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Date: Wed, 08 Dec 1999 13:39:44 -0500
To: "Scott" <scottk@hc*.co*>
From: Mike Rodriguez <mikey@ma*.co*>
Subject: Re: decompresion gas selection and procedures
Cc: "Gliviak, Jozef" <Jozef.Gliviak@co*.co*>,
At 10:08 AM 12/8/99 -0800, Scott wrote:

>> >May be the teories on which are these programs based must be rewieved.
>>
>> Exactly.
>
>Which leads us back to the crux of the biscuit:
>
>What is the source for the proper deco zeitgeist?
>
>I have been playing with GAP of late, and I kinda like it, but, we have to
>wonder. It always and still puzzles me why helium should take longer to
>decompress than nitrogen. This according to all information and software
>available to me.

That's the problem with the generally available models.  Decompression
from Helium is *faster* than from Nitrogen, not slower.  It also
happens to be more prone to bubble if you drop the pressure too quickly.
In practice, that means the first deco stop is deeper than the
generally available models suggest, but you still finish deco in less
net time.  This is all still largely guesswork, though.

-Mike Rodriguez
<mikey@ma*.co*>
Pn(x) = (1/(2^n)n!)[d/dx]^n(x^2 - 1)^n

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