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To: rbell@cp*.or* (Ronnie Bell)
Subject: Re: Descent Rates
From: Frank Deutschmann <fhd@in*.ne*>
Cc: story@be*.en*.sg*.co*
Cc: dan@sh*.ne*
Cc: d.giddy@tr*.oz*.au*
Cc: techdiver@opal.com
Date: Wed, 25 Jan 1995 12:40:24 -0500 (EST)
Ronnie Bell sez:
> 
> You are quite wrong if I may say so. When carefully reading THE BOOK I 
> realized that I did not need to code for the descent (in my table 
> generating program). Buhlmans model and all TABLES generated from 
> a true implementation thereof implicity ongas "as if" you had made a 
> instant drop to the bottom. Buhlmans model assumes a 60 fpm descent rate, 
> and any descent faster that that reduces ANY conservatism that instant 
> descent may have provided.  

I think you need to read "THE BOOK" again, if I may say so.

The MODEL makes no assumptions about descent rate; it simply describes
the theoretical change in gas loading given a delta depth and a time
period over which the delta took place.

The TABLES were generated with an instantaneous decent.

Oh, and by the way, can you PROVE (and by prove I mean proof by methods
other than vigorous assertation) that descending faster than the descent
rate built into a table decreases conservatism?  Of course, we all seem
to assume this is so, but can you actually prove it?  Keep in mind that
if you simply show an increased theoretical gas loadinggiven by the model
that does not PROVE anything, other that ACCORDING TO THE MODEL conservatism
is lessened.

-frank 
-- 
fhd@in*.ne*  | [M]athematics is not the study of intangible Platonic
1 212 559 5534     | worlds, but of tangible formal systems which have arisen
1 917 992 2248     | from real human activities.
1 718 746 7061     | 	--  Saunders MacLane

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