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To: dan@sh*.ne* (Dan Nafe)
Subject: Re: Descent Rates
From: story@be*.en*.sg*.co* (David Story)
Cc: d.giddy@tr*.oz*.au*
Cc: techdiver@opal.com
Date: Tue, 24 Jan 1995 11:12:42 -0800 (PST)

Dan Nafe writes:
> 
:
> Dave! "the table models" do not assume a specified descent rate, at least 
> not the ones used by tech divers. Our implementation (MiGPlan, 
> MiGPlan.Mac) of the Buhlmann model assumes an instant descent.

Actually, all *tables* do assume a particular descent and ascent rate.
The current USN Tables, for instance, assume 75fpm descent and 60fpm
ascent.  Specifying an ascent and descent rate is necessary in order
to account for the gas loading during those phases of the dive.

However, I assume that by saying "table model" you are aware tables
and models are two different things.  Models generally allow any
ascent and descent rate, and if they are calculated in real time (as
opposed to tables) then the user can use any ascent or descent rate.

Assuming an instant descent penalizes the diver for gas loading which
is not taking place.  However, it is a conservative method.

Cheers,

David Story                        NAUI AI Z9588, PADI DM 43922, EMT
story@be*.wp*.sg*.co*		  Every dive is a decompression dive.

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