Mailing List Archive Mailing List Archive
>On Wed, 31 Jul 1996, Richard Pyle <deepreef@bi*.bi*.Ha*.Or*> wrote: >> > >>> Offgassing is better, not worse. >> >>Is that conclusion based on just theory, or do you have something more >>substantial to go on? If the latter, I'd like to hear about it. Or, do >>you just mean it's better because you can start the O2 deeper? >> >>Rich >> George also wrote: > Rich, the pressure of air will be uniform around you while water depends on >what part of the body is at what depth, and the drysuit will act differently in >different spots in water but not in air. The body will not react to the feeling >of water and will therefor not try to shunt the blood away form the extremities >(we overcome that in water by swimming and being in top shape). The pressure at >you lips is the same as at your lungs, and is easier to ventilate properly, >etc, etc, etc. We could add that by staying deeper, it is easier to prevent bubble formation (you know, the reason for deep stops?;). Off gasing efficiency is constant regardless of the depth while breathing O2. So the deeper you can stay (limited by O2 toxicity), the better it is. The DCIEM recommend only their SurD O2 (table 3) table for extreme exposure dives. This involves decompression at a constant depth of 40 feet in a chamber, once a 30 feet stop is completed in-water. Their in-water O2 decompression table (table 2) involves decompression at a constant depth of 30 feet (with helmet). For most of us, they adapted table 2 so it involves O2 decompression at a depth of 20 feet (table 2m). I talked about that with Ron Nishi (DCIEM) a few years ago. He explained me that bubbles have less chances to form as you stay deeper. For myself, I always pull my 10 feet stop to 15-20 feet. Michel Therrien m.therrien@ne*.qc*.ca*
Navigate by Author:
[Previous]
[Next]
[Author Search Index]
Navigate by Subject:
[Previous]
[Next]
[Subject Search Index]
[Send Reply] [Send Message with New Topic]
[Search Selection] [Mailing List Home] [Home]