Simon
Interesting, so this might imply that the "average" BCD actually has more buoyancy
Definitly yes
The camera encourages me to minimize my weight. This struck me some years ago when I had too much weight so had to add a significant amount of air to my BC. Every time I got close to the reef the air bubble would move and throw me all over the place.
So my mantra now is
No Neoprene, I wear a dive skin for protection against stingers in the water
Minimum weight, No need to add but a token squirt of air at the start of a dive
Buoyancy, Practise controlling my vertical position with my lungs not the inflator.
If I got this right I would only have the weight to offset the air I use in the tank and maybe even less than that.
As at photographe,r victor, how do you find it for getting upside down or on your back?
Do you feel it wants to roll you back over?
No issues underwater, again I think it's the position of the air bubble versus the lead that provides the torque which tries to turn you around underwater. This is very evident if you drive a dry suit. Let the air bubble get into your feet and you will be doing a handstand a second later.
No air in the bladder, minimum lead, once you have your trim set you can hang anyway up. Often I find myself head down in the reef or rolling on my back to photograph upwards. Biggest issue is my reg breathes wet and heavy when I am on my back. Must look for a replacement at some time.
Now on the surface if you fully inflate the blader, it is behind you so tries to push you onto your front. You can push back and lie on top of it or only put as much air as you need to get comfortable.
I would recomend this system to anyone, if you are diving in warm water, buy the smallest bladder, don't buy padding, comfort bits, deluxe harness, etc. you won't regret it