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>Tom wrote:
>
>The updated version of the odessey though that you seem to have stong 
>feeling against even though you have not seen or used one is no more 
>susceptiable to this problem than other units. By the way you may be 
>shocked at the capability of this 'passive semi closed system", it 
>maintains a FO2 within 2% of the supply gas regardless of depth or 
>workload. 

What is this variation based on?  Bennet and Elliot give the expected
variation in FO2 for this type of system etc. as about +-5%.  For the 
semiclosed constant mass flow rebreather Bill and I are diving they 
give a variation of about +-15%.  However we observe a variation of
about +-8% and then we really have to try. For "real" diving the variation
in FO2 is more like +-3%.  This makes me think the numbers quoted in B+E 
are population variations and for a given diver the FO2 will stay in a 
much narrower range.

Barrie

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