Mailing List Archive Mailing List Archive
This is a multi-part message in MIME format.
------=_NextPart_000_005B_01BFC8B9.A2775DE0
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
You are correct Simon, It's all in the experience. All you have to do is =
understand what the curve (s) look like and use standard gases. =
Adjusting the entire curve + or - is all that is done in most deco =
software. Knowing where you are on the curve for ongasing and relating =
that to the off gassing curve is actually easy. Now, that being said, =
there are some who have to adopt a different shape to the curve (slower) =
due there own inherent ability to get bent, regardless of physical =
condition or other circumstances.=20
If you get enough dives in and cut enough deco you begin to FEEL the =
deco and it becomes natural. In a corny metaphor it would be the =
difference between knowing what the matrix is and being able to =
manipulate the matrix.=20
OK, that was stupid, but for your average dive of less than 300 ft =
depth and less than an hour on the bottom, it becomes easy to adjust on =
the fly.
That doesn't mean you don't run the risk of getting bent-you are =
just in your own comfort zone of risk. I've done shitty deco and felt =
it, but the right deco feels good.
I'm not saying I have it figured out-but I know what it should feel =
like. And of course when teaching you still must follow the standards. =
For my own diving and my close friends, we cut it to fit what we like, =
and I'll tell the same story to anyone who asks-EZ
p.s. I have never been in a chamber, I feel empathy for those that =
have
p.p.s We have a saying; "There ain't nothing a few minutes on O2 =
cain't fix"
----- Original Message -----=20
From: Simon Murray=20
To: Tech Diver=20
Sent: Sunday, May 28, 2000 9:59 AM
Subject: Deco in my head
From the volume of posts this weekend, it seems like nobody is in the =
water ;-)
=20
I recall first reading that Trey calculates his deco in his head and =
thinking that this must be bull because my instroketor had us running =
profile after profile on Abyss when the mix came +0.1% o2 or when =
somebody realised that they had been diving for 10 instead of 8 years =
and so they needed to adjust their Abyss "j" factor.
=20
This morning, the cave dive turned out to have worse viz and the =
tunnel a lot shorter than I had thought, so the bottom time was half =
what I planned (using Decoplanner). What to do ? Make up a new deco =
schedule on-the-fly using the old one as a starting point. =20
=20
My point, by listening to the people who actually dive instead of =
those who read it in an agency manual, you can learn to do it properly.
=20
Out of interest, I just re-ran the profile and it was almost spot on.
=20
Simon Murray,
South Africa
------=_NextPart_000_005B_01BFC8B9.A2775DE0
Content-Type: text/html;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META content=3D"MSHTML 5.00.2314.1000" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT size=3D2>You are correct Simon, It's all in the experience. =
All you=20
have to do is understand what the curve (s) look like and use standard =
gases.=20
Adjusting the entire curve + or - is all that is done in most deco =
software.=20
Knowing where you are on the curve for ongasing and relating that to the =
off=20
gassing curve is actually easy. Now, that being said, there are some who =
have to=20
adopt a different shape to the curve (slower) due there own inherent =
ability to=20
get bent, regardless of physical condition or other circumstances. =
</FONT></DIV>
<DIV><FONT size=3D2> If you get enough dives in and =
cut enough=20
deco you begin to FEEL the deco and it becomes natural. In a corny =
metaphor it=20
would be the difference between knowing what the matrix is and being =
able to=20
manipulate the matrix. </FONT></DIV>
<DIV><FONT size=3D2> OK, that was stupid, but for your =
average=20
dive of less than 300 ft depth and less than an hour on the bottom, it =
becomes=20
easy to adjust on the fly.</FONT></DIV>
<DIV><FONT size=3D2> That doesn't mean you don't run =
the risk of=20
getting bent-you are just in your own comfort zone of risk. I've done =
shitty=20
deco and felt it, but the right deco feels good.</FONT></DIV>
<DIV><FONT size=3D2> I'm not saying I have it figured =
out-but I=20
know what it should feel like. And of course when teaching you still =
must follow=20
the standards. For my own diving and my close friends, we cut it to fit =
what we=20
like, and I'll tell the same story to anyone who asks-EZ</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2> p.s. I have never been in a =
chamber, I feel=20
empathy for those that have</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2> p.p.s We have a saying; =
"There ain't=20
nothing a few minutes on O2 cain't fix"</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:simonm@ho*.co*.za*"=20
title=3Dsimonm@ho*.co*.za*>Simon Murray</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A=20
href=3D"mailto:techdiver@aquanaut.com" =
title=3Dtechdiver@aquanaut.com>Tech=20
Diver</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Sunday, May 28, 2000
9:59 =
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Deco in my
head</DIV>
<DIV><BR></DIV>
<DIV><FONT face=3D"Times New Roman">From the volume of posts this =
weekend, it=20
seems like nobody is in the water ;-)</FONT></DIV>
<DIV><FONT face=3D"Times New Roman"></FONT> </DIV>
<DIV><FONT face=3D"Times New Roman">I recall first reading that =
Trey=20
calculates his deco in his head and thinking that this must be =
bull=20
because my instroketor had us running profile after profile on Abyss =
when the=20
mix came +0.1% o2 or when somebody realised that they had been =
diving for=20
10 instead of 8 years and so they needed to adjust their Abyss "j"=20
factor.</FONT></DIV>
<DIV><FONT face=3D"Times New Roman"></FONT> </DIV>
<DIV><FONT face=3D"Times New Roman">This morning, the cave dive turned =
out to=20
have worse viz and the tunnel a lot shorter than I had thought, so the =
bottom=20
time was half what I planned (using Decoplanner). What to do =
? =20
Make up a new deco schedule on-the-fly using the old one as a starting =
point. </FONT></DIV>
<DIV><FONT face=3D"Times New Roman"></FONT> </DIV>
<DIV><FONT face=3D"Times New Roman">My point, by listening to the =
people who=20
actually dive instead of those who read it in an agency =
manual, you=20
can learn to do it properly.</FONT></DIV>
<DIV><FONT face=3D"Times New Roman"></FONT> </DIV>
<DIV><FONT face=3D"Times New Roman">Out of interest, I just re-ran the =
profile and it was almost spot on.</FONT></DIV>
<DIV><FONT face=3D"Times New Roman"></FONT> </DIV>
<DIV><FONT face=3D"Times New Roman">Simon Murray,</FONT></DIV>
<DIV><FONT face=3D"Times New Roman">South=20
Africa</FONT></DIV></BLOCKQUOTE></BODY></HTML>
------=_NextPart_000_005B_01BFC8B9.A2775DE0--
--
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]