DIR CCR?! say it isn't so!

[Nailer99]

The 02 bleed from the constant flow is really, really slow. It would take a long time to affect either buoyancy OR P02. I don't know how much time, but assuming constant depth, I bet it would take more than 5 minutes to raise the loop P02 by even so much as .1. (I'll have to measure that sometime....)

I don't dive a COPIS, so maybe some of the guys here who do can answer...

It keeps delivering O2 whether you are breathing or not.

So if you go off the loop, it keeps slowly inflating your system with O2 whilst you get the donation situation sorted out.... Isn't there going to be a high PO2 issue along with an increasing buoyancy issue from CL?

You are going to have to be venting your counterlungs while dealing with a potential flail fest, correct? Are they turning their O2 off while donating? and if not, the protocol is a Dil flush before going back 'on the loop' I'm guessing, or do they just plan to stay on OC?

I'm just curious, as it seems to me the protocol for the RB80 can't simply be transferred directly over.

I would almost feel like having an eCCR in this situation would be better, as the solenoid would not keep injecting if the setpoint had been maintained and you were off loop.

[JS1scuba]

I dive a kiss with a Bail out valve -- if there is a problem you switch of OC with the turn of a knob. It's seamless transition for "sanity" breaths and then you sort it out.

Yes, LJ it will continue to flow a small amount of O2 into the bag to the point where 1. the bag burps 2. the PO2 is higher than when you left the bag. If you have sorted out the problem going back on the loop is pretty easy. Take BOV in mouth, exhale lung gas, open bov, inhale loop gas, close bov, exhale, open bov, inhale, activate ADV and add a little dil. Stabilize and go.

Remember that the body can tollerate super high levels of oxygen for very short periods of time. The time it takes to flush out the loop is pretty short. But also keep in mind that if the original PO2 was reasonable and the bag was at an optimal volume the most that will happen is the P02 will double (more o2 feed) so if you were at 1.3 you now are at 2.6 atm po2... not entirely untollerable for short period. Flushing the bag is easy. On FMCLs doing the dil flush is as easy as pushing a button. On BMCL units it's a little more effort but not hard to do at all.

The BOV is probably the single best tool for getting off the loop quickly and maintaining control. If you have not dived with one, borrow one and fit it on your rig for a few dives, you will love it.

Cheers
JDS

[JS1scuba]

Why not post these over on the UTD board?

When I get a moment I might. In the meantime it's here and where I am conversing.

Why not answer them here ?

[amascuba]

When I get a moment I might. In the meantime it's here and where I am conversing.

Why not answer them here ?

I've already answered. I don't dive a rebreather. I don't anticipate a need for a very long time, but I still try to keep educated on at least the basics of what's developing.

[dsteding]

When I get a moment I might. In the meantime it's here and where I am conversing.

Why not answer them here ?

Part of it is because it won't get the feedback of the people that put this together, and Doug Williams' head might explode if he has to go over there

I pointed Josh to that thread, and I think it could benefit from your (speaking to you Joel) input as well.

[JS1scuba]

I've already answered. I don't dive a rebreather. I don't anticipate a need for a very long time, but I still try to keep educated on at least the basics of what's developing.

Not you silly. The other guys.

When I get back from Nevis you should hop out here and dive with us. We found a new deep area in the lake. It's pushing 95 feet with lots of contours, cuts, and geology.

[JS1scuba]

Part of it is because it won't get the feedback of the people that put this together, and Doug Williams' head might explode if he has to go over there

I pointed Josh to that thread, and I think it could benefit from your (speaking to you Joel) input as well.

I took a look over there -- at first i was i was not able to navigate the system easily. I was able to get a post up. Let's see what results my query gets.

Overal the idea is ok but it seems the execution is a bit convoluted. If I have learned anything about diving in the short time I have been doing it simplicity is the key.

Cheers
JDS

[dsteding]

I took a look over there -- i was not able to navigate the system easily. If I get some time I will try to.

Overal the idea is ok but it seems the execution is a bit convoluted. If I have learned anything about diving in the short time I have been doing it simplicity is the key.

Cheers
JDS

Yeah, the board is a bit difficult to find your way around on at first:

http://www.unifiedteamdiving.com/gro...mccrrebreather

I agree re simplicity. In fact, it is one of the driving principles of this approach to diving. Obviously, I'm biased because I've been trained by Andrew, but, remember, Leon worked closely with him on this. I think it is worth hearing the reasons behind things. Believe it or not, I called up Josh and chatted with him a fair amount about the whole thing--because I value his perspective as a "been there, done that" Meg diver.

[JS1scuba]

Yeah, the board is a bit difficult to find your way around on at first:

http://www.unifiedteamdiving.com/gro...mccrrebreather

I agree re simplicity. In fact, it is one of the driving principles of this approach to diving. Obviously, I'm biased because I've been trained by Andrew, but, remember, Leon worked closely with him on this. I think it is worth hearing the reasons behind things. Believe it or not, I called up Josh and chatted with him a fair amount about the whole thing--because I value his perspective as a "been there, done that" Meg diver.

Doug, me thinks you miss my point. I'm interested in hearing about this. I like to know reasons and methods for new or renewed approaches to things. Then, I may have enough qualified information to form a new opinion or not.

Cheers
JDS

[Rainer]

And this is the wrong board on which to ask since none of the UTD guys who took the CCR class read these posts... (at least, I can't remember the last time Andrew posted here.)

If you want answers (and to see Doug's head explode), your best bet is the UTD site.

Edit: And I agree, it's a terrible site to navigate. Oh, and I see you've posted there, Joel. With any (rather, a ton of) luck, maybe we'll get some answers...

[JS1scuba]

Edit: And I agree, it's a terrible site to navigate. Oh, and I see you've posted there, Joel. With any (rather, a ton of) luck, maybe we'll get some answers...

I don't recall having a mouse in my pocket. Though if someone can gleen some benefits from some questions I have posed then I suppose it's ok.

[rogerbly]

yeah, UTD is a better place for this particular discussion.

[sunnyboy]

.

[dsteding]

Doug, me thinks you miss my point. I'm interested in hearing about this. I like to know reasons and methods for new or renewed approaches to things. Then, I may have enough qualified information to form a new opinion or not.

Cheers
JDS

I get that Joel--and I agree, that is the right approach here. Gather information, make informed decision. It is just tough to get that information when Andrew isn't on this board.

[jkhaywood]

For GUE, the only CCR option is "the fridge" - the RB80. They are hellishly expensive, and the training is very rigorous (as are the pre-requisites to begin).

The RB-80 is an SCR, the "fridge" is not the RB-80 but the earlier halcyon rebreather.