How many hours from a Prism with 19 cft tanks?

Decodiver

warjarrett,

Please heed the well spoken advice of the previous people on this thread and take a bailout bottle, I can think of at least 3 situations when I would be DEAD if I had not carried adequate bailout.

It is a common feeling amongst ab-initio rebreather users, that bailout cylinders are cumbersome, and that the onboard diluent is sufficient to bailout, from recreational depths.

Well IMHO, both of these are wrong, choose aluminium or carbon-fibre bailouts and you cannot even notice them in the water, especially if you use a Golem Gear Armadillo CCR butt plate, and your diluent is not gonna keep you more than a couple of breaths from death.

Cheers,

Dave Cooper.

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caveseeker7

Dave, for some odd reason PRISM training (at least in the US) is done without offboard bailout.
So at least during training dives warjarrett will be without it.
No, don't know why, yes, agree it's dumb.

Jarrett, first thing to change after class: Get a bailout tank and reg and learn how to use it.

Safe diving.

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Cheers
Stefan



"It is still a good day if you are on the green side of the grass!

Su amigo Roberto!"

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robinfante

That definitely was not my experience. With Ron Scorese we had bailout with us on every single dive, including in the pool, and practiced going off the loop ad nauseum.

Re duration, in that range I'll usually get three long dives in. Experience will teach you how much you use, and will also probably reduce your diluent use - I used to use equal parts diluent/O2, now I still have 2000 psi after three long dives.

BTW, long dives to 100' with no bailout? Spoken only with respect and concern, are you out of your ****ing mind? These units (all of them) are the farthest thing from infallible.

Please, please take bailout. I'm willing to bet that anyone you talk to with a few hundred hours has gotten off the loop at least once. Shit happens, you've got to have plan B (not to mention C, D, and maybe E.)

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Tecdiverfl

I am curious what your instructors position is on not diving with a bail-out bottle? If he tells you it not a problem you may want to look for another instructor.

Just remeber what can go wrong will go wrong

Just my own 2 cents

caveseeker7

Relax, dude, he's still in his class and asking questions.
Am pretty sure he got the point before you started to insult him.

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Cheers
Stefan



"It is still a good day if you are on the green side of the grass!

Su amigo Roberto!"

Sponsor Lou in Race For Life!

gkndivebum

As many have mentioned, gas consumption is largely dependent on profile,
setpoint and one's own metabolism. Scrubber duration is also a function of
temperature and workload.

For some data points, diving here in Hawaii on a typical shallower-than-130
reef dive for 75-90 minutes I'll use anywhere from 400-600 PSI of O2 and
300-500 PSI of diluent. Water temperatures here range from 75F in the
dead of winter to 81F in late September/early October. I generally get
10 hours of duration using 6-12 Sodasorb under these conditions.

Initially my diulent use was a bit higher until I got into the "zen" of
diving the rig and proper counterlung volume management. 99% of my
diving is using 1.2 for a setpoint; rarely I'll use 1.4 or for an
extremely shallow dive 0.7.

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gkn
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dive2dive2000

Hi Stefan,

I took my class with Ron Scorese, and that was definitely NOT the case. we did not even go in the pool without bailout. This philosophy is advocated from Peter and the Naui Tec guys. I am almost positive, but cant be sure that it is also advocated by Jeff Bosanic, and Terry Tyler.

These names alone span across the East cost the South and Mid west as well as your old stopping grounds The West Coast. Maybe when you were certified that was the case but it has certainly changed.

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Safe Diving,
Martin

"but what's the fun of getting what you need, instead of what you want?"

dan@scuba-training.net

I have stumbled upon the same rule of thumb:

When your diluent consumption matches your oxygen consumption, you are ready to dive, grasshopper.

Steve

I can't help but thinking that supplied harness may have a lot to do with this. I't is sadly lacking D Rings in useful spots.

PS. take bailout. :-)

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silent running

Yes Steve, it's true, one needs a fair amount of ingenuity to make carrying even a 30 comfortable, but it can be done. While I found the harness very comfortable, initially, I thought it could use an under CL d-ring to make BO cyls sit more parallel to the body. But then you run into problems with how to stitch it to the underside of the lung without having to put some sort of hard backing there and it wouldn't be very adjustable and less comfortable. If you decide to go with a web harnes under the CLs, you loose the very easy don/doff that the standard harness CL fastex clips provide-just slide in from underneathe. And I for one, don't dig having to push the whole loop back over my head and then have the DSV come crashing down on my nose if I can't manage to do the chicken wing into a DIR web harness fast enough...

After trying 3 different setups, I prefer the standard idea of allowing the CLs to remain weight baring and retain the easy on/off fastex buckles and loops to attach the lungs to a waist web belt, which means side mount BO. My upper CL velcro tabs are now permanently sewn to the top slots of a Deep Sea Supply plastic harness plate, with a web waist belt to attach the other end of the CL fastex loop rig.

As for the training standards of the past, I don't think they had anything to do with how the harness is designed, remember that the Prism course was written a very long time ago. But I agree that having a stock setup with a system for side mounting BO would make the Prism an even better package. -Andy