END calculations

[Peter M]

Chris

I have read the study that you posted the link for and i do think that 10 people arent really enough to draw a conclusion though i can see the benefit of these studies.

[Leg Of Salmon]

Chris

I have read the study that you posted the link for and i do think that 10 people arent really enough to draw a conclusion though i can see the benefit of these studies.

You are absolutley right, there isn't enough data there to be taken seriously.

[MattS]

Have I screwed up the maths?

You did. It's right now you have edited it

[Kermit]

I read another study, some time ago, that did a double blind test which advised some of the subjects that the gas they would breathe would give them narcosis and the others that it would not. There was a larger correlation of narcosis with the subjects told they might get it than with the subjects told they probably would not; regardless of the actual gas they breathed.

Go figure.

If I had more time I could dig out the link but I have to do some w*rk....

[Dyson Diver]

there seems to be a lot of non quoteable double blind reports being done at the moment .

[The Duck]

It's just everything in the mix that isn't Nitrogen: IE Helium and O2 are non narcotic? ....

I'm beginning to think that the He might be worth considering - in some cases.

I belive that He is supposed to be 0.23 times as narcotic as N2, so with smaller fractions/percentages/amounts He in the mix it's nacotic effect is not going to be significantly different from treating it as non-narcotic.

However where larger fractions/percentages/amounts of He is used then the narcotic effect may not be able to be discounted.

What is defined as "smaller" and "larger" I've no idea.

[nigelH]

One of the most noticable things about narcosis is that if you ascend just a couple of meters quickly it clears. Now that doesn't make any sense in a solubility model or any O2 is/isn't narcotic consideration.

It is, however, good enough to go in many diving manuals and where I've seen it used (including had it used on me) it has never failed.

[shog69]

There's got to be an iPhone app for this

Not read the whole thread so thi has probably been answered, but yes, there are a couple of apps for iPhone or iTouch you can use for working this out and a whole lot more. I use iDeco