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This is a multi-part message in MIME format. --------------74DC74551A27 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit This thread started on "Scuba-l" for the sake of discussion, I thought I'd bring it over here too... Don't ask me how "gear for sale" mutated into a Nitrox thread. It wasn't my idea. DM --------------74DC74551A27 Content-Type: message/rfc822 Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-ID: <3360724A.48D3@cy*.ne*> Date: Fri, 25 Apr 1997 03:58:50 -0500 From: "Drew M. Mooney" <dmooney@cy*.ne*> Reply-To: dmooney@cy*.ne* Organization: FSI, Inc. X-Mailer: Mozilla 3.01Gold (Win95; I) MIME-Version: 1.0 To: Scuba diving discussion list <SCUBA-L@BR*.BR*.ED*> Subject: Re: Why Nitrox? (Was: gear for sale) References: <199704250736.JAA01432@s8*.cc*.kb*.be*> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Xavier Merlin wrote: > <snipped> > I use a pony bottle with air ,so in > case i have to descend beyond my MaximumOperationDepth (MOD) , which > is enforced by the type of mixture you use, for an emergency i can do > so without endangering myself. > Xavier, For discussion purposes only: I like the idea of carrying air to accomodate the possibility of having to exceed the MOD of your backgas. Would switching to it entail risk of the not-much-talked-about "slam" - or is that more of an issue with trimix? Suppose you're at 130fsw on Nx32 - your EAD is 110' - shallower than what most would consider Narcosis territory - (assuming warm, clear conditions, etc.) Then, for whatever reason - caught in a "downdraft", loss of depth control, or need to assist a diver who's a bit below your MOD limit, you switch to your trusty 30cf. pony full of air as you descend. In the blink of an eye (well, in a single breath actually) you've "descended" 20'-30'. Add to that the fact that if you've had to switch, something is awrye. (Perhaps there's a bit of stress going on.) Granted - I'd much sooner risk taking a narcosis slap in the face than to start doing the OxTox shuffle... I imagine the nitrogen spikes I've read about occur under more drastic conditions than this - as in switching from trimix to air, but since trimix is outside the realm of this discussion, and the experience of most members of this list (self included) suppose we limit the discussion to an at depth switch from Nx to Air. Have you tried it? And if you have, do you think the fact that it was a controlled experiment vice one of those seat of the pants situations may have influenced the results? Cheers, Drew --------------74DC74551A27-- -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send list subscription requests to `techdiver-request@aquanaut.com'.
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