropriately, you'll be fine. Remember, we're not climbing here, its merely a locking mechanism. Also, re; tension... if theres no tension, theres no need for a jon line. Simple really __________________ Eagles May Soar, but weasels don't get sucked into jet engines! Rebreather World Terms of service Real diving t-shirts for real divers
(Offline)

10th May 2006, 20:30	#26 (permalink)
viscya Wrecking Crew Current Rebreather/s: Classic Kiss Other Rebreather/s: Join Date: Oct 2005 Location: Marlton New Jersey Posts: 138	Re: Strobs and shot lines Anyone know the size of the o-ring in the Jotrons? On first use mine flooded. Turns out the o-ring has a significant cut in it. It still works, but I want to get a new o-ring before trying again.
(Offline)

10th May 2006, 22:47	#27 (permalink)
Mark Chase I go down for ages Current Rebreather/s: Classic Kiss Other Rebreather/s: Inspiration Classic Join Date: Jan 2005 Location: Kent Posts: 2,700	Re: Strobs and shot lines Quote: (Originally Posted by EBT) Provided you select your cord type/diameter appropriately, you'll be fine. Remember, we're not climbing here, its merely a locking mechanism. Also, re; tension... if theres no tension, theres no need for a jon line. Simple really Can you show a pick or give a link explaining a Prussell please. ATB Mark Chase __________________ Is it supposed to make that noise ? I took my unit to the dive shop and demanded they bolt on every thing that would fit. Join my elite diving teem and get a Tshirt "Doing It Chasey"Hammerhead Eccr Advanced Diving System
(Offline)

10th May 2006, 23:08	#28 (permalink)
*EBT* Apprentice Luddite Current Rebreather/s: Classic Kiss Other Rebreather/s: Inspiration Classic Join Date: Feb 2005 Location: UK, Brighton Posts: 1,970	Re: Strobs and shot lines Try this here; http://www.cybernex.net.au/clubs/pat...s_Prussik.html or http://ozultimate.com/canyoning/knots/prusik/ The trick here is that the prussik cord needs to be < 1/2 the diameter of the main cord. Using a cord with a 3 strand laid construction is also better than something braided. Mine is tied as a double loop bowline in the end of a cord with a yachting clip on the other end. The downside to doing this, is if people run overlapping schedules, since the prussik then has to be removed and replaced. As phi says, without any tension, the prussik is easy to slide up/down. This makes it ideal for this application IMHO. /Zak __________________ Eagles May Soar, but weasels don't get sucked into jet engines! Rebreather World Terms of service Real diving t-shirts for real divers Last edited by EBT : 10th May 2006 at 23:11.
(Offline)

10th May 2006, 23:11	#29 (permalink)
Mark Chase I go down for ages Current Rebreather/s: Classic Kiss Other Rebreather/s: Inspiration Classic Join Date: Jan 2005 Location: Kent Posts: 2,700	Re: Strobs and shot lines Thanks Zak that makes sense now. ATB Mark Chase __________________ Is it supposed to make that noise ? I took my unit to the dive shop and demanded they bolt on every thing that would fit. Join my elite diving teem and get a Tshirt "Doing It Chasey"Hammerhead Eccr Advanced Diving System
(Offline)

10th May 2006, 23:15	#30 (permalink)
pchanning PFO free :) Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Feb 2005 Location: fixed! Posts: 454	Re: Strobs and shot lines Quote: (Originally Posted by viscya) Anyone know the size of the o-ring in the Jotrons? On first use mine flooded. Turns out the o-ring has a significant cut in it. It still works, but I want to get a new o-ring before trying again. The tolerances aren't great on the ones I have, so I presume they are all the same. It helps to use plumbers tape on the threads, packs it out. No idea about the o-ring though. HTH __________________ Cheers Paul The key to enlightenment... is survival.
(Offline)

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode