TDI Advaced Nitrox and Deco Procedures

[Scuba_Steve]

Not sure why you'd need any better buoyancy control than doing a 100 foot (or so) dive on 32% really. You dont want to do a fast ascent in either case.

Cause that's what knuckle heads keep telling him, so it must be true.

What do they call that?......a mountain of bovine scatology

Could be wrong of course, but the fix for poor buoyancy control probably isn't to take the Helium out of your mix.

 

[PerroneFord]

Not sure why you'd need any better buoyancy control than doing a 100 foot (or so) dive on 32% really. You dont want to do a fast ascent in either case.

If you can hit 1 min stops at 50,40,30,20,10 feet then shouldn't be an issue.
Of course, there are other issues planning significant dives at that depth (gas planning, handling emergencies, teamwork etc.) which are critically important.

It's mistakes and experience I'm worried about. Yes I can hit the stops. As long as everything stays on track. It's when the crap hits the fan, that I am worried about hitting my stops. Blowing my stop(s) on EAN32 worries me a LOT less than blowing them on Trimix.. even though I am still talking about NDL diving.

 

[limeyx]

It's mistakes and experience I'm worried about. Yes I can hit the stops. As long as everything stays on track. It's when the crap hits the fan, that I am worried about hitting my stops. Blowing my stop(s) on EAN32 worries me a LOT less than blowing them on Trimix.. even though I am still talking about NDL diving.

I'd be interested to see some comparative data on this issue, although I am not aware of any that exists for those relatively shallow depths.

I guess there are still a lot of unknowns, but my understanding is that He dissolves and comes out faster, but is less soluble, so there's less of it to come out. And blowing the stops from 100 feet is not good with either gas.

Is there some reference you use when you determine that the 30/30 would be more dangerous? Or just a lack of information on He? (THis is an honest question, and not an attempt to deride anyone for their views).

 

[PerroneFord]

Because of Helium's smaller bubble size, and it's propensity to offgas faster, I am VERY concerned that it might well pass to the arterial side of the vascular system and cause me issues. Until I feel SOLID in the water, even under adverse conditions, I will avoid helium. I think that is the prudent course of action.

Others may feel differently, and take a different path. I wish them well. I am not saying my way is right, or even right for someone else.

 

[H2Andy]

What do they call that?......a mountain of bovine scatology

generally speaking, the mountains of bovine scatology increase both in mass and
volume with such accelerated vectors in Scuba that one needs aerodinamically
efficient frontal appendages to remain at a level equal to or above that of
said mountains.

 

[limeyx]

Because of Helium's smaller bubble size, and it's propensity to offgas faster, I am VERY concerned that it might well pass to the arterial side of the vascular system and cause me issues. Until I feel SOLID in the water, even under adverse conditions, I will avoid helium. I think that is the prudent course of action.

Others may feel differently, and take a different path. I wish them well. I am not saying my way is right, or even right for someone else.

So basically based on the theory of what "should" happen then.

Nothing wrong with that, but if there's real data, I'd love to see it too.

I'd say it's definitely good to recognize your limits and stay within them.

 

[Scuba_Steve]

generally speaking, the mountains of bovine scatology increase both in mass and
volume with such accelerated vectors in Scuba that one needs aerodinamically
efficient frontal appendages to remain at a level equal to or above that of
said mountains.

So we're all going to crash and burn eventually? lol with a little poop on our nose for good measure.....

 

[PerroneFord]

There have been any number of researchers out there fooling with this stuff for years. I've talked to a couple, read work by others. I'd call it more than a theory. I had some VERY interesting conversations with a gentleman who works at NEDU. On our first conversation, I asked what he did at NEDU, he said, "I bend divers". Got my attention very quickly. Talking to someone who not only plays with theory, but also practical application at the very edge, was very helpful in furthering my understanding.

 

[fgray1]

Hey I had fun watching Made for a great 2 days of diving. I still think they need a elevator at 40 fathoms.

 

[jeandiver]

OK , no worries , I will let all of you get back to your conversation but:

THANKS ANDY !!!!
Yes , first time at 150 was a bit spinny , but Not Bad !!!
I also wanted to go down to the top of the van but er , that blows the profile...

I had an awesome time with everyone...
Except , of course , I blew a weenie lift bag...
(oh well , I am a weenie , I guess)

I enjoyed the 2nd dive so much that I started singing at 147 feet...Now what I was singing , I don't quite remember , but Rick said it made him start laughing...

Maybe I was singing at Andy...

"Follow da tanks...Laa de daa.. Follow da Tanks"

All in all , A WONDERFUL TIME...
EXCEPT walking the doubles BACK UP the hill at 40 fathom...

Yes , we DO need an elevator...

Thanks again Rick (your awesome)
Thanks again Andy (your awesome)

Thanks again David...(you know why)

Jeano Beano

P.S.
I really appreciated getting to go to 150 on air...Well , now at least I can say that I DO KNOW what it feels like...2nd time wasn't quite as bad as the 1st ...