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From: "Mcinnis, Don" <Don.Mcinnis@in*.co*>
To: "'HeliumDiver@ao*.co*'" <HeliumDiver@ao*.co*>, techdiver@aquanaut.com
Subject: RE: 80/20 deco
Date: Thu, 14 Sep 2000 15:42:05 -0500
Yeah, but if you're doing the dives that you need 100% O2 for deco, you
ought to be able to control your buoyancy a lot better than +/- 5'. If you
can't you have NO BUSINESS doing that kind of dive. This includes students,
if you don't have buoyancy control you need to work on BASIC skills before
working on doing deco dives requiring 100% O2.

Don

-----Original Message-----
From: HeliumDiver@ao*.co* [mailto:HeliumDiver@ao*.co*]
Sent: Wednesday, September 13, 2000 5:21 PM
To: techdiver@aquanaut.com
Subject: Re: 80/20 deco


In a message dated 9/13/2000 4:17:21 PM Eastern Daylight Time, 
swhac@pc*.gu*.ne* writes:

>      1.6 is 1.6 is 1.6 is 1.6 . . . 1.6!  These people that you speak of 
>  that have to use 50%, if they use it at 70 feet they are still facing the

>  same pO2 they would see if they were to use O2 at 20.

Things aren't that simple.  While the PO2 of 50% at 70 is 1.56, a change
in depth to 75 feet ups it to 1.64, a difference of only .08 and not a big
deal.  The same five foot change in depth on 100% at 20 feet takes
the PO2 from 1.61 to 1.76, a much more significant increase of 1.5.

A similar statement can be made for 80%.
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