This has gotten to the point where it has become more of a troll that a useful thread, but I'll try to throw out a rational response anyway.
On 99 out of 100 dives nothing is going to go wrong. You need to make allowances for the one dive that goes funny, but for the most part, you want to be as streamlined, and as comfortable on the 99 dives. You still want to be able to cope with whatever goes wrong on dive #100, but you don't want to optimize your gear for failures that will rarely or never happen. So even if a double bladder wing makes life a little easier on dive #100, it adds a little extra drag, and a little more problems on the other 99 dives. Anybody doing tech level dives should be able to manage with a drysuit for buoyancy for one dive. You don't have to enjoy doing it, as you will probably never have to in your diving career.
The Dual bladder wing adds several problems. Even if it's not hooked up, you still need to make sure the second bladder is fully dumped before every dive. Leaving air in it makes problems. You also need to find somewhere to store the spare inflator that you can easily reach. You say to put it in a pocket, but what pocket are you talking about exactly? I've never seen a good, easily accessible place for this. Finally, you don't really get that much redundancy with a dual bladder. If you have a post failure, you still lose your power inflator, and the dual bladder gives you nothing. The only benefit is when you lose one and only one of your bladders. If you make contact with something that tears your bladder, you will probably lose both bladders, but more importantly, you are probably not controlling your buoyancy very well. Also, a large 85' wing is a lot more floppy and more prone to get snagged, so you are creating more problems for yourself by using a bulky wing in the first place.
If you have some problem with the wing delaminating, your second bladder will probably help you, but if there was a manufacturing defect with bladder #1, what says bladder #2 hasn't already ruptured and you don't know about it? So you have to routinely check the operation of both bladders, which increases the chances you will accidently leave gas in the wing during your dives.
So why no double wings? Because they are unlikely to help on Dive #100, and present issues during the other 99 normal dives.
Tom
On 99 out of 100 dives nothing is going to go wrong. You need to make allowances for the one dive that goes funny, but for the most part, you want to be as streamlined, and as comfortable on the 99 dives. You still want to be able to cope with whatever goes wrong on dive #100, but you don't want to optimize your gear for failures that will rarely or never happen. So even if a double bladder wing makes life a little easier on dive #100, it adds a little extra drag, and a little more problems on the other 99 dives. Anybody doing tech level dives should be able to manage with a drysuit for buoyancy for one dive. You don't have to enjoy doing it, as you will probably never have to in your diving career.
The Dual bladder wing adds several problems. Even if it's not hooked up, you still need to make sure the second bladder is fully dumped before every dive. Leaving air in it makes problems. You also need to find somewhere to store the spare inflator that you can easily reach. You say to put it in a pocket, but what pocket are you talking about exactly? I've never seen a good, easily accessible place for this. Finally, you don't really get that much redundancy with a dual bladder. If you have a post failure, you still lose your power inflator, and the dual bladder gives you nothing. The only benefit is when you lose one and only one of your bladders. If you make contact with something that tears your bladder, you will probably lose both bladders, but more importantly, you are probably not controlling your buoyancy very well. Also, a large 85' wing is a lot more floppy and more prone to get snagged, so you are creating more problems for yourself by using a bulky wing in the first place.
If you have some problem with the wing delaminating, your second bladder will probably help you, but if there was a manufacturing defect with bladder #1, what says bladder #2 hasn't already ruptured and you don't know about it? So you have to routinely check the operation of both bladders, which increases the chances you will accidently leave gas in the wing during your dives.
So why no double wings? Because they are unlikely to help on Dive #100, and present issues during the other 99 normal dives.
Tom
