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George,
You missed my point because I was unclear. On a Doria type
dive my minimum gas mix would be 15/40. To air top a set of doubles
three times after using one third of the gas each time, I would have
to start with 10/90 to end up with something like15/40 on my last
dive. The difference between 15/40 and 10/90 is 33% more hang time.
> From: "G. Irvine" <gmirvine@sa*.ne*>
> >
> Ted, I guess you did not read or believe what I wrote. Let's start
> over. Helium is your friend. A few more minutes of deco is better than a
> deep air accident. With all due respect, switching gases is not a
> problem. I do it all of the time on dives that are far more serious than
> anything we are talking about here. Again, a tad more deco is no big
> deal, If one can't figure a whole matrix of tables and hold that concept
> in one's mind, don't dive, or don't dive on a gas that makes you forget
> these things. I have no idea what my final bottom time will be on my
> dives. I have a guess, but that is it. I carry a "shape" table only. Gas
> divers whould spend some time thinking this stuff out , Ted.
>
> I was told that equipment load is a problem for the boats. Janet Beiser
> now tells me this is bullshit. That leaves no excuse for the air divers.
If space isn't a problem, I'll take 4 sets of doubles with 15/50.
> I like Bott's solution myself - well thought out by Bott, and handles
> the other big problem we hear of in New England, which is heavy gas
> usage due to the cold and current.
>
> Ted, you have a computer and deco programs - work out a few scenarios
> and see what I mean. I am just telling you from extensive experience
> what I have found to be true. You will see what I mean. It al depends on
> what you werer originally taught to believe, and what you perceive the
> risks to be. This is clear with me.
>
I agree that there is very little difference between 15/40 and 15/50
as far as deco schedules are concerned. However, between 15/40 and
10/90 there is a substantial difference.
Ted
Ted Green (owner)
Tidewater Aquatics (Dive Store)
Salisbury Maryland USA
TDI IT #029
SSI MI #178
The world contains but three types of people:
1. Those who make things happen.
2. Those who watch things happen.
3. Those who wonder what happened.
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