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Date: Wed, 29 May 1996 11:45:59 -1000 (HST)
From: Richard Pyle <deepreef@bi*.bi*.Ha*.Or*>
To: "Peter N.R. Heseltine" <heseltin@hs*.us*.ed*>
Cc: techdiver@terra.net
Subject: Re: Physiologic safety parameters for SC rebreathers


> There is a much cheaper way to do this: If the student excercises (say on
> a stationary bicycle) at 1.0 ATA wearing/using the SCR as a breathing
> source, the VO2 can be calculated at a worst case scenario. I think this
> would be a useful part of standard rebreather training and would not add
> appreciably to costs.

I agree that is cheaper and useful, but it only provides data to plug 
into a theoretical model.  I think real-world testing on an actual unit 
would bypass the weakness of the model and cut right to the chase?  How 
expensive would it be to make a modified unit with an O2 analyzer?  
Dennis did it himself on his Fieno.  It wouldn't take much more to build 
a trianing unit.

> The CO2 is being absorbed by the canister *after* you get it out of your
> body. If I deliver a pPO2 to you of 1.2 ATA but in a volume of 150cc, you
> wont't run out of O2, but you will become hypercarbic, because I am not
> meeting your minimum minute respiratory volume needs.

I'm a little confused... What do CO2 levels have to do with 
loop/counterlung volumes?

Aloha,
Rich

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