On Thursday, December 19, 2002 6:26 AM, Huw Porter wrote:

(snip)

> >> Being cautious, we had planned two minutes @ 24m, followed by 1@18,
1@12,
> >> 2@9 and [log in to unmask]  What I hadn't allowed for was how fast the stinger would
> >> *clock up* deco during the deep stops...  the worst case was on the way
> up
> >> from 18 to 12, where it briefly showed a rather heart sinking 19
minutes
> >to
> >> surface!

> >Now I just have to ask: Why that particular regimen?  (The reason that I
> ask
> >is, it seems to me, that the depth increments chosen by you are up the
shit
> >bonza!)  :-)))))))

> You didn't like it then!  (I thought it was a work of art!  Why do I feel
> like a lamb being led to the slaughter right now? :-))))

Mate!  I only said it to stir up some silt!  :-))))

I've now got to the stage where, as far as decompression is concerned, the
more I learn about it the less I realise that I know!  In that regard, I've
decided to ignore everything that I once accepted as being carved in granite
and start all over with an open mind!  :-)

> >> felt great on the boat, so I must have got it right.

> >I don't doubt, for one minute, that you got it right.  But what was the
> >basis for doing it?  :-)

> Well, because it was going to be an aggressive dive, I'd consulted my
> Buhlmann tables for 32%, which had told me no stop at 36m was 17 minutes,
> and up to 25 mins had a 5 mins stop at 6m.  My custom tables (with
gradient
> factors 80/20 and a safety factor) gave 1@12, 1@9, 4@6 for 20 mins at 36m.

> So, being conservative I planned for 1@12, 2@9, 5@6 as formal deco for
> anything up to 20 mins.

> First microbubble stop is halfway between max depth and first formal stop,
> or 24m, so I planned a full 2 mins there.  The second microbubble stop
> would then be 14m, but this seemed pretty close to 12, so I split the
> difference and called it 18.

> Wodya fink?  :-)

But - and as a matter of interest - what was your ascent rate between stops?
:-)

> P.S. I've had 'Good vibrations' going through my head all day because of
> you!  :-)

Now you've got me humming it again!  :-)

Strike