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On Wed, 28 Aug 1996, <RDecker388@ao*.co*> wrote:
>George,
> I wonder if you might give us some insight into the useful range
>of air as a diving gas, ie., maximum safe limit. I can't recall ever seeing
>you define "deep air." Your input would be useful for those of us out here
>trying to learn to "do it right."
>
Bob, just using simple considerations like progressive loss of spatial
senses and increased debillition with depth, without getting into partial
pressures or effects on the circualtory system, we try to be guided
accordingly.
For example, 190 feet is great for deco on air when you have gas on yor back
and
vertical relief, but it is a noghtmare way back in a siltout in a cave.
We do it as follows other than the deco situation: we dive a 130 AED and a
1.4 PPO2 maximum, with reudctions in both for time and difficulty (lately I
have
been diving 1.0 and 100 feet, but then I am surveying and doing huge bottom
times that require long deco exposures to high PPO2's) . We will use air to 150
on a "look see" situation, or even drop to 190 with vertical relief, but not
intentionally plan this. Short bounce dives on air do not present huge
problems,
other than if the conditions are bad , but again, are not intentionally
planned.
Helium is an easy gas to use, and makes a huge difference in the quality of
your
dive experience.
If I want to get high, I will do that right, too, not put on my dive gear
and try to kill myself. - G
George M. Irvine III
DIR WKPP
1400 SE 11 ST Ft Lauderdale, FL 33316
954-493-6655 FAX 6698
Email gmiiii@in*.co*
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