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<html> James,<br> <br> That depends a lot on the workload and your personal physiology. ..16 ata is considered the minimum for rest. If you are under sever exertion .21 ata is low enough. If you your ancestors come from the mountains of Tibet .10 might be enough. I have started dives with low O2 %s without a travel mix by taking a breath (of air) at the surface and putting the reg in my mouth. By the time I take a breath at 5-10 feet the PPO2 is high enough to breath without a problem. You won't black-out from one or two breaths of 14% O2 at the surface but you might get a little light headed. <br> <br> I recommend you find a GOOD instructor for mix but you can find a lot of information on Jim's web site that will help you determine if your instructor is worth the money you are paying him and give you some background before you get into a class.<br> <br> <br> <br> At 11:43 PM 23-07-00 , James Dibbs wrote:<br> <br> <font size=2><blockquote type=cite cite>"PPO2s of 1.3ata are high enough for a bottom mix and less is better still (within reason)."</font> <br> <br> <font size=2>Curious about this as I want to start using trimix. What is the minimum pp02 for a working dive that will keep you conscious?<br> </font><br> James Dibbs <br> <font size=2>Sydney, Australia</font> <br> <br> <font size=2>-----Original Message-----</font> <br> <font size=2>From: Jim Cobb [<a href="mailto:cobber@ci*.co*">mailto:cobber@cisatlantic.com</a>]</font> <br> <font size=2>Sent: 24 July 2000 7:12 AM</font> <br> <font size=2>To: Bill Bott; Shimell, David (shimell); Manos Manoli; Tech Diver</font> <br> <font size=2>Subject: Re: Table Vs Abyss</font> <br> <br> <font size=2>Bott, you boob, I agree with you 100% on this. I feel better after the dive</font> <br> <font size=2>if I keep my PPO2 bottom mix 1.2 max.</font> <br> <br> <font size=2>That ANDI calls nitrox "safeair" is too funny. I know, lets add cyanide to</font> <br> <font size=2>whiskey and call it "safebooze".</font> <br> <br> <font size=2> Jim</font> <br> <font size=2> ------------------------------------------------------------------- </font> <br> <font size=2> Learn About Trimix at <a href="http://www.cisatlantic.com/trimix/">http://www.cisatlantic.com/trimix/< /a></font> <br> <br> <font size=2>> From: Bill Bott <aquadart@ix*.ne*.co*></font> <br> <font size=2>> Date: Fri, 21 Jul 2000 17:00:44 -0400</font> <br> <font size=2>> To: "Shimell, David (shimell)" <shimell@se*.co*>, Manos Manoli</font> <br> <font size=2>> <manos@ma*.co*.cy*>, Tech Diver <techdiver@aquanaut.com></font> <br> <font size=2>> Subject: RE: Table Vs Abyss</font> <br> <font size=2>> </font><br> > For about the last 4 years now I have been using 21/25 (O2/He) as bottom <br> <font size=2>> mix for dives from 130' (40 mtrs) down to 170' -180' (52 -55 mtrs). The</font> <br> <font size=2>> Idea of using such a high O2 is a through back to the old school of nitrox</font> <br> <font size=2>> where we were taught a 1.5ata PPO2 for a bottom mix. I think (I hope)by</font> <br> <font size=2>> now we know that is a bad idea even in the best of conditions. Most of the</font> <br> <font size=2>> people I know now are recommending 1.4ata or less, depending on who you</font> <br> <font size=2>> talk to. I am in the "or less" camp!!! PPO2s of 1.3ata are high enough</font> <br> <font size=2>> for a bottom mix and less is better still (within reason).</font> <br> <br> <font size=2>--</font> <br> <font size=2>Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.</font> <br> <font size=2>Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.</font> </blockquote><br> Bill (aquadart) Bott </html> -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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