What setpoint for 100m+ diving do you use?

tecdivertraining · 12th February 2008, 09:49

Quote: (Originally Posted by decoweenie)

Personally, I would use 1.2-1.3 bottom SP for such a dive, and keep the same SP for deco.

We do similar profiles when diving the sub in UAE (~20mins at 115-120m) at 1.3 PO2 (bottom and deco) and IMHO it balances well between long deco and high CNS/OTU.

Same here...

***jradomski*** · 12th February 2008, 10:07

Quote: (Originally Posted by dave t)

Depending on which rebreather you use. at that depth setpoint overshoot may be a problem. I would run 1 - 1.2 and 1.2 to 6m then 1.3 - 1.4

my body dont like high o2

Dave

couldn't agree more.. When I use a stock inspiration I definately scale back the po2 on bottom.. I have seen some quite large overshoots!

I got so used to useing a lower SP because of this I usually still use a low SP on the HH even though it doesnt overshoot..

Mikel-Deko · 12th February 2008, 10:14

Quote: (Originally Posted by decoweenie)

Personally, I would use 1.2-1.3 bottom SP for such a dive, and keep the same SP for deco.

We do similar profiles when diving the sub in UAE (~20mins at 115-120m) at 1.3 PO2 (bottom and deco) and IMHO it balances well between long deco and high CNS/OTU.

Hi, same here.

But, with some good breaks to 0.5 ppO2

mattmexico · 12th February 2008, 15:03

yo

Some years ago I did a 1.3 for 20 min at 120 meters - 400 feet

Matt

Depth-junkie · 12th February 2008, 15:59

1.3 for all decent from 40m down to 100m+ (ADV firing keeps loop at a nice safe po2 for decent, also good switching at 40m as it allows me to spike setpiont by just holding my breath for a few meters, so when i hit bottom i am ready and away with no messing about), all the bottom phase of the dive and ascent upto 6m i continue 1.3.

For the last 30-40mins @ 6m i rank it upto 1.4. I only do it for hte last part of deco as i find on big dives the 1st half hour or so at 6m i am off gassing that much into the CCR lungs/loop, with the soliniod firing to maintain SP the lungs soon fill and need emptying to maintain min volume. When the SP is being maintained steadily (not rapid fluctuations) and the lungs are holdng a nice steady volume this is when i switch up to 1.4.

ATB
Gareth

Captain Nemo · 12th February 2008, 20:34

Low Setpoint 0.70 ppo2 till Autoswitch 3 metres above target, 1.3 ppo2 on bottom. Then change to 1.4 ppo2 for ascent.

Gobfish1 · 12th February 2008, 21:49

Quote: (Originally Posted by Depth-junkie)

1.3 for all decent from 40m down to 100m+ (ADV firing keeps loop at a nice safe po2 for decent, also good switching at 40m as it allows me to spike setpiont by just holding my breath for a few meters, so when i hit bottom i am ready and away with no messing about), all the bottom phase of the dive and ascent upto 6m i continue 1.3.

For the last 30-40mins @ 6m i rank it upto 1.4. I only do it for hte last part of deco as i find on big dives the 1st half hour or so at 6m i am off gassing that much into the CCR lungs/loop, with the soliniod firing to maintain SP the lungs soon fill and need emptying to maintain min volume. When the SP is being maintained steadily (not rapid fluctuations) and the lungs are holdng a nice steady volume this is when i switch up to 1.4.

ATB
Gareth

ditto,, but with a bit more o2 at 6m and a flush now and then

ps only done 90m

rogeringebo · 12th February 2008, 23:27

Thanks for all the input!
Interesting views....
I would personally go with something in the region of 1.0- 1.1 on the bottom.
What about dive planning?

What software?
Algorithm?
-V-planner
-Dekochek
-Proplanner
-Safety factors (padding)
-Gradient Factors

etc

What do you prefer and why?

Cheers
Roger

Gobfish1 · 13th February 2008, 00:06

Vr3 for the dive,
cos it ant never let me down yet

it ant bent me to much

Zplan,
for working out gas need's for bailout cos its simple to use and play the numbers,

DDplan
back up and bailout tables , cos i like the print outs

Safety factors (padding)

Vr3 zero safety, may pad out last stop's if i think its been a hard dive ,,
up to one half the bottom max ,

zplan zero safety

ddplan set GF s to what ever come's in close to zplan numbers

ps
i have only dived to 90m and i may think about a 1.2 set point on bottom for dives past 100m,
when i do some

Drmike · 13th February 2008, 02:25

Quote: (Originally Posted by Gilles)

I don't get to these depths yet, but... if I were confident with my sensors and their calibration I'd explore using 1.3 on bottom, and try to minimize the oxygen burn toward the surface.

I know already my lungs don't like excessive exposure to O2. Gotta keep them OTU's down.
..

if you dont know what your talking about - why talk?

12th February 2008, 09:49	#11 (permalink)
tecdivertraining RebreatherWorld Sponsor Current Rebreather/s: Inspiration Classic Inspiration Vision Evolution Megalodon Dolphin Other Rebreather/s: Not Bought Yet Dolphin Join Date: May 2005 Location: Phuket, Thailand Posts: 389	Re: What setpoint for 100m+ diving do you use? Quote: (Originally Posted by decoweenie) Personally, I would use 1.2-1.3 bottom SP for such a dive, and keep the same SP for deco. We do similar profiles when diving the sub in UAE (~20mins at 115-120m) at 1.3 PO2 (bottom and deco) and IMHO it balances well between long deco and high CNS/OTU. Same here... __________________ Mathew Partridge Technical Director Pro-Tech Dive College www.protechdivers.com www.tech-ccr.com
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12th February 2008, 10:07	#12 (permalink)
*jradomski* Moderator Current Rebreather/s: Inspiration Classic Sport Kiss Optima rEvo Other CCR Home Build Other Rebreather/s: Inspiration Vision Evolution Megalodon Classic Kiss rEvo Other CCR Home Build Join Date: Mar 2005 Location: "Da" Bronx Posts: 2,799	Re: What setpoint for 100m+ diving do you use? Quote: (Originally Posted by dave t) Depending on which rebreather you use. at that depth setpoint overshoot may be a problem. I would run 1 - 1.2 and 1.2 to 6m then 1.3 - 1.4 my body dont like high o2 Dave couldn't agree more.. When I use a stock inspiration I definately scale back the po2 on bottom.. I have seen some quite large overshoots! I got so used to useing a lower SP because of this I usually still use a low SP on the HH even though it doesnt overshoot.. __________________ Joe Radomski CCR Trimix Instructor Trainer ANDI Instructor Trainer Director #10 All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated.
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12th February 2008, 10:14	#13 (permalink)
Mikel-Deko Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other CCR Other Rebreather/s: Other CCR Join Date: Jul 2005 Location: Basque Country -Sp- Posts: 408	Re: What setpoint for 100m+ diving do you use? Quote: (Originally Posted by decoweenie) Personally, I would use 1.2-1.3 bottom SP for such a dive, and keep the same SP for deco. We do similar profiles when diving the sub in UAE (~20mins at 115-120m) at 1.3 PO2 (bottom and deco) and IMHO it balances well between long deco and high CNS/OTU. Hi, same here. But, with some good breaks to 0.5 ppO2 __________________ Mikel-Deko Basque Country www.olatu.net "DIR is the nanny state for divers who cannot think on their own" Ron Micjan
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12th February 2008, 15:03	#14 (permalink)
mattmexico Rebreather World Writer Current Rebreather/s: Megalodon Classic Kiss Optima RB80 / Clone Other Rebreather/s: Inspiration Classic Evolution Prism Topaz Sport Kiss RB80 / Clone Join Date: Aug 2005 Location: Mexico, Q.Roo, Playa del Carmen Posts: 696	Re: What setpoint for 100m+ diving do you use? yo Some years ago I did a 1.3 for 20 min at 120 meters - 400 feet Matt __________________ N 20' 37.617' W 87' 04.693' www.andreaswmatthes.com
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12th February 2008, 15:59	#15 (permalink)
Depth-junkie 10/52 Psycho Current Rebreather/s: Inspiration Vision Other Rebreather/s: Join Date: Aug 2005 Location: Wrexham Posts: 288	Re: What setpoint for 100m+ diving do you use? 1.3 for all decent from 40m down to 100m+ (ADV firing keeps loop at a nice safe po2 for decent, also good switching at 40m as it allows me to spike setpiont by just holding my breath for a few meters, so when i hit bottom i am ready and away with no messing about), all the bottom phase of the dive and ascent upto 6m i continue 1.3. For the last 30-40mins @ 6m i rank it upto 1.4. I only do it for hte last part of deco as i find on big dives the 1st half hour or so at 6m i am off gassing that much into the CCR lungs/loop, with the soliniod firing to maintain SP the lungs soon fill and need emptying to maintain min volume. When the SP is being maintained steadily (not rapid fluctuations) and the lungs are holdng a nice steady volume this is when i switch up to 1.4. ATB Gareth __________________ Alpine low rider of the P.D.D.T
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12th February 2008, 20:34	#16 (permalink)
Captain Nemo New Member Current Rebreather/s: Evolution Other Rebreather/s: Not Bought Yet Inspiration Classic Inspiration Vision Evolution Megalodon Sport Kiss Classic Kiss Join Date: Oct 2006 Location: End of the known world Posts: 44	Re: What setpoint for 100m+ diving do you use? Low Setpoint 0.70 ppo2 till Autoswitch 3 metres above target, 1.3 ppo2 on bottom. Then change to 1.4 ppo2 for ascent. __________________ Look beyond the dark side into the light. Beware of false knowledge; It is more dangerous than ignorance.
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12th February 2008, 21:49	#17 (permalink)
Gobfish1 Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other Rebreather/s: Inspiration Classic Inspiration Vision Evolution Join Date: Apr 2005 Location: Manchester UK Posts: 352	Re: What setpoint for 100m+ diving do you use? Quote: (Originally Posted by Depth-junkie) 1.3 for all decent from 40m down to 100m+ (ADV firing keeps loop at a nice safe po2 for decent, also good switching at 40m as it allows me to spike setpiont by just holding my breath for a few meters, so when i hit bottom i am ready and away with no messing about), all the bottom phase of the dive and ascent upto 6m i continue 1.3. For the last 30-40mins @ 6m i rank it upto 1.4. I only do it for hte last part of deco as i find on big dives the 1st half hour or so at 6m i am off gassing that much into the CCR lungs/loop, with the soliniod firing to maintain SP the lungs soon fill and need emptying to maintain min volume. When the SP is being maintained steadily (not rapid fluctuations) and the lungs are holdng a nice steady volume this is when i switch up to 1.4. ATB Gareth ditto,, but with a bit more o2 at 6m and a flush now and then ps only done 90m __________________ Steve G Apparently not the only gay diver in the village http://drinkingliberally.org/blogs/o...nzee-glock.gif http://www.scubatunes.com/audio/vol01/mp3/HiTech.mp3
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12th February 2008, 23:27	#18 (permalink)
rogeringebo Done with bubbles Current Rebreather/s: Pelagian Other Rebreather/s: Megalodon Classic Kiss Pelagian Join Date: Sep 2005 Location: Stockholm Sweden Posts: 671	Re: What setpoint for 100m+ diving do you use? Thanks for all the input! Interesting views.... I would personally go with something in the region of 1.0- 1.1 on the bottom. What about dive planning? What software? Algorithm? -V-planner -Dekochek -Proplanner -Safety factors (padding) -Gradient Factors etc What do you prefer and why? Cheers Roger
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13th February 2008, 00:06	#19 (permalink)
Gobfish1 Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other Rebreather/s: Inspiration Classic Inspiration Vision Evolution Join Date: Apr 2005 Location: Manchester UK Posts: 352	Re: What setpoint for 100m+ diving do you use? Vr3 for the dive, cos it ant never let me down yet it ant bent me to much Zplan, for working out gas need's for bailout cos its simple to use and play the numbers, DDplan back up and bailout tables , cos i like the print outs Safety factors (padding) Vr3 zero safety, may pad out last stop's if i think its been a hard dive ,, up to one half the bottom max , zplan zero safety ddplan set GF s to what ever come's in close to zplan numbers ps i have only dived to 90m and i may think about a 1.2 set point on bottom for dives past 100m, when i do some __________________ Steve G Apparently not the only gay diver in the village http://drinkingliberally.org/blogs/o...nzee-glock.gif http://www.scubatunes.com/audio/vol01/mp3/HiTech.mp3 Last edited by Gobfish1 : 13th February 2008 at 06:26.
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13th February 2008, 02:25	#20 (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: 3,113	Re: What setpoint for 100m+ diving do you use? Quote: (Originally Posted by Gilles) I don't get to these depths yet, but... if I were confident with my sensors and their calibration I'd explore using 1.3 on bottom, and try to minimize the oxygen burn toward the surface. I know already my lungs don't like excessive exposure to O2. Gotta keep them OTU's down. .. if you dont know what your talking about - why talk? __________________ Get a girlfriend you sad twat - a Rebreather is an unfaithful mistress - dont blind yourself to her faults just because she goes down on you
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