What setpoint for 100m+ diving do you use?

Drmike · 13th February 2008, 23:45

Quote: (Originally Posted by Gobfish1)

The standard A6 table used for a chamber ride need 650 OTU ,, i read ,,, some place ,,

i never worry about OTU ,,

We have a hypobaric Doc and chamber operators as part of our Thai support team for our big dives. As part of our procedures and in light of the long exposures we discussed the issue of OTUs and how that may influence or restrict any subsequent treatment. The concensus was that treatment is given as much as the individual can take regardless of previous OTUs due to the large variability between individuals.

Gobfish1 · 14th February 2008, 00:06

Quote: (Originally Posted by Drmike)

We have a hypobaric Doc and chamber operators as part of our Thai support team for our big dives. As part of our procedures and in light of the long exposures we discussed the issue of OTUs and how that may influence or restrict any subsequent treatment. The concensus was that treatment is given as much as the individual can take regardless of previous OTUs due to the large variability between individuals.

to right ,, give to me , i want it , i need it , **** it let me have it , type of thing ,, shit or bust . we call it in manchester ,,

the 650 OTU was posted , just for the great unwashed to dwell on,

if it takes two doc's to work out, when ist shit or bust time .. just as well we let the great unwashed see why the OTU numbers are so ,,

still no photo of you with out you're underwear ,, i have been looking forward and hoping all day ,,

ps

increased WOB think im holding some co2 thinking of you ,,

Jim · 14th February 2008, 13:42

'''''still no photo of you with out you're underwear ,, i have been looking forward and hoping all day ,,

ps

increased WOB think im holding some co2 thinking of you ,,[/quote]''''

A bit off topic ..... and you certainly couldn't pay me enough pink pounds to check out any of you lot naked !!

Gobfish1 · 14th February 2008, 19:00

***EBT*** · 19th February 2008, 14:46

Just remembered a link to a parallel discussion on DIRexplorers, where theres some interesting rubicon links/info posted by Gene.

DIRexplorers discussion

maayanh · 5th March 2008, 06:01

two questions,
1. how high do you let your cns clock on these kind of dives (110m, 25min bottom)? 100%, 150% 200% unlimited?

2. do you say on the mix the whole dive, I was taught to flush the loop with air@25m (surviving the ppN2 spike

)

Drmike · 5th March 2008, 08:06

Quote: (Originally Posted by maayanh)

two questions,
1. how high do you let your cns clock on these kind of dives (110m, 25min bottom)? 100%, 150% 200% unlimited?

is there a choice? For me CNS depends on the dive - not the other way around.

Quote:

2. do you say on the mix the whole dive, I was taught to flush the loop with air@25m (surviving the ppN2 spike

)

the later. BTW who is still teaching air flushes?

Mark Chase · 5th March 2008, 08:36

Strangely on OC dives I always used to plan for 1.4 on the bottom. So my first 100m dive OC was 1.4pp02 on the bottom and 1.6 at 66m (21/35) 1.6 @ 33m (36%) and 1.6 at 10m on 80%

For some strange reason I was always perfectly happy using the 1.4pp02 on the bottom of all my dives and often went above slightly due to fill errors. Id be happy pushing CNS to 150% but after that id start doing 15on/5off air breaks.

Then I read some GUE stuff several years ago which suggested I shouldn't be running such high pp02s on the bottom and I should only use 1.6 from 21m and up. The research appeared to make a strong link between working and high PPo2 but I didn't quite follow why I couldn't use 1.6 on deep deco (deep for me being 66m)

I decided to stick with my deep 1.6 as the stop times were so short it hardly seemed to matter.

Then in 04 when I switched to CCR things got a lot more complicated due to the constant PP02. Now I was running 1.3 for everything. I did three dives between 96m and 105m running 1.3pp02 all the way. On one dive lasting just under three and a half hours I noticed signs of lung irritation. This was on a multi day trip with several dives below 60 that week.

After this event I started introducing air breaks past 120 cns

I haven't suffered any lung irritation since. Whilst I very rarely go past 90m I do do a lot of diving over 100% CNS due to long bottom times in the 60-80m range.

A dive past 100m is a major event for me so Ill err on the side of caution. Because CCR has the odd spike and trough in PP02 I have gone with the generally accepted idea of running 1.2pp02 on the deeper dives.

I believe in a max END of 25m so I tend to run a lot of He in the mix. I understand more He will reduce breathing resistance and decrease C02 retention. This to me is a good thing.

I would never do any intentional hard work below 90m. If i found the telegraph it can just stay there. I am much more concerned about my level of work / stress at great depth than I am about my PP02 or He percentage.

Since switching to CCR i have always ran 1.3 for deco till the last stop depth. Then I will run 100% 02 for the final 20mins of any dive. If possible Ill do this at 4m but if not ill do it at 6.

Running pure 02 for the last segment of deco has resulted in a noticeable improvement in post dive condition.

So in summery: deep is 80m+ and ill run 1.2 on the bottom 1.3 on deco and finish with 100% for the last 20mins

So far, so good

I am 44, fit ish (badminton three times a week golf twice) but a light smoker moderate drinker and at least two stone overweight.

ATB

Mark

silent running · 5th March 2008, 08:45

Quote: (Originally Posted by Gobfish1)

still no photo of you with out you're underwear ,, i have been looking forward and hoping all day ,,

ps

increased WOB think im holding some co2 thinking of you ,,

Mike, every day that passes without an answer to this impassioned request causes me to laugh harder. For god sakes, don't let this charade go on any longer and put the man out of his misery.

And if you're not looking for it, might I suggest you put up another avatar with less D-rings and without the headgear and spear?

osiris · 7th March 2008, 10:45

Quote: (Originally Posted by Drmike)

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

Uh, oh. I've seen this somehwere before.........

13th February 2008, 23:45	#51 (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: 3,128	Re: What setpoint for 100m+ diving do you use? Quote: (Originally Posted by Gobfish1) The standard A6 table used for a chamber ride need 650 OTU ,, i read ,,, some place ,, i never worry about OTU ,, We have a hypobaric Doc and chamber operators as part of our Thai support team for our big dives. As part of our procedures and in light of the long exposures we discussed the issue of OTUs and how that may influence or restrict any subsequent treatment. The concensus was that treatment is given as much as the individual can take regardless of previous OTUs due to the large variability between individuals. __________________ 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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14th February 2008, 00:06	#52 (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 Drmike) We have a hypobaric Doc and chamber operators as part of our Thai support team for our big dives. As part of our procedures and in light of the long exposures we discussed the issue of OTUs and how that may influence or restrict any subsequent treatment. The concensus was that treatment is given as much as the individual can take regardless of previous OTUs due to the large variability between individuals. to right ,, give to me , i want it , i need it , **** it let me have it , type of thing ,, shit or bust . we call it in manchester ,, the 650 OTU was posted , just for the great unwashed to dwell on, if it takes two doc's to work out, when ist shit or bust time .. just as well we let the great unwashed see why the OTU numbers are so ,, still no photo of you with out you're underwear ,, i have been looking forward and hoping all day ,, ps increased WOB think im holding some co2 thinking of you ,, __________________ 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 : 14th February 2008 at 00:50.
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14th February 2008, 13:42	#53 (permalink)
Jim Custom Title Allowed! Current Rebreather/s: Megalodon Other Rebreather/s: Inspiration Classic Join Date: Jun 2005 Location: Purley, UK Posts: 109	Re: What setpoint for 100m+ diving do you use? '''''still no photo of you with out you're underwear ,, i have been looking forward and hoping all day ,, ps increased WOB think im holding some co2 thinking of you ,,[/quote]'''' A bit off topic ..... and you certainly couldn't pay me enough pink pounds to check out any of you lot naked !! __________________ Jimbo
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14th February 2008, 19:00	#54 (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? __________________ 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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19th February 2008, 14:46	#55 (permalink)
*EBT* Apprentice Luddite Current Rebreather/s: Classic Kiss Other Rebreather/s: Inspiration Classic Join Date: Feb 2005 Location: UK, Brighton Posts: 1,855	Re: What setpoint for 100m+ diving do you use? Just remembered a link to a parallel discussion on DIRexplorers, where theres some interesting rubicon links/info posted by Gene. DIRexplorers discussion __________________ Eagles May Soar, but weasels don't get sucked into jet engines! Rebreather World Terms of service Real diving t-shirts for real divers
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5th March 2008, 06:01	#56 (permalink)
maayanh New Member Current Rebreather/s: Not Bought Yet Other Rebreather/s: Inspiration Classic Inspiration Vision Evolution Not Bought Yet Join Date: Jan 2007 Posts: 18	Re: What setpoint for 100m+ diving do you use? two questions, 1. how high do you let your cns clock on these kind of dives (110m, 25min bottom)? 100%, 150% 200% unlimited? 2. do you say on the mix the whole dive, I was taught to flush the loop with air@25m (surviving the ppN2 spike)
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5th March 2008, 08:06	#57 (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: 3,128	Re: What setpoint for 100m+ diving do you use? Quote: (Originally Posted by maayanh) two questions, 1. how high do you let your cns clock on these kind of dives (110m, 25min bottom)? 100%, 150% 200% unlimited? is there a choice? For me CNS depends on the dive - not the other way around. Quote: 2. do you say on the mix the whole dive, I was taught to flush the loop with air@25m (surviving the ppN2 spike) the later. BTW who is still teaching air flushes? __________________ 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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5th March 2008, 08:36	#58 (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: 2,470	Re: What setpoint for 100m+ diving do you use? Strangely on OC dives I always used to plan for 1.4 on the bottom. So my first 100m dive OC was 1.4pp02 on the bottom and 1.6 at 66m (21/35) 1.6 @ 33m (36%) and 1.6 at 10m on 80% For some strange reason I was always perfectly happy using the 1.4pp02 on the bottom of all my dives and often went above slightly due to fill errors. Id be happy pushing CNS to 150% but after that id start doing 15on/5off air breaks. Then I read some GUE stuff several years ago which suggested I shouldn't be running such high pp02s on the bottom and I should only use 1.6 from 21m and up. The research appeared to make a strong link between working and high PPo2 but I didn't quite follow why I couldn't use 1.6 on deep deco (deep for me being 66m) I decided to stick with my deep 1.6 as the stop times were so short it hardly seemed to matter. Then in 04 when I switched to CCR things got a lot more complicated due to the constant PP02. Now I was running 1.3 for everything. I did three dives between 96m and 105m running 1.3pp02 all the way. On one dive lasting just under three and a half hours I noticed signs of lung irritation. This was on a multi day trip with several dives below 60 that week. After this event I started introducing air breaks past 120 cns I haven't suffered any lung irritation since. Whilst I very rarely go past 90m I do do a lot of diving over 100% CNS due to long bottom times in the 60-80m range. A dive past 100m is a major event for me so Ill err on the side of caution. Because CCR has the odd spike and trough in PP02 I have gone with the generally accepted idea of running 1.2pp02 on the deeper dives. I believe in a max END of 25m so I tend to run a lot of He in the mix. I understand more He will reduce breathing resistance and decrease C02 retention. This to me is a good thing. I would never do any intentional hard work below 90m. If i found the telegraph it can just stay there. I am much more concerned about my level of work / stress at great depth than I am about my PP02 or He percentage. Since switching to CCR i have always ran 1.3 for deco till the last stop depth. Then I will run 100% 02 for the final 20mins of any dive. If possible Ill do this at 4m but if not ill do it at 6. Running pure 02 for the last segment of deco has resulted in a noticeable improvement in post dive condition. So in summery: deep is 80m+ and ill run 1.2 on the bottom 1.3 on deco and finish with 100% for the last 20mins So far, so good I am 44, fit ish (badminton three times a week golf twice) but a light smoker moderate drinker and at least two stone overweight. ATB Mark __________________ 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
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5th March 2008, 08:45	#59 (permalink)
silent running Mature mouth breather Current Rebreather/s: Prism Topaz Other Rebreather/s: Join Date: Jun 2005 Location: U.S.A. Brooklyn, New York Posts: 1,779	Re: What setpoint for 100m+ diving do you use? Quote: (Originally Posted by Gobfish1) still no photo of you with out you're underwear ,, i have been looking forward and hoping all day ,, ps increased WOB think im holding some co2 thinking of you ,, Mike, every day that passes without an answer to this impassioned request causes me to laugh harder. For god sakes, don't let this charade go on any longer and put the man out of his misery. And if you're not looking for it, might I suggest you put up another avatar with less D-rings and without the headgear and spear? Last edited by silent running : 5th March 2008 at 09:17.
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7th March 2008, 10:45	#60 (permalink)
osiris Custom Title Allowed! Current Rebreather/s: Inspiration Classic Sport Kiss Home Build Other Rebreather/s: Home Build Join Date: Feb 2006 Location: Auckland Posts: 231	Re: What setpoint for 100m+ diving do you use? Quote: (Originally Posted by Drmike) if you dont know what your talking about - why talk? Uh, oh. I've seen this somehwere before.........
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