Wing deflation, is it more difficult than normal jacket style BCs deflation?

[Solly]

Hello, I recently had my BC. It is a poseidon besea w100. It consistes of a harness with its BP and a separate wing. During my first few dives with it I noticed that for deeper dives (> 20m) deflation and getting rid of air inside the wing is easy, even when approaching the surface, however for shallow dives (8-15m) it becomes very difficult to get rid of all the air in the wing causing me to get sucked up near the end of the second dive without completing the safety stop.
Is that normal and I have to get accustomed to it and see how I can deflate the wing fully in shallow dives or was it due to being only the second dive in the BC and I will have better control by diving more in it? True that the shallow dives were my first 2 and the deeper dives were the 3rd and 4th... is it the depth or is it that I became more acquainted with the BC?

Thanks

 

[300bar]

More likely,due to the fact that the Poseidon BC series has a VERY thick padding,witch is just to floaty for my taste.Just add 1 or 2kg to compensate for the waistbelt.

just my 2cts.

 

[Jorgy]

I believe the W100 is a doubles wing, with 100 lbs of lift.....

Were you diving a single tank?

I have a 60 lb wing that I tried to dive with a single LP95 tank......

It was very difficult to vent all the air with the single tank .....no issue at all with twin LP-85's........

In my case the wing wrapped up around the tank and trapped air, I would have to stop become vertical and lean back a bit to get all the air out......

Hope this helps...........M

 

[tgsmith]

I've never experienced that with the 3 different wings I've dove.

Are you coming up horizontal or vertical? Reason I ask is that you shouldn't have any problem doing it vertically. Horizontally, possibly, for obvious reasons. I'm not familiar with that wing, but note that if you(for whatever strange reason) are set on ascending completely horizontally then you may find using the butt-dump easier if you don't like lifting up your upper body. Again I'm not familiar with this wing you have.

 

[ianr33]

Are you coming up horizontal or vertical? Reason I ask is that you shouldn't have any problem doing it vertically. Horizontally, possibly, for obvious reasons. I'm not familiar with that wing, but note that if you(for whatever strange reason) are set on ascending completely horizontally

Now why would anybody want to ascend horizontally ?

 

[Jorgy]

I was horizontal - the wing is a U, the butt vent worked great for the side it was on but air would pool at the bottom of the opposite of the U.....only when using a single LP95..........

I could fully vent the wing, but it is much easier with my Pioneer 36 lb single wing that I now use with for my cold water single tank rig.......

M

 

[Jorgy]

Makes the dive last longer........

M

 

[rsmith4656]

I dive with a Dive Rite Trans Pac II and at first I had the same issues as you. I learned that I must be in a vertical position to be able to get all of the air out of my wing at sallow depths. While at a deeper depth the pressure of the water will force the air out. It will help to learn the best way to trim your self for this BCD type. And like the other person said you may want to be sure that the wing is appropriate for the tank or tanks you are using. I have different wings for different lift needs.

 

[Solly]

Thanks all for the valuable input. In fact most of what was said makes sense. I dive a single 15L steel tank and my weights are balanced such that with an empty tank and fully deflated wing I would still be slightly negative (padding is already compensated for, I already had 2 kgms added for that).
I can't see the part related to trapped air, the wing is smoothly around the tank with clear passage all around. I found that the best way is always to be vertical with a slight lean to the right to have air go towards the deflator. The kidney dumps do not work as I really have very small amount of air inside the wing, but they work at larger depths as I usually need to inflate the wing a little bit.
I think I would go for another smaller wing anyway and use it for shallow dives and the bigger one for deeper dives or with double tanks.
But I will have this till after I get my regulator first

 

[Cave Diver]

Some of the U shaped wings have smaller "necks" that can get pinched by the hoses making it difficult for air to travel from side to side in the wing and harder to vent. The position of the inflator hose can make a difference as well. Some of them are over the shoulder, others are more towards the middle. Learning the nuances of your particular wing can make a lot of difference. It helps to have a buddy watch so they can tell you exactly what's happening.