DIR- Generic dual bladder wings...

[crofrog]

I have dual HP100's... they're heavy as eff... and even heavier while full of gas. You add in the reels, flashlights, deco/stage bottles and whatever other junk and getting balanced becomes impossible.

My wife and I dive double 133s (as do many others) and full in fresh water we can become positively buoyant with just our drysuit.

 

[beester]

Eddie Mercx is a fantastic cyclist. "The cannibal" won all of the grand tours and many of the classic races.

GPT-3 is getting more and more realistic every day, but there are still some unusual quirks.

He is! List of career achievements by Eddy Merckx - Wikipedia

In his best year he won 45% of all the races he entered (hence the cannibal nomer), which is very very hard, because the more well known you get the less other cyclists will cooperate with you, so you are basically racing against all the others.

In his first tour the france in his early twenties he won all the jerseys, he won al the monuments multiple times, the world speed record was not beaten for years... the fact that his wiki page mentions mostly the people who were able to beat him from time to time, tells more about him than his competitors... Yes I'm a fan ;-) And living in Italy, most italians are too (they are bike crazy).

I dive in 29 degree water and, yes, I use a bungied OMS double bladder, but I guess i get a pass from you because of the warm water. I have several thousand technical wreck penetration dives in this configuration, so I am satisfied that it works, FOR ME. This is an issue that will never be settled, you do you and I'll do me. FWIW, I spent a week diving with Nuno Gomez and can't remember if he was single or double bladder, but he had his own signature series wing, so i assume it conformed to his beliefs regarding double bladders.

Like I said, I'm not dissing anybody diving this setup if it makes sense. If you are diving a heavy steel set (why not alu in tropical water??) in tropical water with no thermocline, you'll need a 2nd buoyancy device, the only way is a double bladder. But this is a very specific requirement. Also hot/warm on the surface you can negate, we are talking hot water temperatures... not so many places on this planet where the water temp is soo hot you are going to overheat in a drysuit.

But that's very specific... for recreational dives no need, and if you dive trimix and alu tanks also no need. I've dived in a 3mm wetsuit, with a double set and stages in the 50-70m range (red sea), but not having a 2nd buoancy device was not an issue, because the weighing was balanced. (alu back set with tx, 50% stage with some He in it, and a smaller O2 tank).

But hey whatever runs your boat.

 

[kensuf]

He is! List of career achievements by Eddy Merckx - Wikipedia

In his best year he won 45% of all the races he entered (hence the cannibal nomer), which is very very hard, because the more well known you get the less other cyclists will cooperate with you, so you are basically racing against all the others.

In his first tour the france in his early twenties he won all the jerseys, he won al the monuments multiple times, the world speed record was not beaten for years... the fact that his wiki page mentions mostly the people who were able to beat him from time to time, tells more about him than his competitors... Yes I'm a fan ;-) And living in Italy, most italians are too (they are bike crazy).

I was a competitive cyclist and racer for many years, I'm a fan of Mercx as well. There may even be a few Italians on my list, some guy named Coppi. Speaking of Italy, one of my favorite "Baller" cycling pictures is of an American in Italy.

 

[Lorenzoid]

I realize this is a DIR forum, turned into more of a GUE discussion, so I'll tread carefully, but why is having a backup piece of equipment a bad thing? I read the entire thread, please let me know if I've missed an argument against having a second bladder:

That is exactly the kind of question that's encouraged here.

 

[bakodiver391]

Aluminium tanks have terrible buoyancy characteristics. The swing from negative to positive, and most of the buoyancy in the bottom third of the tank, make them unusable to me. Also they don't have enough capacity for long penetration dives. So I'm happy with my lp85's and double bladder setup. I've supervised easily 10k technical dives, and I've seen problems with drysuits, problems with not having redundant buoyancy, but never a problem caused by a double bladder.

 

[crofrog]

Aluminium tanks have terrible buoyancy characteristics. The swing from negative to positive, and most of the buoyancy in the bottom third of the tank, make them unusable to me. Also they don't have enough capacity for long penetration dives. So I'm happy with my lp85's and double bladder setup. I've supervised easily 10k technical dives, and I've seen problems with drysuits, problems with not having redundant buoyancy, but never a problem caused by a double bladder.

You realize the weight swing from neg to positive doesn’t actually matter right and in someways can be helpful. As it reduces the tanks weight as a percentage of your total weighting and can allow you to then place that weight where you want it.

The total weight swing is a function of the vol of gas carried not the cylinder.

 

[bakodiver391]

I have several thousand technical dives under my belt. i feel that I've given aluminium tanks a fair trial and then kicked them to the curb. They may work for you, they don't work for me. End of story.

 

[beester]

I was a competitive cyclist and racer for many years, I'm a fan of Mercx as well. There may even be a few Italians on my list, some guy named Coppi. Speaking of Italy, one of my favorite "Baller" cycling pictures is of an American in Italy.

Yes Coppi is certainly in the top 5 of all time greatest cyclists... maybe even number 1, because he lost quite some pro cycling years due to WW2 happening. Same happened to another Belgian Philippe Thijs who won 2 tour de frances before WW1 and another after WW1 ended.. who know what would have happened if he would have been able to ride during those 5 lost years.

Anyway living in Italy, they are crazy about cycling too, and sometimes it really gets crazy (referring to your pic above). The Giro d'Italia is run late may, but in the high mountains there is still lots of snow. Last year close to where I live there was recordbreaking snowfall, and they had to cut short some of the high stages because you simply couldn't get through.

Heroes all of them ;-)

 

[Wibble]

Yes Coppi is certainly in the top 5 of all time greatest cyclists... maybe even number 1, because he lost quite some pro cycling years due to WW2 happening. Same happened to another Belgian Philippe Thijs who won 2 tour de frances before WW1 and another after WW1 ended.. who know what would have happened if he would have been able to ride during those 5 lost years.

Anyway living in Italy, they are crazy about cycling too, and sometimes it really gets crazy (referring to your pic above). The Giro d'Italia is run late may, but in the high mountains there is still lots of snow. Last year close to where I live there was recordbreaking snowfall, and they had to cut short some of the high stages because you simply couldn't get through.

Heroes all of them ;-)

Belgian beer's way better than Italian beer!

Peroni: just say no.

 

[crofrog]

I have several thousand technical dives under my belt. i feel that I've given aluminium tanks a fair trial and then kicked them to the curb. They may work for you, they don't work for me. End of story.

Sure, but for 1000s of technical dives I'm surprised you to understand that swinging from neg too positive on a tank doesn't actually matter, for that matter some steel LP85's and HP133's do the same thing and there are some AL80s that end neutral to negative...