In Reply to: Do it right posted by Ross-O on May 01, 2006 at 13:42:29:

Ross,

Since I've been trolling this list lately to promote the Instructor Challenge, I thought I'd comment a bit. BTW, in my DIR-F class this weekend we raised $1,850 that we'll be donating to the Chamber. Any other instructors want to follow the lead??

Anyway, you wrote:

"As as wise ex-DIR instructor once told me, "You don't want to F-up and do an ESA on trimix"."

To which I would ask, who is more likely to need an ESA, someone with a clearer head as a result of Helium, or someone having the added drag of doubles and deco bottles with air in their tanks? Between the added drag of the doubles and deco bottle, along with the added gas density of air at depth, C02 toxicity and increased nitrogen narcosis are all but assured. C02 is up to a 130 times more narcotic then N2 so even if someone wants to advance the position that you can adapt to narcosis [ nonsense ], but even if someone were to argue that position, how can they defend the facts that 1) air gets denser at depth, and 2) C02 is way more narcotic then air???

Seems like someone is solving for the wrong problem(s) and worrying about things that are beyond the scope of the issue..

BTW, an ESA on air from 145' isn't such a great idea either..

Later