I'm a newbie who tried a BP/W for the first time today...

[dmaziuk]

Because water is neutral in water. As he added more air it would displace the neutral water from the wing with air from the inflator hose.

Assuming the water is covering the OPV and it's excess water and not excess air that gets pushed out.

 

[Doby45]

Assuming the water is covering the OPV and it's excess water and not excess air that gets pushed out.

That would be funny. The position you would need to be in to force that to happen. But yes, you make a point, if you are upside down and tilting to your right and your OPV was the closest thing to the surface of the water you would NOT be able to vent water out of your BCD. BUT, if you are in some sort of "normal" diving position, you could easily vent water out of your wing by adding air if necessary.

 

[dmaziuk]

That would be funny. The position you would need to be in to force that to happen. But yes, you make a point, if you are upside down and tilting to your right and your OPV was the closest thing to the surface of the water you would NOT be able to vent water out of your BCD. BUT, if you are in some sort of "normal" diving position, you could easily vent water out of your wing by adding air if necessary.

Well I am in that position practically every time I snap a picture, so... your "normal" may vary.

PS I'm not entirely convinced that in a jacket with multiple valves, it's the water that will be pushed out and not air, because of their densities.

 

[formernuke]

Welcome to the dark side of BP/W.

I will say if properly weighted you should need a 30 pound or lighter wing. I use a 40 pound for drysuit diving in very cold water and don't have to fully inflate it to stay up.