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> > I'd be willing to bet (and actually have some > > first-hand experience supporting this) that your > > narcosis would be as severe if not *more* severe > > on EAN-27 at 160 feet than air at 160 feet. > > 160 on Air------> ppN2 = 4.6 ATA > 160 on EANx27 --> ppN2 = 4.3 ATA > > Not much difference, granted, but clearly N2 narcosis would be greater on > Air. Greater chance of O2 tox though. Am I missing something? Apparently you missed the discussions on this forum earlier highlighting the concept of "oxygen narcosis". Regardless of whether you buy my arguments that O2 narcosis exceeds the potency of N2 narcosis, there is growing acceptence among the most knowledgable people in the field (Bill Hamilton, John Crea, etc.) that oxygen is at least equipotent for narcosis as nitrogen. In other words, to calculate an "equivalent air depth" (EAD), you should use the formula EAD = (PN2+PO2-1)*33 where EAD is in feet, and PN2 and PO2 are in atmospheres. This is both simpler, and provides more realistic values than the old formula, which only accounts for nitrogen. Using this formula alone, it works out that all nitrox mixtures have the same EAD, however I'm finding that I get more serious narcosis at greater depths on enriched-air nitrox than I do on air. Aloha, Rich Richard Pyle deepreef@bi*.bi*.ha*.or* ******************************************************************* "WHATEVER happens to you when you willingly go underwater is COMPLETELY and ENTIRELY your own responsibility! If you cannot accept this responsibility, stay out of the water!" *******************************************************************
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