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--=====================_17411372==_.ALT Content-Type: text/plain; charset="us-ascii" At 03:00 PM 27/08/2001 , swanncruz@oc*.ne*.au* wrote: >Hi Billy, >I have been using the gradient factors on Decoplanner of 30% and 85%. >What are you guys doing, and a comment? for the 48 - 50 metre dives which we have had the most opportunity to play around with I just do a one minute stop every 10 metres to 21 metres, go to the 50 and spend three to five minutes there, and then a slow ascent to the surface. I've tried a whole lot of different things above 21 - ascending straight to 9 metres, doing 18, 15 and 12 meter stops, not doing them, swapping 6 and 3 metre stops, doing them all at 6 metres, and for me it doesn't seem to make a difference as long as the total dive time is the same or a few minutes less than a straight Buhlmann and there's a bit of a flare at the end. I take the learning to be - as long as you've got it right earlier on, the rest doesn't make much difference. Steve Bliim is using gradient factors so I guess he can tell you about those - I tried them a couple of times and wasn't happy. I didn't feel right afterwards so I went back to the lo-tek approach. Works for me. For the deeper dives I haven't had the opportunity to run a series but I'll send you what we've done. I haven't used gradient factors on the 65-78 metre ones but hand-shaped tables using the principles above work fine for me. You going to be in Sydney any time soon? rgds billyw >Jeff the Darwinian. >>----- Original Message ----- >>From: <mailto:billy@v3*.co*.au*>billy@v3.com.au >>To: <mailto:Jozef.Gliviak@co*.co*>Gliviak, Jozef >>Cc: <mailto:techdiver@aquanaut.com>techdiver@aquanaut.com >>Sent: Monday, August 27, 2001 9:39 AM >>Subject: Re: one deco gas - N50 or O2, when? >> >>At 01:04 AM 24/08/2001 , Gliviak, Jozef wrote: >>>Hello guys, >>> >>>Recently we had a disscussion with a few friends where some of them >>>advocated usage of N50 instead of O2 typically for dives like 55m/15min. My >>>opinion would be to choose O2 rather then N50. >>>Can you please answer me if there are a situations when it is more >>>appropriate to use just N50 instead of oxygen. Please add a few examples of >>>dives where would you choose O2 and where N50 as the only deco gas. >> >> >>Jozef - most of the wrecks aoound here are between 48 and 75 metres. >> >>A group of us have been diving these wrecks for years for bottom times >>between 18 and 25 minutes using bottom gas and 50. Early on we dived >>straight Buhlmann tables, then modified Buhlmann with deep stops, and now >>some are doing hand-shaped Buhlmann, and some, gradient factors. >> >>Over the years, we've increased the helium content in the bottom gas (and >>introduced it on the shallow wrecks) but the deco gas has remained the >>same - 50% - without incident. >> >>The only problems I've ever had have been last year on two successive >>dives trialling Gradient factor tables where I felt like shit after the >>dives, but that was probably the aggressive way I set the GFs not the gas. >> >>With a real slow ascent and a good soak at 21 metres, the 50 allows you >>to get most of your deco done by the time you get to the shallow stops. >> >>I've never noticed a detectable physiological difference adding 02 or >>substituting 02 for the 50%. >> >>rgds billyw >> >> >> >>>Best regards >>> >>>Jozef Gliviak >>>Slovakia >>> >>>----------------------------------- >>>The answer I received from George is too general for me to see where is the >>>effective border >>>Trey: >>>Depends on the bottom gas. Oxygen if the dive is shallow, 50% if it is >>>deeper . The idea is to get good deco at all the intermediate steps, >>>relieving the need for oxygen up high. Go by the bottom gas and the time. >>>Add gases as needed. >>>-- >>>Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. >>>Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. --=====================_17411372==_.ALT Content-Type: text/html; charset="us-ascii" <html> At 03:00 PM 27/08/2001 , swanncruz@oc*.ne*.au* wrote:<br> <font face="arial" size=2><blockquote type=cite cite>Hi Billy,</font><br> I have been using the gradient factors on Decoplanner of 30% and 85%.<br> What are you guys doing, and a comment?</blockquote><br> for the 48 - 50 metre dives which we have had the most opportunity to<br> play around with I just do a one minute stop every 10 metres to <br> 21 metres, go to the 50 and spend three to five minutes there, and <br> then a slow ascent to the surface. I've tried a whole lot of different <br> things above 21 - ascending straight to 9 metres, doing 18, 15 and 12 <br> meter stops, not doing them, swapping 6 and 3 metre stops, doing them <br> all at 6 metres, and for me it doesn't seem to make a difference as <br> long as the total dive time is the same or a few minutes less than a <br> straight Buhlmann and there's a bit of a flare at the end.<br> <br> I take the learning to be - as long as you've got it right earlier on,<br> the rest doesn't make much difference.<br> <br> Steve Bliim is using gradient factors so I guess he can tell you<br> about those - I tried them a couple of times and wasn't happy. I <br> didn't feel right afterwards so I went back to the lo-tek approach. <br> Works for me.<br> <br> For the deeper dives I haven't had the opportunity to run a series<br> but I'll send you what we've done. I haven't used gradient factors<br> on the 65-78 metre ones but hand-shaped tables using the principles<br> above work fine for me.<br> <br> You going to be in Sydney any time soon?<br> <br> rgds billyw<br> <br> <br> <br> <font face="arial" size=2><blockquote type=cite cite>Jeff the Darwinian.</font><br> <blockquote type=cite cite>----- Original Message ----- <br> <b>From:</b> <a href="mailto:billy@v3*.co*.au*">billy@v3.com.au</a> <br> <b>To:</b> <a href="mailto:Jozef.Gliviak@co*.co*">Gliviak, Jozef</a> <br> <b>Cc:</b> <a href="mailto:techdiver@aquanaut.com">techdiver@aquanaut.com</a> <br> <b>Sent:</b> Monday, August 27, 2001 9:39 AM<br> <b>Subject:</b> Re: one deco gas - N50 or O2, when?<br> <br> At 01:04 AM 24/08/2001 , Gliviak, Jozef wrote:<br> <blockquote type=cite cite>Hello guys,<br> <br> Recently we had a disscussion with a few friends where some of them<br> advocated usage of N50 instead of O2 typically for dives like 55m/15min. My<br> opinion would be to choose O2 rather then N50.<br> Can you please answer me if there are a situations when it is more<br> appropriate to use just N50 instead of oxygen. Please add a few examples of<br> dives where would you choose O2 and where N50 as the only deco gas.</blockquote><br> <br> Jozef - most of the wrecks aoound here are between 48 and 75 metres.<br> <br> A group of us have been diving these wrecks for years for bottom times<br> between 18 and 25 minutes using bottom gas and 50. Early on we dived<br> straight Buhlmann tables, then modified Buhlmann with deep stops, and now <br> some are doing hand-shaped Buhlmann, and some, gradient factors.<br> <br> Over the years, we've increased the helium content in the bottom gas (and<br> introduced it on the shallow wrecks) but the deco gas has remained the <br> same - 50% - without incident.<br> <br> The only problems I've ever had have been last year on two successive<br> dives trialling Gradient factor tables where I felt like shit after the <br> dives, but that was probably the aggressive way I set the GFs not the gas.<br> <br> With a real slow ascent and a good soak at 21 metres, the 50 allows you <br> to get most of your deco done by the time you get to the shallow stops.<br> <br> I've never noticed a detectable physiological difference adding 02 or <br> substituting 02 for the 50%. <br> <br> rgds billyw<br> <br> <br> <br> <blockquote type=cite cite>Best regards<br> <br> Jozef Gliviak<br> Slovakia<br> <br> -----------------------------------<br> The answer I received from George is too general for me to see where is the<br> effective border<br> Trey:<br> Depends on the bottom gas. Oxygen if the dive is shallow, 50% if it is<br> deeper . The idea is to get good deco at all the intermediate steps,<br> relieving the need for oxygen up high. Go by the bottom gas and the time.<br> Add gases as needed.<br> --<br> Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.<br> Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.</blockquote></blockquote></blockquote ></html> --=====================_17411372==_.ALT-- -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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