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Hi Stuart >Deep stops are not for special occasions. Most tables work by bending you >then treating you on long shallow stops -- that is Haldanean decompression >theory!!! Deep stops are there to stop bubbles and microbubbles from >forming in the first place. Haldanean models seem to work not so bad, as virtually everybody still uses them with quite good safety results. >Take a look at VPM models where deco starts a lot deeper and is much >shorter than regular tables. I'm interested in that VPM model, where can I get more information? >No difference in fatigue? Try Pyle stops. I use Pyle stops everytime I do Tx dives. I've never done any Tx dive without them, so I actually can't tell the difference. But in the case of that famous 50M/20mn air profile, I don't feel much difference, specially if you use a somewhat conservative deco profile. >Helium is a far friendlier gas than nitrogen too. I'm not sure He is that much friendlier if you fail to empty your drysuit after a 54M dive, as it seems to happen. Probably the opposite as He comes out of solution faster than N2. >Such a lack of skill is a serious risk on any dive, regardless of gas mix. I'm the last one to argue that point. >Why? MOD for EAN50 is 22m, EAN80 is 9m. Why do you need such an added >range? What kind of profile are you diving that the contingencies are going >to push your first stop 13m deeper? I thought you didn't believe in deep >stops? Or is it so you can get in the water with no planning and do >whatever your computer says at the end of the dive? After the dive we're talking about, wouldn't a slow ascent with Nx50 since 20M be acceptably safe? >No. Sorry. Dive deep on air, because nitrogen is friendlier than helium, >ignore your dive plan in favour of your computer, don't do any deep stops >because they are unnecessary, deco on as low an O2 mix as possible because >you can't hold a 6m stop... I think I've missed your point completely. Was >there one? OK. Dive deep on air should stop as soon as you reach your limits, which can be 30M to 60M depending on your training, experience, personnal preference and sensitivity. Use deep stops whenever they become useful, but don't use heavy tools when unnecessary. And if you're not sure of your skills, get more training. But don't put yourself into risk if you don't know you can handle it. Am I clearer? Regards. Hugo. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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