Rebreather World - View Single Post - Diluent / Bail-out / Deco Line gas choice

Gilles · 14th June 2007, 00:59

I had hoped to get more than statements on how little we know. I/we knew that already.

Quote: (Originally Posted by Mark Chase)

Pot meet Kettle

(He said franticly trying to avoid the tirade of verbal abuse

)

ATB

Mark Chase

Let's give you some icon abuse, instead.

Quote: (Originally Posted by wondersea)

But I want dive light.

That's right, logistics is for diving by myself with my boat, my friend. In France, I can't use the Meg in Dive center because not CE

8/62 is an heliair and since we add oxy with the CCR what is the problem with this mix ? Easy to make and refill. I try to have NOT change of FN² when you change gas or the minimum ! And I have to join my basic deco line with some existing gas (18/44).

Well, I want dive light so 7L or 10L max sidemount that's all. First BO1 (8/62)is same as diluent so can be use as diluent or if bailout it will be the first breathing just time to take deco procédure look what I have to do and go to first stop. Anyway I can't breath it later so I use it to prepare deco. Then BO2 (12/57) give me time to deploy SMB or join deco line and start deco procedure. Anyway, with small tank like this I can't do more thing.

Just to be ready at the deco line and join correctly and smoothly the %mix of the first tank of the deco line.

Is that wrong strategy ?

Unless you are willing to go alpinist, there may be no other way to prepare adequate bailout for a 100m dive.

The stress from something going so wrong, requiring abandonment of your loop, will boost your RMV, and as Mike alluded to, the worst place will be at your turn around point.

A full ali80 tank will last 5 minutes at 100m with RMV 40L/m.

One may argue your 8/62 gas mix is unnecessarily hypoxic. Also when using this, your penalizing yourself with more deco obligation when you have bailed out to it.

Gas switching on bailout is needed and I have used Po2=1.5, and dPinert <= 0.5 ATA as criteria at switch point in the above example.

Then there are optimizations with team members.

There is an excellent thread titled "100m dive bailout" or similiar. Search and read. There is much to learn from it.

14th June 2007, 00:59	#50 (permalink)
Gilles Worship the feminine Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Sep 2005 Location: Den Haag (Netherlands) Posts: 762	Re: Diluent / Bail-out / Deco Line gas choice I had hoped to get more than statements on how little we know. I/we knew that already. Quote: (Originally Posted by Mark Chase) Pot meet Kettle (He said franticly trying to avoid the tirade of verbal abuse ) ATB Mark Chase Let's give you some icon abuse, instead. Quote: (Originally Posted by wondersea) But I want dive light. That's right, logistics is for diving by myself with my boat, my friend. In France, I can't use the Meg in Dive center because not CE 8/62 is an heliair and since we add oxy with the CCR what is the problem with this mix ? Easy to make and refill. I try to have NOT change of FN² when you change gas or the minimum ! And I have to join my basic deco line with some existing gas (18/44). Well, I want dive light so 7L or 10L max sidemount that's all. First BO1 (8/62)is same as diluent so can be use as diluent or if bailout it will be the first breathing just time to take deco procédure look what I have to do and go to first stop. Anyway I can't breath it later so I use it to prepare deco. Then BO2 (12/57) give me time to deploy SMB or join deco line and start deco procedure. Anyway, with small tank like this I can't do more thing. Just to be ready at the deco line and join correctly and smoothly the %mix of the first tank of the deco line. Is that wrong strategy ? Unless you are willing to go alpinist, there may be no other way to prepare adequate bailout for a 100m dive. The stress from something going so wrong, requiring abandonment of your loop, will boost your RMV, and as Mike alluded to, the worst place will be at your turn around point. A full ali80 tank will last 5 minutes at 100m with RMV 40L/m. One may argue your 8/62 gas mix is unnecessarily hypoxic. Also when using this, your penalizing yourself with more deco obligation when you have bailed out to it. Gas switching on bailout is needed and I have used Po2=1.5, and dPinert <= 0.5 ATA as criteria at switch point in the above example. Then there are optimizations with team members. There is an excellent thread titled "100m dive bailout" or similiar. Search and read. There is much to learn from it. __________________ Gilles http://www.dirrebreather.com Last edited by Gilles : 14th June 2007 at 04:27.
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