85m air dive

[jtivat]

You use Nitrox backgas at 300 feet. Nice!!! That is not nearly enough gas for 30min bottom @ 300feet. Do you breath water? I see deco gas for 120, 70 and 20 feet. Looks more like a setup for 150 feet @30min BT.

I have dove these tanks many times to 275' and it is enough gas to dive 1/3's now I will say they are not filled to their rated pressure. They would be filled with 15/55 and the deco tanks would have some Trimix also.

But what I want to know is how to balance this rig so I would not need any redundant buoyancy? Was that not what you where going to show me???

 

[Blackwood]

But what I want to know is how to balance this rig so I would not need any redundant buoyancy? Was that not what you where going to show me???

.....

 

[jtivat]

Why would anyone take a 120 deco gas on a 150 foot dive?

Do you have any deco training? I'm starting to wonder.

Edit: I just ran the numbers on V planner. That is enough gas for a full 30 minutes at 300 feet. (SAC 0.6, 3600 psi in the 104s) No room for error/contingencies though so I wouldn't dive it.

They are 130's filled to 4000 psi so they have about 300 cu ft of gas in them. I use a sac of .5 and have about 1500 psi in them after a dive like this.

 

[Rainer]

Dorothy: "My goodness, he isn't even OW certified!"

 

[ianr33]

The 120 is most likely travel/bailout/backup gas,

Huh?

Whats a "backup' gas ? or a "bailout" gas / (Talking OC here)

 

[Cave Diver]

Dorothy: "My goodness, he isn't even OW certified!"

Maybe you were thinking about Hitler and AOW.

Damn! Godwins Law!

 

[Cave Diver]

Some interesting reading about balanced rigs for you kids playing along at home:

http://www.scubaboard.com/forums/dir/325263-balanced-rig.html

http://www.scubaboard.com/forums/ad...ons/286707-lets-talk-about-balanced-rigs.html

 

[ianr33]

You're the one who said you didn't need redundant buoyancy because wing failure was highly unlikely and besides you can swim twin AL80s up from 60 feet

To clarify:

I consider wing failure highly unlikely on an OW dive, so will dive twin 80s without redundant buoyancy. I can swim these tanks up.

In a cave using double 104's and stages I use a drysuit. Wing failure is more likely,especially in tight passages and there is no way I could swim those tanks up/out.

Clear?

 

[Cave Diver]

To clarify:

I consider wing failure highly unlikely on an OW dive, so will dive twin 80s without redundant buoyancy. I can swim these tanks up.

In a cave using double 104's and stages I use a drysuit. Wing failure is more likely,especially in tight passages and there is no way I could swim those tanks up/out.

Clear?

Pfffftt... You don't need redundant buoyancy. In a cave you could just walk/crawl out if you had a wing failure.

 

[ianr33]

Crawling 2000 feet through 10 foot deep silt is such an appealing prospect