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In message <199610110149.BAA03507@ma*.te*.co*.au*>, troppo
<troppo@te*.co*.au*> writes
>At the risk of covering old ground, I have an observation to make on the 
>Atlantis.
>
>When I dived one, I found I was causing an open circuit effect, as the
>variable volume was insufficient for my lung capacity. 

Hmmm... find that one hard to believe, but OK, what chest size (viz-a-
viz lung capacity)
>
>I found on exhalation, I was dumping gas as the bags reached capacity, then 
>triggering the demand valve upon inhalation. The dump valve WAS set correctly.

I think you'll find that the dump valve was not set correctly (the
symptoms you describe are a classic indicator for this), but please
indicate the number of clicks from closed.
>
>Obviously, this would not happen during the average dive.

What was not average about the dive?
> 
>
>The possible result of this is obvious.

For sure - not much duration due to gas usage.

Regards

Chris

E-mail:- chris@de*.de*.co*.uk*

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