FYI,
On New Jersey Dive boats, MANY of the divers use doubles, and do two seperate dives on the same cylinders. I thought it was strange as well, but even on their second dive, they start off with more air than I have in my al80.
FYI,
On New Jersey Dive boats, MANY of the divers use doubles, and do two seperate dives on the same cylinders. I thought it was strange as well, but even on their second dive, they start off with more air than I have in my al80.
I do that, but I think it's more out of laziness ... so I don't have to switch tanks between dives ...Originally Posted by acelockco
Even if I use my tank twice, I still have enough for my buddy, and more. So I'm fuming about the fact that someone is suggesting that I have to carry all that air to literally be an air-wetnurse for a bunch of potential idiots. In that line of logic: how long is my safety stop supposed to be exactly? 1hr until everyone is out of the water?
As for the doubles: how do you get out of the water with all that weight?!
Hmm, re-educate, or find a new dive team :-)
Getting out of the water for doubles? Ah, well that sort of divings not for women really, they're too weak and fragile... OK, that was in bad taste (sorry!).
It does take a bit more care, but not as hard as you might imagine. Plus, if you're air is as good as you say, then there's no need for you to double on 12 litre cylinders, take a couple of tens or eights instead.
My air management is ok so I haven't really thought about it until now. I average about 2/3 -1/2 an 80 for all of my dives so far. I haven't taken any of those clinics or courses but I'd like to.
Now I am confused?
It shoud be a rare time when you can reach your NDL on an AL80 and a non repetative dive. Is there something I am missing? Are you VERY VERY SMALL? Like 4'5" 70lbs?
What is your avg. dive depth and bottom time? I am just trying to figure this out.
I'd like to be closer to 70lbsThe closer you are to weighing 0lbs the better right? At least that's the impression I'm getting from the Victoria Secret Fashion Show
A sample dive would be: penetration would range from 90-70ft inside the wreck depending. So a 45/50-min dive (quick decent down the line and the requisite 3-min safety stop) I would be getting back on the boat with 2100-2250psi with a starting pressure of abt 3150psi. 2nd dive, same profile, same tank and surfaced just under 1000psi w/ a starting fill of 3150psi on an 80. Non-penetration, on the same wreck with quite a bit of swimming around, I would surface w/ abt 1600+, maybe more. I'm not quite sure b/c the non-penetration dives are done on a mixed boat and I'm always sharing my octo w/ someone. (Which is scary b/c they really suck the air back).
So if there's a lot of current or swimming I definitely would not do 2 dives on 1 tank.
Last edited by littleleemur; 12-17-2007 at 04:27 AM.
[QUOTE=bottlefish;8924]Hmm, re-educate, or find a new dive team :-)
Getting out of the water for doubles? Ah, well that sort of divings not for women really, they're too weak and fragile... OK, that was in bad taste (sorry!).
Whew! I don't trust myself to reply to this!
I always get a chuckle when I see guys show up on a strictly rec dive with doubles. I use them for tec dives but don't feel the need to try to impress the reccies when they are not necessary. I think it's a waste of energy. Gee, how hard is it to move a BC and reg?
I also have really good air consumption rates. It is rare to come up with less than 1400 lbs of air in my tanks. I try to arrange small tanks from the dive operation, if I can. Otherwise, I just bring back the air. I use it to practise many air rings during the safety stops. I feel secure that I would have plenty to spare, just in case.....
Last edited by allisonfinch; 12-26-2007 at 11:27 AM.
It is very easy to move a BC and reg, but to change over from a single cylinder to a double cylinder is a major change that usually requires tools and adaptors. Plus you will need an additional cylinder or a replacement valve and someone to inspect and fill your cylinder.
I wear my doubles mainly because I need the practice in them!!Shallow dive or not! Plus I don't have a single tank wing, but the smurf is going to hook me up there ...
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