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At 03:09 PM 7/09/1998 +0300, Teppo J Kurki wrote: >Having gone from 10 l/300 bar tank to 2x7/200 and now own also >2x10/200 here's my thoughts: >15 l >+ cheaper (probably) >+ a little more gas >- valves hard to reach (at the back of your neck) >- awkward because of large diameter (at least in my experience) >- need more weight >2x7 l >+ fit closer to your body => better balance >+ reaching valves a lot easier, since they stick out >+++ when you get larger doubles you can use _exactly_ the same setup and >you will have already mastered the right reflexes >- heavier on the surface >- more expensive TJK, the problem I have with the two configurations mentioned, the 15 litre single and the 7 litre doubles is in the ocean the 15 litre is too big. Unless the user is an unfit, incompetent hoover with enormous air consumption who shouldn't be diving, they won't need all that gas on any reasonable singles dive- no overhead, no deco ceiling, within bail-out reach of the surface. A 10 litre is plenty big enough and doesn't give you the management problems with the huge tank. I use a 65cu ft alloy on those kinds of dives and that holds enough gas for me to earn a deco obligation. Also a 15 litre single is useless for caves. The two 7 litres are too small to do any reasonable decompression or overhead dive, (rule-of-thirds gives you only a bit over 900 litres of gas to turn-around). At a useful planning consumption of 15lpm that's 12 minutes at 40 metres. For all the convolution of doubles, and two sets of regs, you might as well twin a couple of 10s or 12s and either get a reasonable dive in or leave yourself a better margin. In the one post, this guy came up with the two worst cylinder configurations imaginable. rgrds billyw -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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