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Barrie
The new Halcyon follow up to the odessey maintains a 2% of the supply 
gas regardless of depth or ascent /descent rates. It also gives a 5 to i 
gas duration ratio at the surface, and gets better as one descends and 
reportedly up 50 to 1 at 10 ATA. I know that in a swimming pool we were 
getting about a 8 to 1 ratio on the weekend.
Tom
Barrie Kovish wrote:
> 
> >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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