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George (honestly unsubscribed) Irvine wrote: > Harold, 13 ft is more that you need until something > goes wrong. I carry 15 cu ft in a 2015 psi aluminum tank. > In a cave dive, if you rip your suit, and then have to go > through a deep section to get out, it is a problem if you > have run out of gas. At deco, a ripped suit will require > repeated additions of gas. I basicly am carrying three times > the gas required for normal operation. By the way, argon > increases the efficiency of a material like thinsulate by > about 50%, while being wet reduces it to 80%, so if you > are wet and on argon, you are still better than dry on > air, and I have done some seven hour wet decos without any > problem with 15 ft of argon. - George Irvine IMHO, this information is completely misleading. Argon is a less efficient heat conductor than air, it does not increase or decrease the efficiency of a material. This may be just semantics but then I'm not an expert. As an expert, I'm also surprised that you would make a definitive statement about the efficiency of thermal underwear in a ripped suit. In my ignorance, I would have thought it would depend on the seriousness of the tear and the water temperature. If your suit is flooded, and you're in 40oF water doing a long deco, then you are bloody cold. Nobody is going to convince me that my underwear is operating at 80% efficiency. If you can complete a 7 hour wet deco without any problem, then you are diving in warm water and your experience is only relevant to warm water diving (JMO). Even in a 7mm neoprene drysuit, with all sorts of warm underwear and no leaks, I get cold in much less than 1 hour - but then I'm a weenie. Alan amw@be*.tl*.ne* PS George, plenty of hints in here as to where I'm from.
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