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Hey Dan > > So the concept of "Blow and go" > could be seen as be begging for bigger bubbles, which could be more >problematic than the decreased nitrogen absorbtion "Blow and Go" was used to eliminate... Yes. By Causing a large gradient(~5ata) to exist between tissue nearly saturated at 260fsw (as all *fast* compartments will be after 25 min) and gas cavities pressurized at the ambient 100 ft stop, you could cause a population of bubble nuclei to start growing. > Typically Blow and go was followed by pure O2 at 20 foot and 10 foot stops, > with some air breaks, and this seemed (at the time) to be effective in > removing or shrinking bubbles...what are your current thoughts on this. It > would seem to me that at the very least, this was probably a great way to > "Farm" bubbles, It was the opinion of some bubble modelers that the importance of long, shallow stops in traditional deco schedules arose from the need to treat bubbles formed early on in the ascent (by neglecting deep stops). In addition to radicals like Rich and George who do DEEP stops, the rest of the deco-diving world often employ practices that look good from a bubble-reducing standpoint: > "pull" your 10ft stop at 20ft on O2. Supersaturation models (Buhlmann, etc)don't provide rational for the efficiency of this practice (the out-gasing should be th same because inspired FN2 is zero). Bubble models argue for pulling because the increased pressure will help drive gas out of bubbles. > Use nitrox 80/20 starting at 30fsw rather than O2 starting at 20fsw. Opening the O2 window as early as possible will eliminate bubbles. >IWR relies on bubble squashing ideas. Arguments against IWR based on the supposed inefficiency of Boyle's law in reducing bubble volume are idiotic. There may be good medical reasons to avoid IWR though.... >pause for a minute or two every 30ft from bottom up to your first Buhlmann stop. Regards, EM _____________________________________________________________ Eric Maiken email: ebmaiken@ea*.oa*.uc*.ed* Dept. of Physics o: 714 824-6621 U. of California fax: 714 824-2174 Irvine, CA 92715-4575
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