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Don Burke schrieb: > MV> ? Are you saying it is beyond the capacity of learning ? for how much % > , 80 or 20 % ( Would it make that much difference , anyway ) > > I believe about 80% would eventually pass and about 20% would continue to > fail, more than enough to put many dive shops under. Well, it is a big step for a most AOWDs to continue any further, so if 100 % is the number of people interested in more education, I hope your 80% are correct, however it may take more time to teach than what you want / should get paid for. I have met responsible divers with poor math skills, and Nobelprize suspects I do not want to be near water with. Are you saying that a failure rate of more than 20 percent would put the economic situation of a dive shop at risk ? Uff, that 's hard stuff. If true , doesn't this reflect a fault in the general approach to diving , training , exercise; and last not least whose fault? > I know people who can't handle the math for Nitrox certification so they are > eternal Nitrox students and only dive Nitrox with their instructor. Sure. If everybody is content with it... > > I spent a week on Bonaire and as I recall the pattern was something like 130 > feet or less on the morning dive, 100 feet or less in the afternoon and 80 > feet in the evening. It has been a while so the numbers may be off, but you > get the idea. I would imagine many outfits use a similar scheme. Well, this sounds pretty safe, in these waters. > > Using helium for the evening dive would make little sense since it shortens > the no-stop times and narcosis is a minor or nonexistant issue. Why use > helium when it isn't needed? Yep. If everybody would use it , be it after some certification or DIY,because they heard it was en vogue for less breathing resistance, no narcs, no fear of depth.... I wonder how fast the He resources would be screwed up. > I think they would be pretty complex. The nitrogen and helium would be at > different partial pressures for each mix (including Nitrox and air), so some > allowance would have to be made for the differences. > Mandating a minimum surface interval might cover this (like PADI does for > Nitrox), but I don't think the other problems will be resolved any time > soon. But you addressed a way of to solve this, giving a worst case scenario to take into account , and coming out with some sort of one letter effective residual value, at the same time limiting the range of mix to a standardized one. -Matthias -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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