Considering a Bail-out rebreather

cedricverdier

Hi all,

I just published a new article about Bail-out rebreathers here:

http://www.rebreatherworld.com/home-...html#post59413

It's a first version as I need a lot of feedback to make this project happen.

If you already thought or designed or used a bail-out rebreather, please share your experience and knowledge. I would like to see a manufacturer really considering this market.

Thanks for your help.

__________________
Cedric Verdier
PADI Course Director, ANDI-IANTD-PSAI-TDI-DSAT-DAN-NAUI-CMAS Instructor Trainer
Trimix (CCR and OC) and Cave Diving Instructor Trainer

www.CedricVerdier.com
DIRrebreather member

decoweenie

I have 2 BOB units in various stages of progression:

• OMG C-96 tested to 72m in CCR mode. Working on more streamlining... This is a front-mount unit intended to be used as a BOB.

• "Un-named-yet" which is basically Classic Inspiration merged with EDO-04. Complete but no time to test dive yet... This could be used back-mount with supply gas on the side (ala EDO-style) or side-mount - not decided yet.

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"...after a while you get bored offering advice to a bull that like to keep butting the fence with its head rather than walking through the open gate..."

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Mdemon

I have been using a prototype system for a while now. Maybe I'm selfish, but I wanted equipment I could switch to quickly and was as standard as possible. My BOB is therefore integrated into my main unit, an Inspo Classic. The other mouthpiece sits under my chin so I'm as close to DIR as I'm ever likely to be...

I have basically strapped on Inspo lungs (backmounted), Inspo mouthpiece and hoses and a Drager FGT scrubber onto the back. I've borrowed a 3 cell PO2 monitor from Digger which fits into the inhale counterlung via PPort although right now I'm just using a single cell plumbed into my VR£. It's controlled manually using the O2 button. As an O2-Rebreather it's superb too and I was also pleasantly surprised to find that with care, the extra air space didn't make an ascent any more difficult. I still use 7li drive cylinders as this gives me some sanity breathing via BOV. The scrubber is mil spec and rated to 200m. It's a lovely breathe, but I want some scrims for it as I can sometimes taste slime dust. I haven't used it very deep yet "in anger", but the whole lot made it to 130m and back without falling to bits.

Ultimately, if/when the lottery remembers me, I will swap it out for another Classic and make it a true Twinspo. Prior to that I am looking into making it full eCCR myself.

Upsides: It's another rebreather. You don't get better bailout than that.

Downsides: At the moment it's bulky and not streamlined at all, but that will change when I finish the new backplate. It's veeeery heavy, and always will be. This means the design has to be modular so I can remove the second loop for the easier dives.

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www.southwestmafia.com

It's as easy as abc;

a) "Carry adequate bailout"

b) "If in doubt, bail out"

c) "Always know your PO2"

If you find that hard, stick to crochet.

"Once the agenda-monkeys and perfect-worlders have moved on, perhaps we can do some diving?"

Marc T

Hi decoweenie,

I know you know the EDO04 very well ( back on it so?? )
Just a thougt concerning the EDO reaction to an accidental opened loop ( disconnected hose or so ) you got no flood but an enormous freflow which is able to emptied you tanks in seconds if its occured in depth.

Actually Im always using my mCCR turned- EDO04 and a back mounted BOB with Kiss like counterlungs..
Double breather is a pain cause there is much more possibility to be killed on such a complex rig ( many more hose connection and failure point) and not sure that's the right tool to save your life if needed.
Cedric is right when saying you need plenty of oC gaz in an emmergency situation. Co2 hit with not enough gaz and your dead
So a better way is to consider that the BOB is only able to Help you for an emmergency deco.

Just my two cents ...

Marc

decoweenie

Marc,

To be honest, you lost me as I didn't follow the warning you mentioned.

Yes, a few years back, I converted the EDO-04 to mCCR (link @ XCR) and really enjoyed diving it for a while. Then I needed to buy some other units thus selling it to a friend who dived it only as a SCR...

The unit I have done is simply adding the CL at the bottom of the scrubber, and the rest of the functions remain the same.

See picture...

Attached Images

EDOPhi.jpg (30.4 KB, 671 views)

__________________
"...after a while you get bored offering advice to a bull that like to keep butting the fence with its head rather than walking through the open gate..."

- Rebreather World PM

Marc T

When your loop is accidentaly opened underwater, the EDO 04 counterlung is collapsed but because of is very special design ( perhaps you've changed it )he touch one of the two ADV system and create a constant flow except if you maintain the bottom of the Rebreather swallower than is top, and its difficult if it is backmounted.
So you must be able to cut the gas flow.

The modifications are from you or from Arno? I see the EDO O8 in the back of your pic

Cheers

Marc

decoweenie

I understand what you are saying, but it would only happen under very specific conditions:

• take DSV out without closing.
• hold DVS above head in horizontal position, or face level in vertical.
• flip DSV to face upward
• ...

IMHO, the accordion doesn't have enough "spring" to contract upward against the weight of the OPV plate to force all of the gas out of the loop and activate the diluent regs.

Anyway, that's a lot of mess up sequences to happen.

Arno did it for me as I rather be a Rebreather diver, not a RB technician...

__________________
"...after a while you get bored offering advice to a bull that like to keep butting the fence with its head rather than walking through the open gate..."

- Rebreather World PM

PacketSniffer

What ever became of the TP2000/TP3000?



.

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Far better it is to dare mighty things, to win glorious triumphs, even though checked by failure, than to take rank with those poor spirits who neither enjoy much nor suffer much, because they live in the gray twilight that knows not victory or defeat.

johnv

with the lung this low, it's going to breathe like a pig when sidemounted (if you can exhale at all when vertical) :-(

you need to mount this shoulder height to make it breathe well.

good luck though.

decoweenie

Yes, people have told me that. And the same people told me the Rebreather-80 or EDO-04 breath like pigs as well.

I found the latter part complete rubbish when I did the XCR project. The WOB was so nice that I had to stick my fingers in the tube to check if the CL is moving.

Of course, this was in horizontal position. In vertical position, the WOB is higher no doubt - but I don't dive vertically except at the surface.

I have difficulty seeing how the WOB will be different when the unit is on my back or on my side - in horizontal mode. If anything, on the side will place it in the same water column as my lungs.

If I could exhale out to the C-96 (sits below me in horizontal position), I think it shouldn't be too bad on the side.

However, if I am wrong, then it could still be used back on the XCR mode (on my back with twin supply tanks) except it is now an eCCR instead of mCCR. Or use as an emergency bail-out unit at deco station for deep dives. Etc...

All is not lost...

__________________
"...after a while you get bored offering advice to a bull that like to keep butting the fence with its head rather than walking through the open gate..."

- Rebreather World PM