Mailing List Archive

Mailing List: cavers

Message Display

We've changed to EAN35 at 1.6 pp02 as our deepest
 Nitrox stops and are quit happy with the results.

Less narcosis makes for an even safer dive.

With all due respect,

Matt London

Thailand's deep cave exploration at - www.divefun.com/tcdp/


----- Original Message -----
From: Dan MacKay <dmackay@cg*.wa*.ca*>
To: <kirvine@sa*.ne*>
Cc: <cavers@cavers.com>
Sent: Wednesday, September 15, 1999 9:34 AM
Subject: Re: Decompression Question


> Hi all,
>
> I'd like to thank everyone who took the time to reply to my post. It was
most
> informative. I have always been of the opinion that when diving mix you
have to find
> the schedule that works best for you and the dive that you are doing. I
tried breaking
> on my back gas (16/50) during the deco 30 min bottom @ 210 and the
difference was
> amazing. No loggy feeling or low grade headache. I think that I will start
carrying a
> 120 mix and start using deeper stops. The deco so I will end up with a
32/50/100 as I
> was playing around with the tables and that combo seems pretty good.
>
> Thanks again.
> Dan
>
> kirvine@sa*.ne* wrote:
>
> > We break to the most hypoxic mix we can breathe all the way up at least
> > every twenty minutes, and in the oxygen phase we shorten that to as low
> > as 12 minutes with up to 8 minutes off. We do not interrupt the shcedule
> > for these "breaks". This routine spares the oxygen damage completely, as
> > measured by vital capacity tests that day and the next few days.
> >
> > Take a look back at what the usdct idiots did - they fried all of their
> > divers repeatedly due to ignorance of how to properly do this.
> >
> > The "clock" concept" is somewhat arbitrary and based on empirical
> > evidence - the breaks have extended the time to tox in tests. More
> > important, however, is the Navy experience which says that tox risks
> > comes in multiday exposures, so keep that in mind.
> >
> > Dan MacKay wrote:
> > >
> > > Hi George and to anyone who might have an answer,
> > >
> > > On my longer dive profiles which are typically 30 - 50 minutes @ 250',
I always
> > > use a 16/50 mix with 50% & 100% for deco. At the end of these dives
(or longer
> > > duration) I have blown my CNS clock away. For a 50 minute exposure I
have a total
> > > CNS clock of ~180%. This does not appear to cause me a problem as I
have been
> > > doing a couple of dives a week using profiles like this for a couple
of years now
> > > and this has not proved a problem. The only time I think that I ran
into this as
> > > a problem was about 4 years ago when I was diving a lot of deep air
with 36 and
> > > 80 for deco (ok it was before I saw the light) on the last two dives I
did in a
> > > two week period I couldn't breath by the time I hit my 20' stop.
Symptoms didn't
> > > abate till I was on the surface for about 15 min. In anycase I don't
do that now.
> > > I know this is small potatoes compared to what you and JJ do on a
normal WKPP
> > > dive. What do you do just ignore it? or what is your philosophy on
this?
> > >
> > > Thanks,
> > > Dan
>
>

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]