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+/- 2 lb is still half to one-third of your tidal volume, a bit to much to control by breathing alone throughout the whole dive. Why pay constant attention and spend energy on fighting negative and then positive buoyancy? Why not weight corrrectly, compensate for gas weight with your bc, be perfectly neutral, relaxed and save energy for important stuff. I'm well aware of how it was done before, because I started my diving with double hose reg., no BC and had to use all kind of tricks to not either plow the bottom or float like a cork. BCs were invented to allewate these problems, so why not use them correctly? Maciej Pawlak > From: "Lee Bell" <leebell@ix*.ne*.co*> > Date: Mon, 7 Jan 2002 21:36:39 -0500 > To: "MPawlak" <pawlakm@ho*.co*>, <techdiver@aquanaut.com> > Subject: Re: neutral AL 80's > > You're assuming a wrong starting point and I think the change is about 5 lbs > from full to empty (check the Luxfer site if the difference is important to > you. I'm out of town and it's a hassel to browse from here.) Since the > tank never gets empty, it's probably closer to 4, but it dosn't make that > much difference. I don't start 4 lbs heavy. I never have to deal with the > whole 4 lbs, only half of it. At the beginning of the dive, I'm about 2 lbs > heavy, which helps my descent but is still within what I can control with > breathing patterns. At the end of the dive, I'm about 2 lbs light, not so > much I still can't control it with breathing patterns, but enough that if > something should happen, I would ascend gradually rather than sink. BTW, > I'm not inflating or deflating my lungs to a greater extent, only varying > the pattern of inflation and deflation. I'll bet you do the same thing for > minor changes in buoyancy, even if you don't know you are doing it. I can > do this with my PST HP 100s as well, but because they are about 1.5 lbs less > buoyant, it's not a natural thing to do, it's an effort. I usually start > the dive with just a bit of gas in the wing. > > Hopefully I mentioned that I do this in warm water and that, in warm water, > I don't use a wetsuit. When I add a wetsuit and the buoyancy shift it > causes as depth changes, I also add ditchable weight ( 4 lbs in Halcyon trim > weight pouches threaded on my waist strap) and usually add a bit of gas at > the beginning of the dive to offset the combined weight and compression. At > the end of the dive, in relatively shallow water, I'm pretty much back to > neutral. > > I know this sounds a bit odd in this day and time when the most common > arguments by rec divers is wings versus jackets, but this has been going on > a long time. How do you think we all managed in the days before BCDs were > common? 8^) If you still have doubts, I'd be more than happy to > demonstrate any time you are in S. Florida and the water is a bit warmer > than it is right now. > > Lee > > ----- Original Message ----- > From: "MPawlak" <pawlakm@ho*.co*> > To: "Lee Bell" <leebell@ix*.ne*.co*>; <techdiver@aquanaut.com> > Sent: Monday, January 07, 2002 12:26 AM > Subject: Re: neutral AL 80's > > >> Lee, >> You compensate for 6 or so lbs in buoyancy change by shifting your > breathing >> pattern???? That would require constant, close to 3 liters exhale at the > end >> of your dive ;-)) What is the tidal volume of your lungs - 15 liters?:-))) >> Maciej Pawlak >> >>> From: "Lee Bell" <leebell@ix*.ne*.co*> >> The >>> change in my buoyancy due to gas use is will within my ability to adjust > for >>> by changes in breathing patterns alone. >> >> -- >> 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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