Twinspirations/BOBs and the like...

[Mdemon]

I met a very nice ex-diver the other day who offered me his 5 ton lift bag...

Some potential there...
16 x 7l anyone?

Originally Posted by el_presidente

haaa

never forget the spidge option, what would you do if you found ultimate spidge and had no oc gas, uypou would be wounded there is one option of taking some bags with the bottles on and carry round a reel of rope, fir the bag with the rope tie on the spidge and get the boat to pull it up, but i think 9i would rather carry a cylinder than that!

a one litre crck bottle wouldnt be enough at depth, i have blown two full sevens blowing some nice spige need some serious gas volumes

[DecoWarrior]

five ton would be nice wouldnt have to bother workin stuff you could just lift the whole thing!, and sort it on the surface, know any one know where i could get a job lot of 7's for a 5 ton bag?

good to see we are back on the important points and not wasting time on trivia like what am i agoing to do for bailout do and stuff, worry about that when the spidge is on the boat!

[nigelH]

Originally Posted by Mdemon

As far as strategies are concerned, that was one of the reasons for looking at the 2nd RB. (I'm working on the assumption that bailout will be to the autoair or its replacement in the first instance. Then to the 2nd RB once the nerves have calmed down...)

For crying out loud man how often do you think you need to bail out?

For me, and for a lot of people with far more hours than me, it is only on a course when a card saying "LOW OXYGEN" or the like suddenly appears in your face.

The idea of having to maintain and clean a second rebreather for those once every few years occasions seems mad overkill. I will carry two stages tops and normally just one and that will get me out bent for the worst case of a sudden joint total loop floods for both me and my buddy but for anything where I can get something from the loop I will go back on it after a couple of OC breaths to check my sanity.

Only the cave diver, who cannot follow "get shallow - get onto oxygen - asap", has a case for a backup rebreather but they will pay for it in labour terms. Even if you think the scrubber is getting tired or compromised semi-closed mode will act as a gas extender and keep the loop CO2 down.

nigelH

[DecoWarrior]

nigel

i agree fully

and as for alpinist, i can see the advantages, however the argument that how many times do you need to bail out is all well and good except fpor the one time you need to bail out, then all the trouble free dives in the world aint going to save your ass when you need the gas and you aint got it!

[Mdemon]

Hi Nigel,

you forgot the <SLAP!>

By curious coincidence of timing, just got this off the List (the site owner is asking for opinions)...

http://www.therebreathersite.nl/bailout_ccr.htm

[And]

Bailout rebreather!

You'd have more drag than a Blackpool nightclub!

Andy

[Mdemon]

Originally Posted by And

Bailout rebreather!

You'd have more drag than a Blackpool nightclub!

Andy

Follow the link above...

I think it compares well with a couple of stages, regs etc




...and which Blackpool nightclub and how do you know????!

[DecoWarrior]

i think it looks like a bag of shite!

[Mdemon]

Conclusion?

It seems;
A BOB is the more practical style
It needs to be streamlined and no larger than a stage
It needs to be full CCR
It needs an ADV
It needs an autodump or some method of making the ascent "hands-off"
It needs to allow instant OC bailout (via the ADV) until the diver is ready to fly it CCR
It needs to be "sealed" - in other words it needs to remain clean, sterile and dry long term until/if it is needed
It needs minimal/no setting up pre- and post-dive
It needs to cope at least with prolonged deco (up to 2 hrs?)
It needs PO2 monitoring

It should be at the correct mix always, for instant use
It should be robust enough to treat like a stage
It should be cheap

Have I missed anything?

Having acquired a YBOD so I will always have enough gas, it seems daft for me not to think the same way about bailout. And as far as extra hassle is concerned, I don't find the YBOD is that complicated, so why should a BOB be overwhelming? Filling a stage with the correct mix would take as much time.

[Rob Evans]

Ere John - it's just occurred to me..... When you say BOB, are you using it as a generic term for a 2nd rebreather to bail to? BOB, to me, means the one that Gordon Smith was mucking about with a few years ago - it got an article in 9-90 IIRC & then nothing more was heard. Very neat idea, I thought.