Mailing List Archive

Mailing List: techdiver

Message Display

The logic? I was doing acid when I wrote this. No, actually, the logic
is just that you do not have enough time saved at each stop on a short
dive by using all the gases, and even if you did use them, you would
have to spend more time at the stops to get any real benefit, which
would then only shorten the upper stops, and you need to do the slow
ascent from 20 feet anyway, and I count that as part of the stop. With
shorter dives I do not even use oxygen, but my big concern is reducing
my vital capaciy for other sports which require giant heart rates and
fast breathing - not an issue for most people.

Said anohter way, Nick, if the bottom time is just a tad longer, the
level of gas absorbtion is so much higher that you really need to spend
the time deeper on the higer ppo2 gas to get a clean deco.

Why not just use a gas for each stop ( like a CCR )? You also need to
alternate back and forth between high and low ppo2's during deco, and
use the reduction in the pressure gradient as a key tool in forcing
offgassing. You also do not want to much vasoconstriction or lung
swelling , so the alternate ppo2's and the breaking to back gas (very
low ppo2 ) helps quite a bit.

Nick Tsikas wrote:
> 
> Hi captain G..
> 
> can you please explain the logic behing your following reply?
> 
> Take care,
> Nick
> 
> > The dive is kind of short to need all the gases. I'd add the 120 bottle
> > for 30 minutes, and the 190 thereafter.
> >
> >
> > Gagdive@ao*.co* wrote:
> > >
> > > George,
> > > Yesterday on this list, someone submitted a dive plan generated on
Smithers's
> > > software.  Some of it follows below:
> > >
> > > >
> > > > > 250 for 20, on 16/84 or what would you use for bottom gas?
> > > > >
> > > > > 50 and 100% deco gas, WKPP stops enabled, 1.7 max oc deco PP02.
> > >
> > > Does the fact that he's on Heliox nullify the need for the other two std
deco
> > > mix(s), the 120 bottle (35/ something TMX)  and perhaps the 190ish
bottle? I
> > > am unfamiliar w/ the Z- PLan stuff.


--
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]