Deep air on OC vs. CCR

Gilles · 9th January 2007, 08:01

Us Canadians like to use the metric system
(it is tops really)

Air
CC:40m
OC: 50m

**nigelh** · 9th January 2007, 09:06

Quote: (Originally Posted by sabgia)

Air
CC:40m
OC: 50m

I'd agree with the difference but make it 30 and 40m.

OK. On both systems, if there isn't a problem I could manage the dive far deeper than that even with my brain full of nitrogen but I have to plan for problems and I don't carry a backup brain. As has been pointed out CC trimix is cheap.

Marc T · 9th January 2007, 09:55

Dont forget that if you have to bailout in SCR mode your END will dramaticaly be increased ( +10 m or way more in seconds ) at a very bad moment!

lizardland · 9th January 2007, 09:56

I use air dil to about 30m on CCR if I had to, I'd probably stop at 40m on OC air (my deepest was 90m on air in open water and 75m in caves, neither were pleasant). I don't tend to use air dil as I keep 18/40 banked and decant off that for most diving (with air top offs for shallower dives). I've never had an air dil past about 25m so I've no idea if the narcosis is similar to OC. It costs relatively nothing so I generally have some helium in my dil whatever the depth.

robvdmr13 · 9th January 2007, 10:38

Air
CC 30 m
OC 40 m

Once upon a time I didn`t notice anything at 50 m (dark, 4 degrees C). Then came along trimix. From that point on, I really started noticing the narcosis even at 30 m (OC). With CC, I usually use some helium were I would otherwise use air. Doesn`t change deco and you are that bit sharper.

Robert

Mdemon · 9th January 2007, 10:57

Warm, clear, no-stress bimbles in the Red Sea were fine at 50-60m.

Much deeper and it became obvious that this was Mix territory.

jhaaja · 9th January 2007, 10:57

Quote: (Originally Posted by lizardland)

I use air dil to about 30m on CCR if I had to, I'd probably stop at 40m on OC air (my deepest was 90m on air in open water and 75m in caves, neither were pleasant). I don't tend to use air dil as I keep 18/40 banked and decant off that for most diving (with air top offs for shallower dives). I've never had an air dil past about 25m so I've no idea if the narcosis is similar to OC. It costs relatively nothing so I generally have some helium in my dil whatever the depth.

I also bank one diluent for all my cc diving. I like to keep things simple if that is possible on cc

Gobfish1 · 9th January 2007, 11:26

Air
CC 40m
OC 60 m

Ps the only time I have used air dill is on my mod1
On all my dive s since mod1 have been on a trimix dill, end of 25m/30m

Doppler · 9th January 2007, 12:11

I would like to ask this crowd (given the pn2 being equal) have any of you found the difference in thermal stress between OC and CC has a descernable effect on your perception of narcosis?

Thanks

heigo · 9th January 2007, 12:26

80m oc
60m ccr

Mainly because i cant get any helium.

9th January 2007, 08:01	#11 (permalink)
Gilles Worship the feminine Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Sep 2005 Location: Den Haag (Netherlands) Posts: 762	Re: Deep air on OC vs. CCR Us Canadians like to use the metric system (it is tops really) Air CC:40m OC: 50m __________________ Gilles http://www.dirrebreather.com
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9th January 2007, 09:06	#12 (permalink)
nigelh New member Current Rebreather/s: Inspiration Vision Other CCR Other Rebreather/s: Inspiration Classic Other CCR Join Date: Mar 2005 Location: Brighton, Sussex, UK Posts: 883	Re: Deep air on OC vs. CCR Quote: (Originally Posted by sabgia) Air CC:40m OC: 50m I'd agree with the difference but make it 30 and 40m. OK. On both systems, if there isn't a problem I could manage the dive far deeper than that even with my brain full of nitrogen but I have to plan for problems and I don't carry a backup brain. As has been pointed out CC trimix is cheap. __________________ nigelh
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9th January 2007, 09:55	#13 (permalink)
Marc T hell is in the details Current Rebreather/s: RB80 / Clone Home Build Other Rebreather/s: Not Bought Yet RB80 / Clone Home Build Join Date: Sep 2005 Location: FRANCE Carcassonne Posts: 498	Re: Deep air on OC vs. CCR Dont forget that if you have to bailout in SCR mode your END will dramaticaly be increased ( +10 m or way more in seconds ) at a very bad moment!
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9th January 2007, 09:56	#14 (permalink)
lizardland Yak Current Rebreather/s: MK 15.X Home Build Other Rebreather/s: Classic Kiss Home Build Join Date: Mar 2005 Location: North... Posts: 1,387	Re: Deep air on OC vs. CCR I use air dil to about 30m on CCR if I had to, I'd probably stop at 40m on OC air (my deepest was 90m on air in open water and 75m in caves, neither were pleasant). I don't tend to use air dil as I keep 18/40 banked and decant off that for most diving (with air top offs for shallower dives). I've never had an air dil past about 25m so I've no idea if the narcosis is similar to OC. It costs relatively nothing so I generally have some helium in my dil whatever the depth. __________________ Can you imagine drifting along in the sea with your mouth open and a load of f***ing plankton going in? You'd like it, would you? www.westons-cider.co.uk Azerbaijani Association of Technical Divers Publicity Officer and Goat Wrangler
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9th January 2007, 10:38	#15 (permalink)
robvdmr13 New Member Current Rebreather/s: Inspiration Classic Dolphin Other Rebreather/s: Dolphin Join Date: Jan 2006 Location: The Netherlands Posts: 44	Re: Deep air on OC vs. CCR Air CC 30 m OC 40 m Once upon a time I didn`t notice anything at 50 m (dark, 4 degrees C). Then came along trimix. From that point on, I really started noticing the narcosis even at 30 m (OC). With CC, I usually use some helium were I would otherwise use air. Doesn`t change deco and you are that bit sharper. Robert
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9th January 2007, 10:57	#16 (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: 1,946	Re: Deep air on OC vs. CCR Warm, clear, no-stress bimbles in the Red Sea were fine at 50-60m. Much deeper and it became obvious that this was Mix territory. __________________ www.southwestmafia.com "small minds talk about people, Average Minds Talk About Events, GREAT MINDS TALK ABOUT IDEAS!" The WRONG Attitude will get you killed. "Once the agenda-monkeys and perfect-worlders have moved on, perhaps we can do some diving?"
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9th January 2007, 10:57	#17 (permalink)
jhaaja Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Mar 2005 Location: Finland Posts: 885	Re: Deep air on OC vs. CCR Quote: (Originally Posted by lizardland) I use air dil to about 30m on CCR if I had to, I'd probably stop at 40m on OC air (my deepest was 90m on air in open water and 75m in caves, neither were pleasant). I don't tend to use air dil as I keep 18/40 banked and decant off that for most diving (with air top offs for shallower dives). I've never had an air dil past about 25m so I've no idea if the narcosis is similar to OC. It costs relatively nothing so I generally have some helium in my dil whatever the depth. I also bank one diluent for all my cc diving. I like to keep things simple if that is possible on cc
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9th January 2007, 11:26	#18 (permalink)
Gobfish1 RBW Member Current Rebreather/s: Inspiration Classic Other Rebreather/s: Inspiration Classic Inspiration Vision Evolution Join Date: Apr 2005 Location: Manchester UK Posts: 399	Re: Deep air on OC vs. CCR Air CC 40m OC 60 m Ps the only time I have used air dill is on my mod1 On all my dive s since mod1 have been on a trimix dill, end of 25m/30m __________________ 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 : 9th January 2007 at 12:00.
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9th January 2007, 12:11	#19 (permalink)
Doppler Cut along dotted line... Current Rebreather/s: Inspiration Classic Evolution Pelagian Other Rebreather/s: Pelagian Join Date: Mar 2005 Location: Not Basingstoke... thank god Posts: 188	Re: Deep air on OC vs. CCR I would like to ask this crowd (given the pn2 being equal) have any of you found the difference in thermal stress between OC and CC has a descernable effect on your perception of narcosis? Thanks __________________ Steve Lewis "Why settle for reality when there are so many cheap alternatives..."
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9th January 2007, 12:26	#20 (permalink)
heigo Petri Keskitalo Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Jun 2005 Location: Thailand/Sweden Posts: 114	Re: Deep air on OC vs. CCR 80m oc 60m ccr Mainly because i cant get any helium. __________________ P3
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