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> > the CCR being much more complex, dangerous and expensive. You can have > > 75% of the rebreather benefit with the SCCR, eeeeerrrrrreeeeennnnnnnnnnnttttttttt !!! sorry but i'd have to disagree a little, i think rich's numbers are closer. i also think that semi closed units are mainly gonna dissapoint divers, most of what they will do for you is make you cirtian that you want a fully closed unit. > > I agree for the most part, but I would drop the "75%" to maybe "40%", and > I would reduce the "tenfold" to maybe "threefold". I would also not have > used "more dangerous" as a way to deliniate CCR from SCCR. Most of the > "danger" comes from poor design (for both kinds of 'breathers) and > misuse. CCR systems in general are "more dangerous" **ONLY** in the wrong > hands. In the right hands (well-trained hands), SCCR systems (in > general) are probably more dangerous because without sensors, you DO NOT > KNOW the PO2. exactly, and when everyone finds out this truth, for real (the first time you dive with out sensors), no one will accept units without indicators. i would sorta compare it to being at 200fsw on open circuit without a pressure guage.. try it, see how good it feels. That doesn't change no matter how well-trained you are. > right again, manufactureres putting units on the market should to be used without o2 indicators should name their units something like ouij. (the game where you put your fingers on the little dofigie and it moves by it's self and points to letters, you'll have about the same chance of knowing where you are(. dp
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