>On Monday, June 14, 2004 6:26 PM, Andy M Johnson wrote:
>(snip)
>> Reverse profiles are not often done simply because you get better
profiles
>> (i.e. longer or deeper) by not doing them. Medical wisdom isn't really
the
>> influence, it's common sense to do the better profile.
>You've got a beter understanding of the mechanics of decompression than
me,
then! :-))
I don't have any tables to hand, but a quick play around will reveal all.
Try something like 30m for 20 mins followed by a 30 min SI then 20m for 30
mins, you might have to adjust the numbers a bit. Then try the reverse
profile, you can't do it without going into deco.....which is why we
normally don't do reverse profiles !!!!
>>However, as reverse
>> profiles are not regularly done there is very little information about
>> them.
>> But the one thing that always gets my goat is the DM who will insist
that
>> you make the first dive deeper so that you do not
>> do a reverse profile, I can't see the point.
>It's legal protection for the Instructor/DM/Dive Supervisor etc. etc.
i.e.
>as long as the 'rule books' say reverse profiles are bad - regardless of
>suspicion that they may not be - then the DM (or whoever's running the
dive)
>has an obligation to follow the standard wisdom in order to protect
>themselves. :-)
>In that regard, I've never had a problem - in the past, or now - if
>necessary I just lie to them in order for them to fulfill their
>requirements. I never, ever, argue with them! They're doing their job to
>the best of their ability. Some of them may not be as seemingly smart as
>the rest of us, but if they're good at what they do then it's incumbent on
>those of us who dive for recreation to listen to their teachings - not
>condemn them for following procedures designed to protect them from the
>fallout when things turn to shit!! :-)
>Strike
Ah, you mean they are more than blissfully ignorant of any deco theory and
happy to stay that way !!! I can accept it if they say, 'you have to do
this to protect us from litigation', but they always claim it is better /
safer, which is a patently false statement and dangerous. If (for whatever
reason) you have to do, say, a 30m dive followed by a 35m dive, there is no
point in going deeper to, say 40m, on the first dive just to prevent it
being a reverse profile.
Cheers.....
Andy.....
::.. Regards Andy Johnson
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