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Hello Sean,

The question is why to use for deco Trimix50/25 instead of Nitrox50?
Oxygen window is not an issue because in both cases is the same.
Tissue overpresure is not the case because is the same.
Inert gas half times are telling me that Nitrogen is better - it is slower
gas
than Helium and when used Helium is pushed out fast and Nitrogen
loaded slowly - total overpresure is decreasing faster.

Try so run few simulation on Abbys or Z-plan and according these models
is Nitrox50 better. (allows shorter deco)
May be the teories on which are these programs based must be rewieved.

So the reason must be different. George, can you please comment on this?
(or may be Bill Mee ?)
You have proved that Trimix50/25 works in real world. And it interest me 
to understand  how and why ?

Is the reason only the physiological damage that Nitrogen does ? Is it realy

such an issue in 21m on Nitrox50 (PpN2=1,55Bar, END=9,62m ) ???


Best regards

	Jozef Gliviak
	Slovakia  


Sean:
>>>You also will notice an improvement if you use trimixes as deco gases,
>>>such as 35/30 and 50/25, in addition to the oxygen.

Jozef:
>>Please, would you be so kind and explain why is it good to add He to your
>>deco
>>gas (e.g 50/25) ? Everything I know tells me that Nitrox 50 would be more
>>appropriate.
>>I know that some guys use it this way, just couldn't figure out why it is
>>better.
>>As far as I know by using Nitrox you create highest presure differential
for
>>Helium
>>causing it's accelerated offgassing.

Sean:
>The Helium is a fast in - fast out gas, and does not do the
>physiological damage that nitrogen does to your system.  The real issue
>is how you are trying to achieve the decompression - do it through
>proper application of the oxygen window rather than by maximizing your
>tissue supersaturation, and avoid ongassing nitrogen at the shallow
>stops.

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