Combined Primary Rebreather and Back up RB (BOB) dsv

jaap

OK

So you have the primary DSV in front, the BOB-DSV on one side and an OC-2nd stage on the other side? Any pics of the whole thing being worn?

How about the little water that gets inside the mouthpiece after the switch (must seal off BOB dsv water vent hole), drink it?

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Drmike

Anyone who dives a Nova mask with the side reg will tell you you dont notice it - sames true when add bob dsv - only bob dsv hose 'kink' is noticeable. Im looking at solving that by using side mount style dsv rather than nornal style

current set up is bit ugly and bulky but hell its for big dives where added safety more than compensates

you can blow out the water as your inserting the dsv (have to look up) but to be honest the vol is not significant and at the end of the day bob is an emergency thing and small bit of water is a negliagble concern

what i have also done is look up and let the water trickle into mouthbite and out into mask - its not a issue, to be honest in an emergency bail - who cares about such a small bit if water - just blow it into dsv

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Cave diving is a sport
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'Rebreather diving' is not a sport
its the delusional obsession with a highly dangerous and often inappropriate piece of equipment

Crazyduck

Mike,
Have you considered a gas routing manifold such as the MK5-P?
Link- Breathing apparatus gas-routing manifold - Google Patents

Bring both (inhale and exhale) hoses to your shoulders and then through a manifold out to a single hose to your FFM?
Just a thought…

Best Regards, Andrew

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Drmike

Hi Andrew, no I hadnt seen this - thanks for posting it.

My set up I think is simpler smaller and boris remains stock - but still this is an interesting solution, thanks

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Cave diving is a sport
Wreck diving is a sport
Diving in general is a sport

'Rebreather diving' is not a sport
its the delusional obsession with a highly dangerous and often inappropriate piece of equipment

paulraymaekers

I more like the completely separated system Mike is showing.

if something goes wrong in the manifold system, you're really screwed, cause both breathers are affected.

so just a DSV,P-plug, with both hoses coming from the same side, and it should be ok

nice thing Mike!

regards
paul

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netmage

Hey Matt, you'll have to finish the rest of the story Jill started in her rebreather history presentation this past weekend... Something about you nearly having your tounge yanked thru the DSV when equalizing the BOB...

Steve

I'm still amazed that anyone can breath enough through their nose to fight off a CO2 hit. I know this set up would never work for me due to a few too many taps on the beak playing rugby.

Given that you believe you can Mike, what is the plan when a bit of diving related congestin sets in? What is the backup? Is it needed?

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Drmike

Never said or suggested nose breathing for fighting off a co2 hit. Where did you get that from?

Nose breathing to me serves several purposes:

1) To add off board dil (handsfree)
2) To enable breathing while bailing to oc (fumbling for oc 2nd stages)
3) To enable breathing while switching primary to bob
4) As a quick sanity breath (not to fix but to avoid CO2)
5) to make it really easy to drink


In general I have found it an amazing stress reducer when you can ALWAYS breathe. Try bailing to OC - its very stressful largely because you have to pause/hold your breath while changing dsvs- which is fighting all your primal instincts which kick in when stressed or your RMV is high...this I have found can actually prevent someone bailing or delay their decision to bail until they are sure they have a real issue and by then it may be too late for them toi bail.. My 1st step before I do anything is initiate nose breathing then once my head has accepted the routine of that I can do whatever fancy shenanigans with the p-ports, bob, OC regs that I like.

BTW you dont have to use your nose. Try opening your mouth wide (so its off the internal mouthbite) and taking a big lung full of air - you will be amazed how low the WOB is - the side reg pumps in oodles of gas - much more than if normal OC as your mouth is wide open and your not biting hard down on the mouthbite and so restricting opening size which is a natural reaction when stressed. Of course exhale is not as low and I would not do this with the dsv removed for fear of flooding mask at worse possible time. Basically I wouldn't recommend (never did) to use side reg for stopping a co2 hit - but I would say the side reg GREATLY facilitates a bail to OC as the 1st stage (as you dont have to pause breathing)

I have had to use the side reg many times in anger and each time I really appreciated it being there

__________________
Cave diving is a sport
Wreck diving is a sport
Diving in general is a sport

'Rebreather diving' is not a sport
its the delusional obsession with a highly dangerous and often inappropriate piece of equipment