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Notice I said" my time starts when I reach the wreck", it came up to 300 ft , which is where I got to it. I have always been able to shave time off my deco, this was not one of those I think. I am not worried about extra minutes, funny thing the other 2 were never more than 30 ft from me. I did 15 more mintues of deco than them. They were fine. At 02:23 AM 6/13/00 -0400, Mike Rodriguez wrote: >At 05:21 PM 6/12/00 -0400, Capt JT wrote: > >Hello JT, > > >I used mixes as follows > >10/60 bottom mix > >20/20/60 as travel to 100ft and then as my deco gas on return > >starting at 230ft > >32% at 130ft > >50% at 70ft > >100% at 20ft > >I ran a 12 minute BT and that starts when I reach the wreck, my run time > >was 115 minutes and I got out of the water. > >Decoplanner, with default 30/85 GF, gives the following: > >Bottom Run > Time Time >================= > > 12 111 > 13 121 > 14 132 > >Notice that each minute on the bottom adds about 10 minutes to deco. > >At depths beyond about 300 feet you run into these very steep curves >which require more precision in everything from your mix (a 2% variation >in your FO2 at 400 feet changes a PO2 of 1.3 to nearly 1.6) to your >bottom time. > >Counting bottom time starting when you hit the bottom doesn't work well >for dives in the >300 foot range because every *six* seconds of bottom >time equate to ~one minute of deco. The time you spend on the way >down on dives of this magnitude significantly add to the gas-loading. >The 60 seconds you spend on the way down from 300 feet to the bottom at >380 alone add about seven minutes to your deco. > >On shallower dives, counting bottom time starting on the bottom works >because the curves are less steep. In the time it takes to get from >the surface to 200 feet, for example, gas loading is not significant. >This is why you can get away with beginning your ascent *about* on time, >and staying an extra minute or so is no big deal. At 400 feet, staying >an extra five seconds ads about a *full minute* to your deco. This is >especially true on bounce dives where the compartments pass only the >first few half-times (and don't approach saturation) and are on-gassing >most quickly. > >I usually count bottom time starting when I get to the bottom *except* >when the dive is deeper than 300 feet; when I dive below 300 feet, >I count it from the time I reach ~200 feet (when the curves begin to >steepen). > >-Mike Rodriguez ><mikey@mi*.ne*> >http://www.mikey.net/aue >Pn(x) = (1/(2^n)n!)[d/dx]^n(x^2 - 1)^n "You can't learn to dive on the net, sooner or later you have to get in the water" Your Guide to Great Wreck Diving along the East Coast & more Web Site http://www.capt-jt.com/ Email captjt@mi*.co* -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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