Passive Scr Superiority?

db8us

Which one with an Rebreather-80 ?

gtzavelas

adding up:
eCCR: 45
pSCR: 3
mCCR: 0

this I think has a quite clear significance...

any (guess)estimate on on the nuber of units out there?

lizardland

Unfortunately, with rebreathers if you ask an owner if their rebreather is good/safe then generally the answer is yes.

I considered a PSCR and did some test diving on a unit to see if I liked it. To me it took more than just listening for the dump...

As someone else mentions, you need to look at the whole dive not just the mechanics of the unit. Issues that turned me off it:

- increased drag, you become more scooter reliant on a cave rigged unit
- increased weight, entry & exit becomes difficult, moving over rough ground not easy leaving a big potential for getting hurt. I dive solo a lot, that was too big a risk.
- vulnerability of the bellows to getting jammed up with gravel, I didn't feel confident I could clear it myself if it happened
- vague sound of the dump, hard to hear in open water or around scooters
- ambiguous sound: the dump sounds exactly the same as exhaling into a flooded loop. Combined with the hard breathe it was hard to relax.
- limited depth range for drive gases, the biggie. I wasn't comfortable on the whole procedure for swimming into shallower water.
- complicated hose routing: the system I used had a complicated gas switching block and offboard plumbing system, it was a leap of faith when the owner explained to me what I was breathing, it was difficult to trace what was what
- difficult breathe: I found it a harder breathe than OC, I really would not like to deal with it on a hard swimming dive. It was very tiring.

To me, these were all safety issues which to my thinking is just a long a list as there were for the KISS. It's a different list but it's still a long list. I think it is a great system but it's a tool for a certain job and it wasn't the tool I needed.

Is it any more or less safe than any other rebreather? Who knows.

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decoweenie

I am guessing the number of users...

• eCCR 7000-8000 (YBOD, MK-15, Meg, Optima, Meg, etc)
• pSCR 20-50 (PVR-BASC, Rebreather-80, clones)
• mCCR 400-600 (Classic KISS, Sport KISS, rEvo, KISS-convert, etc)

So the accidental rate percentage would be...

• eCCR 0.5%
• pCCR 6-10%
• mCCR 0%

Just a number game now, isn't it ?

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Marc T

Same for me

Marc T

Looks more like a number joke isnt it

decoweenie

Take a guess at the number of units sold if you have better information.

Let's say 200 pSCR units sold (hell must be freezing over ), still 3/200 ~= 2%

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Janos

Indeed. It is a numbers game.

The problem with any attempt to analyse diving stats is that:

(a) The sample size is mercifully small
(b) There is little, if any, information on the number of dives being done, or the depth / complexity of those dives.

Taking it to extremes, the obvious way to make your dive safer is to wear a blue drysuit with pink spots, as this clearly must give the diver some degree of invincibility, as there have been no fatalities of divers with blue pink-spotted drysuits.

So - anyone selling their bailout bottles?

Janos

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EBT

Chaps,

This numbers game is proving nothing.... dumb analysis like this is the bane of my life and serves only to help people who wish to promote a position (like politicians/marketeers/managers).

Draw whatever conclusions you feel happy with or can justify, but I personally think the numbers are merely a blunt tool, much like knowing that australia is south of the UK. Whilst its factually correct information, its a long way from showing you how to get there.

To actually figure out the real significance of this data, you'd need to analyse a lot more than unit type. For starters theres training, operational/procedural wrap, attitude etc etc etc.


/Zak

PS. To my knowledge the alledged RB80 death was in fact on a clone unit, not that it matters.

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decoweenie

Oooh! You are asking for it now...

Popcorn and a coke please! (I am sitting down to watch the fireworks)

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