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We are saying the same thing, Ted - Bott has the good solution. I bring it up to point out that there are good solutions to these situations. I know you don't dive any air and I know you don't recommend it, but on the deco side I think we need to realize that air deco is inaccurate, and minor variations in gas deco are well worth the increased safety and pleasure of the dive. We are taught to fear deco from our PADI days ( squares from a black box, mandatory safety stops, etc) where deco is the penalty for bad diving behavior. Deco is your freind ) Parker used to tell me). I used to read books at deco, since I still viewed it as a penalty box. Now I don't do anything at deco. Ted Green wrote: > > 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. > -- > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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