>Andy Johnson wrote:

>> >That's my answer too.  A reverse profile is a concept that comes from
the
>> >days of square profile dive planning, when it could be defined.  As
near
>> > as I can tell, it has no common definition and, I suspect, can't have
>one in
>> > a multilevel diving world.  Fortunately, the most recent information
on
>the
>> >subject seems to conclude that there's nothing special about a reverse
>> >profile anyway, that the prohibition against them was simply one of
those
>> >tweaks you mention, applied before there were computers to apply it to.

>> There is something very special about a reverse profile, but it is not
>new,
>> and that is that you do not get such good profiles doing the reverse
>> profile, consequently there is bugger all information available on them
as
>> most people do it the 'sensible' way round to get better profiles.

>Just as you responded with something I didn't mean, I'll accept your
>statement and then respond with something you didn't mean.  You and I have
>both done dives that, in a traditional sense, were reverse profiles.  In
>fact, I imagine we did a few together.  All of them were good profiles by
>any measure I use.

>Another good example of how difficult, maybe impossible, it is to define
or
>effectively discuss reverse profiles in a multilevel, computer
environment.

>Lee

>PS:  Giving credit where credit is due, Bob said this first.  I'm just
>adding my 1 or 2 cents.

Actually I should have changed the Subject, my point was that while you, I
and most people on this list are fully aware why we shouldn't normally plan
for a reverse profile, some people blindly state that it is forbidden.
Taken to the extreme you end up doing shallower & shallower dives 'til
eventually you can't take a bath :-).
I am more than happy doing reverse profiles - within reason.

p.s. for anyone who does NOT know why reverse profiles are avoided, get yer
table out & try something like two dives for 25 mins, one to 20m & one to
10m with a 90min SI - I'm sure the BS-AC 88 tables work out giving a nice
example for this.

Andy Johnson
Senior Product Support Specialist
UK HSC DASD
Basingstoke AL1C
Tel: 01256 34 1474 (Hunting Group)
Tel: 01256 34 1264 (Direct)
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