Rec Trimix

[Diesel298]

Wasn't trying to prove anything or teach anything. Just highlighting the positions that people take. I guess thats what you are calling "spam" or did you mean something else and just misspelt it?

no thats what i ment
only because you refered my comment back to your post as if you where implying that i was not willing to acept new theory in diving..
if someone shows me that duke report ill start looking into it a little more but im not gonna start recalculating my ongasin and off gasing based on a post i saw on scubaboard by somone i dont know.

 

[JeffG]

if someone shows me that duke report ill start looking into it a little more but im not gonna start recalculating my ongasin and off gasing based on a post i saw on scubaboard by somone i dont know.

I doubt it would be radically different anyways...otherwise people would be bent like pretzels. But just like back in the "old days" when nitrox was considered a voodoo gas, the same mistake could be being made about helium. There is probably more that we don't know about helium and deco, than what we do know.

 

[Diesel298]

I doubt it would be radically different anyways...otherwise people would be bent like pretzels. But just like back in the "old days" when nitrox was considered a voodoo gas, the same mistake could be being made about helium. There is probably more that we don't know about helium and deco, than what we do know.

agreed, and im right there to learn from it..
but i need to know thats the way it is, not just a rumor...
im always looking to expland

 

[Marlinspike]

45-55F, <=20 ft viz, dark, 100 fsw, 6k ft round trip on a scooter. i've done basically the same thing without the scooter (only with around 1500' of linear distance) and the narcosis is not pleasant. add the scooter and the ability for the scooter to amplify how fast something can go wrong (particularly entanglements with monofilament and separation) and i think 30/30 is warranted. add in running your own line and exploring dive sites that you have no information on, and i think 30/30 is required.

Sorry dude, but to me that sounds like someone making an excuse for doing it wrong. Sounds like the situtation you just described is exactly the reason why people dive doubles and true redundant configuration.

~Marlinspike

 

[Diesel298]

o common now.
thats a stressfull dive and justifys a 35 fsw end

 

[TheRedHead]

Are you sure? Serious question because I saw somebody on one of the DIR lists discuss a study done by David Doolette (Duke, Navy) that showed He and N2 uptake were roughly the same in all critical areas and most other areas, and the washout rate was faster with He than N2. Maybe the helium on-gases faster is just another myth? If anyone has more on this then pelase let me know.

Here's the link for those who have access: http://groups.yahoo.com/group/gavinscooters/message/3470

Hearsay, really. I didn't see the study or the data. This is an interesting statement made by the author of the post:

Some interesting things came out of the GUE conference. Nothing was
really a surprise to me, but what really interested me is that there are
studies that are starting to prove out what we've believed to be correct.

GUE has been operating on a belief? This post is not supportive of your position.

 

[*Floater*]

Hearsay, really. I didn't see the study or the data. This is an interesting statement made by the author of the post:

Some interesting things came out of the GUE conference. Nothing was
really a surprise to me, but what really interested me is that there are
studies that are starting to prove out what we've believed to be correct.

GUE has been operating on a belief? This post is not supportive of your position.

I didn't realize I had taken a position?

Anyway, GUE's current teachings are very much influenced by what the WKPP guys learned during their exploration dives - and from what I understand, George, JJ and some of the others basically used themselves as guinea pigs by experimenting with deco, pushing the accepted limits, using mixes other than what was recommended at the time, subjecting themselves to doppler, blood and other tests. Did your instructor do that? What's his belief based on?

To quote George from back in 1999:

"Helium and heliox require shorter , not longer decompressions. What the real story is that the "air" tables are all wrong, and should be longer than trimix ( all things being equal ) and in fact air should require the deeper stops that helium seems to ask for in the current "models" in use. The misconcpetion is then that high helium needs more deco. The more I have, the less I do."

 

[Diesel298]

I didn't realize I had taken a position?

Anyway, GUE's current teachings are very much influenced by what the WKPP guys learned during their exploration dives - and from what I understand, George, JJ and some of the others basically used themselves as guinea pigs by experimenting with deco, pushing the accepted limits, using mixes other than what was recommended at the time, subjecting themselves to doppler, blood and other tests. Did your instructor do that? What's his belief based on?

To quote George from back in 1999:

"Helium and heliox require shorter , not longer decompressions. What the real story is that the "air" tables are all wrong, and should be longer than trimix ( all things being equal ) and in fact air should require the deeper stops that helium seems to ask for in the current "models" in use. The misconcpetion is then that high helium needs more deco. The more I have, the less I do."

now were talkin..
some info to back up the statement...
shoulda played that card earlier....

 

[TheRedHead]

Floater, the US Navy has done a lot of research on helium. My instructor's information is, I suppose, from his instructor who was the first Trimix instructor in the USA and a Trimix pioneer. Do you want to have an instuctor pissing match by proxy? Who was your instructor?

The standard school of thought is that helium both ongasses and offgasses more quickly so you will have a deco obligation faster as well as offgass faster.

 

[Diesel298]

awesome a pissing match..
i saw this comming....
just remember dont pee INTO the wind