Mailing List Archive Mailing List Archive
The best source is the vpm yahoo news group and the freeware program "vplanner" which you can get there. Also, there is a VPM website with all the theory, etc: http://www.decompression.org/maiken/VPM/VPM_Program_Site_Map.htm Wendell --- Isaac Callicrate <icallicrate@ho*.co*> schrieb: > Thanks for posting publicly. I have heard some good > private posts that > should have made it on this list. I have been in > love with the VPM since I > read on it. I dont think I have seen anything in the > last five years about > it so if you have any good references I would be > very thankful. > > > >From: wgrogan@dc*.ne* > >Reply-To: wgrogan@dc*.ne* > >To: icallicrate@ho*.co*, techdiver@aquanaut.com > >Subject: RE: Dr Black/ChamberHaters > >Date: Wed, 12 Dec 2001 09:56:08 est > > > >Just to add a couple of things. > >The Navy tables are not useful for tech diving. > The first thing the Navy > >manual > >says is that mixed gas diving should not be done > unless there is a chamber > >on > >board the ship. In fact, the schedules assume that > you will deco to 40 > >feet, > >then get lifted up to the ship, stripped of your > gear and put in a chamber > >and > >recompressed within 5 minutes. This is important > for military dive > >operations > >and is a hold over from caisson decompression where > you had to move shifts > >of > >workers in and out of pressure every few hours. It > was much more efficient > >to pull an elevator load up to the surface, rush > them into a surface > >chamber > >as a group and decompress them that way. (We're > talking late 18th early > >19th > >century technology here). What is pretty clear > from both Navy tables and > >straight > >Buhlmann calculations is that you are > overpressuring the tissues, > >essentially > >causing sub clinical bends if you will, then > "treating" with longer stays > >at > >shallower depths with higher O2 percentages. The > first attempt to address > >this > >was Pyle's "deep stop" method. He is the first to > tell you that this was > >just > >a rough guess, not based on any kind of science. > Scientific work has been > >done > >by Baker and others, and the results are the so > called Gradient Factors > >which > >modify Buhlmann calculations to address the > overpressure problem when > >ascending > >from depth. There is also a fairly radical > re-think called Variable > >Perfusion > >Modelling which is the first complete change in > deco theory in half a > >century. > > > >Johnny is right about TDI. I just read their > trimix manual last week and > >in > >it they basically say, get a good deco program, > forget tables. > >The downside to using a computer program is not > understanding what the > >theory > >is behind the program. You need to understand what > the computer is doing, > >and > >if and how you need to modify it for your fitness, > experience, dive > >conditions, > >etc. What the WKPP guys do is based on the fact > that they self select > >people > >that are capable of doing extreme dives and deco. > Thats not to say that > >with > >enough work and self discipline you can't do the > same, but you can't just > >wander > >into the water after sitting behind a desk all > week. > > > >Wendell > > > > >Hi Isaac > > > > > >3 years back I used to do dives that required > 1-1½ hr on 80%. > > >On a couple of ocations I stayed 2½ hrs on 80% > just to see when any > > >pulmonary symptoms would begin. No gas breaks > done. In these exposures > >there > > > > >was really no significant symptoms. > > > > > >When I do pure O2 now, I get the symptoms after > 30-40min. There I'm doing > >15 > > > > >/ 3 gasbreaks (but using the 50% decogas to > "break" on) > > > > > >From my chamber experience and talking to > comercial divers, the > >inhalation > > > > >resistance on the O2 reg or mask, has a major > influence on how your lungs > > > > >are going to feel afterwards. > > > > > >BTW, no agency is using Navy tabels anymore. I > think even TDI stopped 2 > >or > >3 > > >years ago. > > > > > >Regards > > > > > >Johnny Christensen > > > > > > > > >>From: "Isaac Callicrate" > <icallicrate@ho*.co*> > > >>To: trey@ne*.co*, techdiver@aquanaut.com > > >>Subject: RE: Dr Black/ChamberHaters > > >>Date: Tue, 11 Dec 2001 12:48:16 -0500 > > > > > >-snip- > > > > > >>>Im interested to hear if any of the IANTD's on > the list have done a > > >>long > > >>enough exposure to see pulmonary issues on > 80/20? I hope Im not the only > > > > >>one > > >>getting something out of this. (Everyone take a > turn squeezing more out > >of > > > > >>Trey while he is feeling generous) > > >>Thanks > > > > > > > > > >_________________________________________________________________ > > >Chat with friends online, try MSN Messenger: > http://messenger.msn.com > > > > > >-- > > >Send mail for the `techdiver' mailing list to > `techdiver@aquanaut.com'. > > >Send subscribe/unsubscribe requests to > `techdiver-request@aquanaut.com'. > > > > > > > > > _________________________________________________________________ > Get your FREE download of MSN Explorer at > http://explorer.msn.com/intl.asp. > > > > __________________________________________________________________ Gesendet von Yahoo! Mail - http://mail.yahoo.de Ihre E-Mail noch individueller? - http://domains.yahoo.de -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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]