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--_=_=_=IMA.BOUNDARY.HTML_4998384=_=_=_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Still bitter about the oxygen deco explanation John? I would have thought that such comments from a "kid" such as myself wouldn't have bothered you, as you are obviously so much older, wiser and more experienced than myself. (Which raises the question, why do you even bother to post here, if you already know everything?) Having said that, I have a question or two regarding your post, cited below. You mention that you are neutral at 20 fsw with 1500-2000 psi remaining in your tanks. I am curious then, what happens in the hypothetical situation that your tanks are near empty and you have had to jettison your deco bottle. Conventional wisdom would lead one to believe that you would have excess positive buoyancy in this case, but I'm sure you can set us all straight on that. Please explain. Second, you mention that you wear an 8 lb weight belt, which implies that you are using a high helium content in your back gas, since the minimum amount of droppable weight you require is the weight of the consumed gas in your tanks. Assuming you were breathing air, with twin Faber 85's and no overfill this would be at least 13.5 pounds, and then you need to add weight to that to compensate for exposure suit compression, since you are wearing a neoprene suit, and need to be able to get up when the suit compresses. Are you diving on heliox? An eight pound belt doesn't intuitively seem to balance such a rig, but once again I will defer to your greater knowledge and experience to explain how this is possible. As I think from your post, but am not sure (see above questions), you understand the concept behind a balanced rig, namely, that you have enough weight to hold your shallowest stop with near empty tanks, while being able to swim up your rig from depth with full tanks and compressed exposure suit, by dropping something (your belt). You use an aluminum deco bottle, so you obviously understand why deco and stage bottles should be able to be jettisoned without affecting your weighting. I hope to be able to learn about balancing my rig from your responses to these questions. As for the AL80 issue, in addition to proper balancing (as I understand it), the 80's provide superior streamlining in a format that is easily accomodated on most boats and easy to move around, given their light weight. -Sean T. "the kid" Stevenson PS - Just for the record, I never took such a brute force approach as to kick the slats out of my crib. According to my mother, I undid all of the fasteners (which were wingnuts), and the crib collapsed on me in the middle of the night - I took to sleeping in a bed at a very young age. Cheers. --Original Message Text--- From: Johnscha@ag*.co* Date: Wed, 5 Sep 2001 14:27:31 -0400 AL 80's Jeez, I really should lay off, but I just can't help myself. I think ya'll are smoking dope on mandating AL 80's as " the only way " to dive, open ocean, in a wet suit. I've been using Faber double 85's with a shortly, farmer john, vest, AL40 deco bottle and 8lb weight belt for a while. I am about neutral on my 20' hang with 1500 - 2000 psi remaining in the tanks and a near empty BC. I will kiss your collective butts at payday muster if I can't swim this rig off the bottom any day of the week while safely carrying more gas ! No comments from Sean and his legal beagle buddy please. I suspect I was doing this stuff when he was kicking the slats out of his crib. Probably like to tell me how to shoot an ILS to minimums. --_=_=_=IMA.BOUNDARY.HTML_4998384=_=_=_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: 7bit <HTML> <FONT FACE="MS Sans Serif" DEFAULT="FACE"><FONT SIZE="1" POINTSIZE="8" DEFAULT="SIZE">Still bitter about the oxygen deco explanation John? I would have thought that such comments from a "kid" such as myself wouldn't have bothered you, as you are obviously so much older, wiser and more experienced than myself. (Which raises the question, why do you even bother to post here, if you already know everything?)<BR> <BR> Having said that, I have a question or two regarding your post, cited below. You mention that you are neutral at 20 fsw with 1500-2000 psi remaining in your tanks. I am curious then, what happens in the hypothetical situation that your tanks are near empty and you have had to jettison your deco bottle. Conventional wisdom would lead one to believe that you would have excess positive buoyancy in this case, but I'm sure you can set us all straight on that. Please explain.<BR> <BR> Second, you mention that you wear an 8 lb weight belt, which implies that you are using a high helium content in your back gas, since the minimum amount of droppable weight you require is the weight of the consumed gas in your tanks. Assuming you were breathing air, with twin Faber 85's and no overfill this would be at least 13.5 pounds, and then you need to add weight to that to compensate for exposure suit compression, since you are wearing a neoprene suit, and need to be able to get up when the suit compresses. Are you diving on heliox? An eight pound belt doesn't intuitively seem to balance such a rig, but once again I will defer to your greater knowledge and experience to explain how this is possible.<BR> <BR> As I think from your post, but am not sure (see above questions), you understand the concept behind a balanced rig, namely, that you have enough weight to hold your shallowest stop with near empty tanks, while being able to swim up your rig from depth with full tanks and compressed exposure suit, by dropping something (your belt). You use an aluminum deco bottle, so you obviously understand why deco and stage bottles should be able to be jettisoned without affecting your weighting.<BR> <BR> I hope to be able to learn about balancing my rig from your responses to these questions. As for the AL80 issue, in addition to proper balancing (as I understand it), the 80's provide superior streamlining in a format that is easily accomodated on most boats and easy to move around, given their light weight.<BR> <BR> -Sean T. "the kid" Stevenson<BR> <BR> PS - Just for the record, I never took such a brute force approach as to kick the slats out of my crib. According to my mother, I undid all of the fasteners (which were wingnuts), and the crib collapsed on me in the middle of the night - I took to sleeping in a bed at a very young age.<BR> <BR> Cheers.<BR> <BR> <BR> --Original Message Text---<BR> <B>From:</B> Johnscha@ag*.co*<BR> <B>Date:</B> Wed, 5 Sep 2001 14:27:31 -0400<BR> <BR> AL 80's <BR> <BR> <BR> <FONT FACE="Arial"><FONT SIZE="2" POINTSIZE="10">Jeez, I really should lay off, but I just can't help myself. I think ya'll are smoking dope on mandating AL 80's as " the only way " to dive, open ocean, in a wet suit. I've been using Faber double 85's with a shortly, farmer john, vest, AL40 deco bottle and<B> 8lb weight belt</B> for a while. I am about neutral on my 20' hang with 1500 - 2000 psi remaining in the tanks and a near empty BC. I will kiss your collective butts at payday muster if I can't swim this rig off the bottom any day of the week while safely carrying more gas ! No comments from Sean and his legal beagle buddy please. I suspect I was doing this stuff when he was kicking the slats out of his crib. Probably like to tell me how to shoot an ILS to minimums. <FONT FACE="MS Sans Serif" DEFAULT="FACE"><FONT SIZE="1" POINTSIZE="8" DEFAULT="SIZE"> <BR> <BR> </HTML> --_=_=_=IMA.BOUNDARY.HTML_4998384=_=_=_-- -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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