Bailout cylinders or a BOB ?

colinicky

If you had a choice on dives 50+metres would you use cylinders or a bail out breather ? Have never used a Bob or even seen one but am thinking one might be lighter than stages .This is for wreck dives in open ocean not caves

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Colin

I trust my rebreather completely ,
I just don't trust the user

onwards & downwards

Meng_Tze

I would say it depends on the dive. There are pros and cons to each solution. I see a BOB as necessary if carrying bail out bottles becomes cumbersome. If it is a matter of switching to bottle(s) and going up, I would carry bottles. If you are 20,000 ft in a cave and need to bail out, while setting up bottles along the way is possible, a BOB is probably easier....

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Homo Bonae Voluntatis

colinicky

Fair point so I have refined the op

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Colin

I trust my rebreather completely ,
I just don't trust the user

onwards & downwards

paulraymaekers

just my 2cents :-)

as long as you can get up safely with 2 stages, don't even think of BOB: there is some complexity involved in diving 2 breathers

good viz, no current, warm, ... if I can get up with 3 stages, no BOB

4 stages... for me I would perhaps try BOB... but as I never dived/tried one, don't know :-)

paul

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www.rEvo-rebreathers.com

.... the earth is flat, Elvis is alive, and radial scrubbers give longer dwell time than axials...

Dsix36

At this point, I am not going deep enough that I will need more than 2 BO bottles. BOB would be too much to deal with for me.

BO=easy
BOB=complex

just an idiot's 2 cents

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THE MORE THAT I LEARN, THE MORE THAT I STILL NEED TO LEARN!!!!!!

Andy Del

50m to 80m it's pretty easy to go with 2 stages and make a complete bailout ascent safely.

It's deeper than this that carrying stages gets one to look at other possibilities. One is a BOB. There's a BOB carcass in my shed awaiting some time and drive to try to resurrect it. Other viable options include team bailout, or staging gas on a deco station (have been doing this very sucessfully)

Even using these altenatives, 120m dives mean carry 3 stages (11L allys!) to be able to cope with worst case scenarios. Then there's 2 more stages on the deco station - 5 stages in all!

What is lacking is an affordable (HA!), or at least easily available BOB! I'm toying with ideas all the time and have no doubt that one day a BOB will be part of my planning.

Learning to dive safely with it would be the next task...

cheers

Andy

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Yellow - the colour of greatness!

Drmike

On dives that need a lot of bail gas I wear up to 4xAL80s bail. If the dive needs more and its not easily staged/team carried, I take BOB but I still take a couple of AL80s......why not? Also with a bob the O2 supply is now the critical factor so wise to take extra O2 or use a Y valve.


When first using a bob it failed on average about 50% of the time, now its reliable......but not as reliable (never will be) as OC bail tanks.


50m wreck I wouldnt bother with a bob. Bottom gas easily carried and deco gas easily staged.....and Id rather deal with 3 AL80s and a stage - than a bob and spare O2. (Due to fact BOB still fails from time to time adds complexity) and still takes up 2 'spaces' (for bob and for backupO2)

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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

PacketSniffer

Dr. Mike,

Can you please list the failures and briefly state which failures occurred when in the BOB's life?

Thanks

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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.

Drmike

mentioned in a thread here before, a search should locate it.

But basically flooding is your enemy

Have to ensure adv always plugged in, tank valve always open, adv always turned on etc etc.


Just need some good protocals in place to deal with it,now they are developed (and practiced) no issues

(For eg now I actually to a small degree use the Bob as part of bouyancy to ensure flood can never happen )

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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

Marc T

IMHO When youll be as easy and confident with your BOB alone as with your main one, then you can imagine to stay alive and going back home with one of your Rebreather flooded ( for ex ).
I play that game on cave diving because its necessary and because relatively less buoyancy problem.
I Dont imagine to do that in the see for shallower than 120 m.
And I dont want to imagine the number of wasted test dives in seawater before being safe.
Now that Im easy with that (in cave only ), Im very pleased to dive only one Rebreather with OC bailout and only a BOB staged somewhere.