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Jim Cobb schrieb: > > 1) Smaller profile > a proper set of > doubles has less of a horizontal hight than a single any day of the week. Yep! > > 2) Reduced weight > > That's funny when I'm underwater (you do dive don't you?) I cannot seem to > tell the difference in weight. A standard 15l weighs 21 kg, a common 2X7 22 kg, so what the heck. > > 3) Decreased drag I do not think so . The further offset center of gravity nags. > > 5) Reduced space requirements > > So you have 2 tanks separate or together, don't understand your reasoning > here. They take up the same room Well some boats are prepared to host tanks of a special size... > > 6) KISS: Keep It Simple, Stupid > > My whole point with bagging the H or Y valve. Well 2 valves are two valves. > Good Lord I have not seen such frothing at the mouth since the last time I > said that pony bottles were crap. Pony bottles and H/Y valves are psudo-tech > bullshit and you bone-heads out there need to pull your heads out of your > asses and try a set of doubles, you bunch of fucking cheapskates. Well in France, Germany, as an Instructor I am required to use 2 indepentend regs, in France by law, in G by my associations standards, be it with doubles or singles. Reasons are twofold: Redundancy in case of freezing, and to prevent freezing. Redundancy in air supply for OOA situations. some combinations of first/second/backup stages work such that the "better" reg will suck the air from the "lower", forcing the divers to time their breathing on each other..., no good in a risky situation. > Doubles are redundant flasks of air connected by an isolator valve. Before I knew DIR I did not know of isolator valves. To me their only reason of existence , other from which can be achieved by independent valves, is to isolate the bottles in case of a 1.structural failure of the valve ( overhead impact when scootering ?) -- very unlikely in open ocean diving, or not scootering,not related to decompression overhead 2. O-Ring failure at bottles neck, again very unlikely, more unlikely even if considered to develop indive 3. manifold structural failure, see 1., manifold failures existed, more with flat face seals than with barrel type o-rings > H/Y valves and > Pony bottles are just you guys fighting with invisible demons. Preparing > most for the disasters that are least likely to happen. I think freezing and airsharing happens far more than the above mentioned failures, which are part of the reasoning ( except the normal advantages of doubles, which I think are self-understood) for doubles. Just my cc Matthias > Reg failures are exceeding rare. Needing more air than you've got all the > time. So what do you bozos do? Do nothing about your air supply and strap on > 2 regulators. That really makes sense. And then you defend this shit to the > death. > > There are always particular circumstances for this or that. Ice diving may > be one of them, I don't know as I've never done it. But the point is that > putting a H/Y valve or strapping a pony does not a techdiver make. > > Doubles are balanced, redundant, comfortable (both on the surface and in the > water) and anybody who says otherwise has not tried a set of properly setup > doubles. > > And for those of you who travel, simple, don't overhead dive. There is > nothing down there worth dieing for, why take the risk? > > Jim > > -- > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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