On Wed, 18 Dec 2002 21:16:18 +1100, David Strike <[log in to unmask]> wrote: >On Wednesday, December 18, 2002 12:18 AM, Huw wrote: >> The gloomy light levels, green rather than blue water, mean she is >> encrusted rather than coraled, and give the whole dive the atmosphere of >an >> immaculate UK wreck with the water warmed up, and simply smothered in >> astounding qualtities of tropical life. We were constantly parting thick >> curtains of baitfish, and the shape of the wreck shimmered and pulsed as >> the schools swirled around. > >Mate! That's sheer poetry - I love it! :-) Thank you. I've learned from a master! :-) >> 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? :-)))) >> 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? :-) Cheers, Huw -- http://www.huwporter.com