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Hi Billy,
I have been using the gradient factors on Decoplanner of 30% and 85%.
What are you guys doing, and a comment?
Jeff the Darwinian.
----- Original Message -----=20
From: billy@v3*.co*.au*=20
To: Gliviak, Jozef=20
Cc: techdiver@aquanaut.com=20
Sent: Monday, August 27, 2001 9:39 AM
Subject: Re: one deco gas - N50 or O2, when?
At 01:04 AM 24/08/2001 , Gliviak, Jozef wrote:
Hello guys,
Recently we had a disscussion with a few friends where some of them
advocated usage of N50 instead of O2 typically for dives like =
55m/15min. My
opinion would be to choose O2 rather then N50.
Can you please answer me if there are a situations when it is more
appropriate to use just N50 instead of oxygen. Please add a few =
examples of
dives where would you choose O2 and where N50 as the only deco gas.
Jozef - most of the wrecks aoound here are between 48 and 75 metres.
A group of us have been diving these wrecks for years for bottom times
between 18 and 25 minutes using bottom gas and 50. Early on we dived
straight Buhlmann tables, then modified Buhlmann with deep stops, and =
now=20
some are doing hand-shaped Buhlmann, and some, gradient factors.
Over the years, we've increased the helium content in the bottom gas =
(and
introduced it on the shallow wrecks) but the deco gas has remained the =
same - 50% - without incident.
The only problems I've ever had have been last year on two successive
dives trialling Gradient factor tables where I felt like shit after =
the=20
dives, but that was probably the aggressive way I set the GFs not the =
gas.
With a real slow ascent and a good soak at 21 metres, the 50 allows =
you=20
to get most of your deco done by the time you get to the shallow =
stops.
I've never noticed a detectable physiological difference adding 02 or=20
substituting 02 for the 50%.=20
rgds billyw
Best regards
Jozef Gliviak
Slovakia
-----------------------------------
The answer I received from George is too general for me to see where =
is the
effective border
Trey:
Depends on the bottom gas. Oxygen if the dive is shallow, 50% if it =
is
deeper . The idea is to get good deco at all the intermediate steps,
relieving the need for oxygen up high. Go by the bottom gas and the =
time.
Add gases as needed.
--
Send mail for the `techdiver' mailing list to =
`techdiver@aquanaut.com'.
Send subscribe/unsubscribe requests to =
`techdiver-request@aquanaut.com'.
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<DIV><FONT face=3DArial size=3D2>Hi Billy,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>I have been using the gradient factors =
on=20
Decoplanner of 30% and 85%.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>What are you guys doing, and a=20
comment?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Jeff the Darwinian.</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: =
0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A href=3D"mailto:billy@v3*.co*.au*" =
title=3Dbilly@v3*.co*.au*>billy@v3.com.au</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A=20
href=3D"mailto:Jozef.Gliviak@co*.co*" =
title=3DJozef.Gliviak@co*.co*>Gliviak,=20
Jozef</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Cc:</B> <A=20
href=3D"mailto:techdiver@aquanaut.com"=20
title=3Dtechdiver@aquanaut.com>techdiver@aquanaut.com</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Monday, August 27, 2001
=
9:39=20
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: one deco gas -
N50 =
or O2,=20
when?</DIV>
<DIV><BR></DIV>At 01:04 AM 24/08/2001 , Gliviak, Jozef wrote:<BR>
<BLOCKQUOTE cite type=3D"cite">Hello guys,<BR><BR>Recently we had
a=20
disscussion with a few friends where some of them<BR>advocated usage =
of N50=20
instead of O2 typically for dives like 55m/15min. My<BR>opinion =
would be to=20
choose O2 rather then N50.<BR>Can you please answer me if there are =
a=20
situations when it is more<BR>appropriate to use just N50 instead of =
oxygen.=20
Please add a few examples of<BR>dives where would you choose O2 and =
where=20
N50 as the only deco gas.</BLOCKQUOTE><BR><BR>Jozef - most
of =
the wrecks=20
aoound here are between 48 and 75 metres.<BR><BR>A group of us have =
been=20
diving these wrecks for years for bottom times<BR>between 18 and 25 =
minutes=20
using bottom gas and 50. Early on we dived<BR>straight Buhlmann =
tables, then=20
modified Buhlmann with deep stops, and now <BR>some are doing =
hand-shaped=20
Buhlmann, and some, gradient factors.<BR><BR>Over the years, we've =
increased=20
the helium content in the bottom gas (and<BR>introduced it on the =
shallow=20
wrecks) but the deco gas has remained the <BR>same - 50% - without=20
incident.<BR><BR>The only problems I've ever had have been last year =
on two=20
successive<BR>dives trialling Gradient factor tables where I felt like =
shit=20
after the <BR>dives, but that was probably the aggressive way I set =
the GFs=20
not the gas.<BR><BR>With a real slow ascent and a good soak at 21 =
metres, the=20
50 allows you <BR>to get most of your deco done by the time you get to =
the=20
shallow stops.<BR><BR>I've never noticed a detectable physiological =
difference=20
adding 02 or <BR>substituting 02 for the 50%. <BR><BR>rgds=20
billyw<BR><BR><BR><BR>
<BLOCKQUOTE cite type=3D"cite">Best regards<BR><BR>Jozef=20
=
Gliviak<BR>Slovakia<BR><BR>-----------------------------------<BR>Th
e =
answer=20
I received from George is too general for me to see where is=20
the<BR>effective border<BR>Trey:<BR>Depends on the bottom gas. =
Oxygen if the=20
dive is shallow, 50% if it is<BR>deeper . The idea is to get good =
deco at=20
all the intermediate steps,<BR>relieving the need for oxygen up =
high. Go by=20
the bottom gas and the time.<BR>Add gases as needed.<BR>--<BR>Send
=
mail for=20
the `techdiver' mailing list to `techdiver@aquanaut.com'.<BR>Send=20
subscribe/unsubscribe requests to=20
=
`techdiver-request@aquanaut.com'.</BLOCKQUOTE></BLOCKQUOTE></BODY></
HTML>=
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