Jon lines from Not a good dive

Drmike · 11th November 2007, 09:24

Split from Not a good DIve: http://www.rebreatherworld.com/rebre...tml#post150296

Quote: (Originally Posted by RichClark)

Thanks for the report Mark. Sounds like a crap day out!

I always carry a Jon line now after a similar dive in similar currents last year. I decided that I always need the use of at least one hand to be able to take appropriate actions.

Cheers

Rich

same here. If the currents are bad ill set up my jon line deeper where its easy to do then move it up with me as i ascend. I found a double ended jon line (clips on both chest d rings) is far more comfortable. my reasoning also on long hangs is if i do tox im not going to fall off the line and sink (not much point having a ffm if you tox then sink)

**kybrt** · 11th November 2007, 22:49

hey dr mike,

here in the ne us we use 'jon lines' all the time.

we tie a loop in each end, we pass the end through one of the loops so the jon line locks into the up line, then we put the clip on the other loop and then to a d ring.

this way if you have an issue you dont sink too far past where you had a problem and hopefully someone else doing deco sees you.

it kind of resembles a prusik knot if you can visualize it.

take care

Mdemon · 12th November 2007, 18:34

I use something similar. I have a metre or so of thick bungee. This has piston clip/dog snaps at each end.

I "prusik" the middle of this around the shot and hold it or clip it on.

The bungee absorbs any wave action and makes for a more comfortable deco.

HTH

***Beanie*** · 12th November 2007, 19:29

Quote: (Originally Posted by Mdemon)

I use something similar. I have a metre or so of thick bungee. This has piston clip/dog snaps at each end.

I "prusik" the middle of this around the shot and hold it or clip it on.

The bungee absorbs any wave action and makes for a more comfortable deco.

HTH

I have similar two bungee loops a short one with a SS ring which goes to my 'scooter' ring on my crotch strap about a foot long. then another loop with a bolt snap about 3 foot long works a treat.

maybe we sould have another thread on this?

Soren Thomsen · 12th November 2007, 19:46

Quote: (Originally Posted by kybrt)

it kind of resembles a prusik knot if you can visualize it.

take care

Any pics of the various jon lines....thanks

Cheers

Soren

JS1scuba · 12th November 2007, 20:13

Trivia question....... why is a Jon line called a Jon line ?

First person to get the CORRECT complete answer gets a $10.00 coupon from TDL.

Cheers

***Beanie*** · 12th November 2007, 20:14

Quote: (Originally Posted by JS1scuba)

Trivia question....... why is a Jon line called a Jon line ?

First person to get the CORRECT complete answer gets a $10.00 coupon from TDL.

Cheers

named after the guy who first come up with the idea but buggered if I can remember who it was

David Pye · 12th November 2007, 20:15

The term Jon Line was first used after a diver named Jon Hulburt, who, while doing a dive on the Andrea Doria discovered that decompression hangs in rough water or in a current were made much easier with the use of a short line. This Jon Line is about seven to 15 feet long with a spliced loop at each end.

Thank god for google

JS1scuba · 12th November 2007, 20:16

Quote: (Originally Posted by Beanie)

named after the guy who first come up with the idea but buggered if I can remember who it was

close but no cigar .... you need to come up with the complete story / and full name .....

CCR-Wrecker · 12th November 2007, 20:16

Quote: (Originally Posted by JS1scuba)

Trivia question....... why is a Jon line called a Jon line ?

First person to get the CORRECT complete answer gets a $10.00 coupon from TDL.

Cheers

Jon Hulbert, the inventor
WOW I type SLOW, it's already been shot down!

11th November 2007, 09:24	#1 (permalink)
Drmike Custom Title Allowed! Current Rebreather/s: MK 15.X Ouroboros Other CCR Home Build Other Rebreather/s: Inspiration Classic Other CCR Home Build Join Date: Feb 2005 Posts: 3,157	Re: Not a good dive Split from Not a good DIve: http://www.rebreatherworld.com/rebre...tml#post150296 Quote: (Originally Posted by RichClark) Thanks for the report Mark. Sounds like a crap day out! I always carry a Jon line now after a similar dive in similar currents last year. I decided that I always need the use of at least one hand to be able to take appropriate actions. Cheers Rich same here. If the currents are bad ill set up my jon line deeper where its easy to do then move it up with me as i ascend. I found a double ended jon line (clips on both chest d rings) is far more comfortable. my reasoning also on long hangs is if i do tox im not going to fall off the line and sink (not much point having a ffm if you tox then sink) __________________ Cave diving is a sport Wreck diving is a sport Diving in general is a sport 'Rebreather diving' is not a sport its the delusional obsession with a highly dangerous and often inappropriate piece of equipment Last edited by Beanie : 12th November 2007 at 20:10. Reason: splith thread link back
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11th November 2007, 22:49	#2 (permalink)
kybrt too legit to quit Current Rebreather/s: rEvo Other Rebreather/s: rEvo Join Date: Jan 2007 Location: Neuw Yawk Posts: 324	Re: Not a good dive hey dr mike, here in the ne us we use 'jon lines' all the time. we tie a loop in each end, we pass the end through one of the loops so the jon line locks into the up line, then we put the clip on the other loop and then to a d ring. this way if you have an issue you dont sink too far past where you had a problem and hopefully someone else doing deco sees you. it kind of resembles a prusik knot if you can visualize it. take care __________________ Marv Fidelis Ad Mortem www.diveboatkaren.com
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12th November 2007, 18:34	#3 (permalink)
Mdemon SiegeEngine II Current Rebreather/s: Inspiration Classic Home Build Other Rebreather/s: Inspiration Classic Home Build Join Date: Feb 2007 Location: SWUK Posts: 1,904	Re: Not a good dive I use something similar. I have a metre or so of thick bungee. This has piston clip/dog snaps at each end. I "prusik" the middle of this around the shot and hold it or clip it on. The bungee absorbs any wave action and makes for a more comfortable deco. HTH __________________ www.southwestmafia.com "Once the agenda-monkeys and perfect-worlders have moved on, perhaps we can do some diving?"
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12th November 2007, 19:29	#4 (permalink)
*Beanie* Close to that red button Current Rebreather/s: Inspiration Classic Other Rebreather/s: Inspiration Vision Join Date: Jan 2005 Location: In da house! yeah baby! Posts: 3,207	Re: Not a good dive Quote: (Originally Posted by Mdemon) I use something similar. I have a metre or so of thick bungee. This has piston clip/dog snaps at each end. I "prusik" the middle of this around the shot and hold it or clip it on. The bungee absorbs any wave action and makes for a more comfortable deco. HTH I have similar two bungee loops a short one with a SS ring which goes to my 'scooter' ring on my crotch strap about a foot long. then another loop with a bolt snap about 3 foot long works a treat. maybe we sould have another thread on this? __________________ Beanie Gallery Admin & Library Assistant. www.outlawdivers.org.uk www.beandiving.co.uk www.beanengineering.co.uk www.divelife.co.uk
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12th November 2007, 19:46	#5 (permalink)
Soren Thomsen Happy Hippo Current Rebreather/s: Not Bought Yet Other Rebreather/s: Inspiration Classic Not Bought Yet Join Date: Jan 2006 Location: Denmark Posts: 148	Re: Not a good dive Quote: (Originally Posted by kybrt) it kind of resembles a prusik knot if you can visualize it. take care Any pics of the various jon lines....thanks Cheers Soren __________________ - Giraffes were created when Chuck Norris uppercutted a horse -
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12th November 2007, 20:13	#6 (permalink)
JS1scuba RebreatherWorld Sponsor Current Rebreather/s: Classic Kiss Other Rebreather/s: Classic Kiss MK 15.X Join Date: Oct 2005 Location: Lake Havasu City, AZ - USA Posts: 424	Re: Jon lines from Not a good dive Trivia question....... why is a Jon line called a Jon line ? First person to get the CORRECT complete answer gets a $10.00 coupon from TDL. Cheers __________________ Joel Silverstein, VP COO Tech Diving Limited a Division of Scuba Training and Technology Inc. http://www.nautilusdiveplanner.com FREE NAUTILUS DIVE PLANNER DEMO - REGISTER HERE KISS # 275
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12th November 2007, 20:14	#7 (permalink)
*Beanie* Close to that red button Current Rebreather/s: Inspiration Classic Other Rebreather/s: Inspiration Vision Join Date: Jan 2005 Location: In da house! yeah baby! Posts: 3,207	Re: Jon lines from Not a good dive Quote: (Originally Posted by JS1scuba) Trivia question....... why is a Jon line called a Jon line ? First person to get the CORRECT complete answer gets a $10.00 coupon from TDL. Cheers named after the guy who first come up with the idea but buggered if I can remember who it was __________________ Beanie Gallery Admin & Library Assistant. www.outlawdivers.org.uk www.beandiving.co.uk www.beanengineering.co.uk www.divelife.co.uk
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12th November 2007, 20:15	#8 (permalink)
David Pye CK 69+Shearwater Pursuit Current Rebreather/s: Classic Kiss Other Rebreather/s: Join Date: May 2006 Location: Newcastle Upon Tyne Posts: 166	Re: Jon lines from Not a good dive The term Jon Line was first used after a diver named Jon Hulburt, who, while doing a dive on the Andrea Doria discovered that decompression hangs in rough water or in a current were made much easier with the use of a short line. This Jon Line is about seven to 15 feet long with a spliced loop at each end. Thank god for google
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12th November 2007, 20:16	#9 (permalink)
JS1scuba RebreatherWorld Sponsor Current Rebreather/s: Classic Kiss Other Rebreather/s: Classic Kiss MK 15.X Join Date: Oct 2005 Location: Lake Havasu City, AZ - USA Posts: 424	Re: Jon lines from Not a good dive Quote: (Originally Posted by Beanie) named after the guy who first come up with the idea but buggered if I can remember who it was close but no cigar .... you need to come up with the complete story / and full name .....
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12th November 2007, 20:16	#10 (permalink)
CCR-Wrecker Classic KISSer #276 Current Rebreather/s: Inspiration Classic Classic Kiss Other Rebreather/s: Inspiration Classic Join Date: Apr 2005 Location: New York Posts: 222	Re: Jon lines from Not a good dive Quote: (Originally Posted by JS1scuba) Trivia question....... why is a Jon line called a Jon line ? First person to get the CORRECT complete answer gets a $10.00 coupon from TDL. Cheers Jon Hulbert, the inventor WOW I type SLOW, it's already been shot down! __________________ "I know what you'll find, it's in your mind, it's what you want to see..." Ozzy Last edited by CCR-Wrecker : 12th November 2007 at 20:17. Reason: slow
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