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Jim Cobb <cobber@ci*.co*> writes: > Any of the above fails you shut of valve of offending reg. You still have > access to all your air in both tanks. Independent doubles? Pony and in > deco? you are screwed. Jim. Gas Planning. If you're going to need eg. 20cf to safely complete the dive from the furthest/deepest point, then no, nobody in their right mind does the dive with a 13cf pony. A 30cf bottle would be more than enough, though. As with any form of independent doubles, it's more equipment, more weight, more drag, and more money. You need to "play by the rules" and have adequate gas in both systems; if either gets compromised you have to call the dive, the same as you would if either back gas reg in a manifolded system died. (Part of the reason IMHO for the pony-flamewars on Techdiver is that the kind of dive for which a small pony bottle is adequate reserve is rarely an "interesting" dive from the Techdiver perspective.) -- Anthony DeBoer <adb@on*.ca*> -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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