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Al, Ok, we're doing better now... getting into the nuts and bolts of things... this is what I was seeing if anyone would do. > Two bladders in one cover right? The one bladder doesnt provide enough lift > at depth so you fill the other. If you are using them this way, you have fucked up. I haven't heard people claim to use a drysuit as EXTRA inflation, but as backup inflation in case the primary fails. > The second bladder now trips the first > bladder's overpressure dump. A full drysuit wont cause your bc to dump, and > proper weighting avoids the whole mess. Yes proper weighting lets you use the 2nd bladder as a backup in case the primary fails. You should not be on a dive where end up finding that golly gee-whiz I am not buoyant enuf with my primary buoyancy device. Second, as I don't own a set, and you ahve said you don't own a set, I think you are making an unjustified assumption here. You imply that one of the bladders full will occupy the entire outer sac. This may (or may not) be true. The full inflation size of each bladder may be less than the interior volume of the external sac. Either way, I maintain you are using the wrong definition of backup buoyancy. Your definition is for additional buoyancy, they are different. One failure between 2 systems being used at the same time spells total failure. One failure between 2 non-concurrent systems means you switch the unused system. That is backup buoyancy. > If the first bladder is ripped what protects the second bladder?? I said > earlier you want two wings use two seperate wings with two seperate bladders > and two seperate covers, attached to one lp hose. *IF* I used one of these setups, first I would do the very same modification that George has proposed for single bladder wings. You can't argue with that. Add an old inner tube. Second I would always use the outermost (closest to the tanks) bladder as my primary, figuring that for punctures purposes it would be inflated keeping the cutting object 2-3 inches from the backup bladder. Thirdly, I've not heard the details of many BC failures in the first place, but I would have put the failure likelihood to be higher on some part of the air supply system, or simple contiuous abrasion with the cave thru restrictions or something. Rubbing one spot raw on the bladder. This would not endanger the 2nd bladder. But yes, from some kind of cutting failure, a drysuit does offer a marginal safety factor... then again if you manage to brush up against something that cuts your wings, I think you are going to be lucky that no other part of your body (and drysuit) brushes it either. Either way, I do not see the added complexity of drysuit diving as always being worth that possible marginal advantage. The buoyancy issues of that, and the economic issues, cannot be said to be clearly in favor of a drysuit in all conditions. But hey, like I said we're making progress here. At least we are discussing the topic, and one of us (or both of us) might end up learning something. Mike -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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