Question Iso-risk decompression schedules

[dmaziuk]

And again, I will say this is not exactly correct. You are ignoring that the model (a specific model implied by your use of the term "GF") uses multiple compartments - each of which has its own GF and its own risk level.

The compartments are hypothetical. I strongly doubt Herr Doktor went so far into the weeds as to try and quantify risk for each individual unreal tissue. I believe the spacing/timing of tissue compartments is designed to approximate the overall picture -- like the integral is designed to approximate the area under the entire curve, not of each of its individual slices.

I think what you're talking about is the kind of DCS: skin bends vs. joint pains etc., and it's a very valid point, but the problem with it is you have to get bent to find out which one it is. Until you do it remains, like the tissue compartments: hypothetical.

 

[stuartv]

The compartments are hypothetical. I strongly doubt Herr Doktor went so far into the weeds as to try and quantify risk for each individual unreal tissue. I believe the spacing/timing of tissue compartments is designed to approximate the overall picture -- like the integral is designed to approximate the area under the entire curve, not of each of its individual slices.

I think what you're talking about is the kind of DCS: skin bends vs. joint pains etc., and it's a very valid point, but the problem with it is you have to get bent to find out which one it is. Until you do it remains, like the tissue compartments: hypothetical.

So, you think they used statistics from dives to work out some of the M-values and then just made up the others?

 

[dmaziuk]

So, you think they used statistics from dives to work out some of the M-values and then just made up the others?

I'm sure you remember that Haldane didn't even do that, he had the M-value of 2:1 (and made up 4 tissue compartments with half-times). Buhlmann, OTOH, made up M-values from tissue half-times: a = 2*T^-1/3, b=1.005-T^-1/2.