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**Gill Envy** · 31st March 2008, 16:36

After watching a solenoid stop working mid dive and then start working spontaniously (and that was after a trip back to the hatchery) I've come to the conclusion that eCCR's need an even shorter monitoring interval than mCCR's as you have no MFO and even less time to react to a failing set point controller and no obvious way of calculating the timing of a failure. Having looked hard at the stats, and compared my behavior on eCCR vs mCCR I don't even think one's greatest risk on an eCCR is controller failure though, but rather the propensity to become too lax and trusting that a "force beyond yourself" is going to catch you when you fall... to barrow a term, "function creep", is the siren call of eCCR's (the propensity to over rely on a device because of the ease of it's availability).

If I were diving any CCR with my eyes closed, I'd be off the loop if I could not see my HUD or wrist unit, lickety split if the situation did not resolve by the time I ran out of gas then i'd go back on the loop and continue SCR. I have to say, diving in cold murky water, i've been in plenty of situations where I could not see two inches in front of me but i've never not been able to see my HUD and since it gives me real time po2 on all three cells, i'm able to continue flying it with a relative degree of confidence.

that said, if my head was being held down in the mud, hands tied behind back, unable to push HUD against face plate or inject o2, or bail out ... I'd simply revert to the old "in case of nuke" drill: put head between legs, kiss ass good bye! ... on any rebreather.

31st March 2008, 16:36	#35 (permalink)
Gill Envy Shearwater Copis Diver Current Rebreather/s: Other CCR Other Rebreather/s: Evolution Other CCR Join Date: Nov 2005 Location: seattle Posts: 1,302	Re: mCCR and zero viz exit After watching a solenoid stop working mid dive and then start working spontaniously (and that was after a trip back to the hatchery) I've come to the conclusion that eCCR's need an even shorter monitoring interval than mCCR's as you have no MFO and even less time to react to a failing set point controller and no obvious way of calculating the timing of a failure. Having looked hard at the stats, and compared my behavior on eCCR vs mCCR I don't even think one's greatest risk on an eCCR is controller failure though, but rather the propensity to become too lax and trusting that a "force beyond yourself" is going to catch you when you fall... to barrow a term, "function creep", is the siren call of eCCR's (the propensity to over rely on a device because of the ease of it's availability). If I were diving any CCR with my eyes closed, I'd be off the loop if I could not see my HUD or wrist unit, lickety split if the situation did not resolve by the time I ran out of gas then i'd go back on the loop and continue SCR. I have to say, diving in cold murky water, i've been in plenty of situations where I could not see two inches in front of me but i've never not been able to see my HUD and since it gives me real time po2 on all three cells, i'm able to continue flying it with a relative degree of confidence. that said, if my head was being held down in the mud, hands tied behind back, unable to push HUD against face plate or inject o2, or bail out ... I'd simply revert to the old "in case of nuke" drill: put head between legs, kiss ass good bye! ... on any rebreather. __________________ Gill Envy ...Because I wasn't born with gills! ><(°>><(°>><(°>><(°>><(°>><(°>><(°>><(°>
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