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Don, "slower conmpartments " is what it is - slower. However, if you are
past peak presure and dropping, you are not ongassing just because you
failed to ongass deeper. If you switch gases , let's say from trimix to
nitrox where the nitrogen pp actually rose while ascending over what was
there , and there was a positive differential between the two ,then yes,
the new gas is ongassing, but so what - it is ongassing, it wil offgas
when it goes the other way. Slow is slow. The slow tissues are nowhere
near the fast ones, and if we do not adequately decompress the fast
ones, we get wacked. This is more of the usall stuff from the ususal
suspects, which falls under the old wive's tale flag. 

 Guys, we can not base deco discussion on thinking that is dead wrong to
start with. It is nothing more than happenstance that Bulhmanns model
even gets close ot working, and I can explain that to you in any
mathetmatical event in nature that you want to take as a model - any of
them will be quite good for decompression look-alikes, including the
curve of the joint loading as a function of the angle of of the draw
span on the 17th street bridge in Ft Lauderdale that just cut loose and
crashed the other day qwhe the brakes failed. I might use that schedule
for my next dive.

Mcinnis, Don wrote:
> 
> 3) we "SIT" on the 70 foot stop for quite a bit longer than is suggested
> by theory. The reason is we want to use that wide open oxygen window for
> all it is worth down there to both clear the slate as much as possible,
> and to move that ceiling again quite a bit so that we can abbreviate the
> stops above as their ppo2 declines, rather than lengthening them as
> either Bulhmann or bubble mechanics would indicate - real life says we
> are correct. In fact, I have SKIPPED up to 100 minutes of our 40 foot
> stops with no repercussions, and Lucy Ho can vouch for me on this ( and
> the doppler says so). The other reason is that we want to give the blood
> a chance to totally circulate with the new gas. While it hits the key
> body parts immediately ( spine, heart, brain), it takes a couple of
> minutes to get to everything properly. We do not want to hammer high
> popo2's, we want to use them to our advanntage.
> 
> George,
> 
>         Does this work because the saturation of nitrogen is low in the
> system due to using the higher amount of He in the mix? Everything taught to
> this point has been that the deeper stops saturate the slower compartments
> and therefore should add time to the shallower stops instead of subtracting
> from them.
> 
>         Regards, Don
> 
> 
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