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Art, there is no good reason whatsovever to use a "travel down" mix with 17%/50% trimix on your back. It reaches a Po2 of .21 at 7.76 fsw. Breathing a higher oxygen mix does little to decrease inert gas absorpotion during the descent, so that argument becomes moot before we even start it. There are some who have claimed that they need the "travel down" gas to get to the anchor line and dont want to go hypoxic. First you can solve that problem with a properly set up boat so you dont do surface swims the the anchor line. For dives that would require a mix with less than 16% oxygen content setting up the boat is even more critical for the descent. Even a 12% oxygen content will reach a PO2 of .16 at 10 fsw. I'm 6'1" that means I only have to drop a little more than a body length down the anchor line to get the PO2 level up. There is no reason to use the Air Pony for descent. ... regards, jds At 10:14 AM 8/17/1999 -0400, Paltz, Art wrote: >Gotta jump in here. I have been following this thread with great interest >cause I know the people involved. I have not heard anyone who was there say >he was breathing the air tank as a travel mix. This is just another example >of people assuming and making statements to further the cause or just jump >in the band wagon. Is using air as a travel mix stupid when you've got a >17% back mix? Yes it is. Was it used, I think not! > >Art. > > > -----Original Message----- > From: Mike Rodriguez [mailto:mikey@ma*.co*] > Sent: Monday, August 16, 1999 11:39 PM > To: Joel Silverstein > Cc: techdiver@aquanaut.com > Subject: Re: Petting the Air Pony: was Re: Doria >Deaths - Let's dive some air > > At 07:50 PM 8/16/99 -0400, Joel Silverstein wrote: > > Hello Joel, > > >That's not it -- they just dont understand that its not >needed. They dont > >understand partial pressures, they dont understand that you >dont need a > >hypoxix mix for a 250 fsw dive, > > [SNIP] > > Am I missing something here? A normoxic mix at 250 fsw has >a > PO2 of 1.8 AtA. At 19.2% O2, the PO2 is 1.6 AtA and at >16.9% > it's 1.4 AtA. To dive safely at 250 fsw, a hypoxic mix at >no > more than 16.9% O2 should be used. > > Now, 16.9% O2 is perfectly breathable all the way from the >surface > to the bottom, of course, and reaches a normoxic PO2 just a >few > feet below the surface so a travel mix is not needed and >doesn't > makes sense on this dive, but the mix *does* have to be >hypoxic > to be safe. > > -Mike Rodriguez > <mikey@ma*.co*> > > -- > Send mail for the `techdiver' mailing list to >`techdiver@aquanaut.com'. > Send subscribe/unsubscribe requests to >`techdiver-request@aquanaut.com'. > -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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