Tank601
Contributor
Tobin has already responded, but I will add a comment. Your diving rig, when you needed so much weight, was NOT a BP/W but a traditional jacket BC. By and large, these are positively buoyant, sometimes quite a bit positive. On the other hand, when you use a streamlined 6 lb SS BP with a simple web harness (no padding), it is quite negative relative to the jacket, so quite a bit of weight can come off your waist. Years ago, when I made the change from a Zeagle Ranger to a SS BP/W, I had the same experience - I dropped a great deal of weight. As Tobin mentioned, your exposure suit makes a difference as well, particularly for the shallower dives (at depth, where the neoprene is fully compressed, not so much). But, you should see a big difference in weight requirements between the jacket and the SS BP. But, it is better to think of the relative difference, rather than the absolute weight required. The absolute weight will depend on you, on the exposure suit (as Tobin mentioned, if you throw a drysuit into the mix, you really find variability), the environment (fresh vs salt), etc. But, if you are in a 3mm full suit with a shorty over it, and require 20 lbs of lead, and you change from a jacket BC to a SS BP/W, and everything else stays the same (mask, fins, whatever) you may see a reduction in the required weight of at least 50%. And, as for the surprisingly small absolute weight requirements that Tobin may have discussed, in fairness you did start of saying 'I dive wet - warm water with shorty - one tank'. If you dive only a shorty you will probably need less weight than with a 3mm full suit.
I was accurate in my first description - I just change the scenario a bit to give him an idea of what my body required as far as in the sea water. I'm leaning heavily towards the BPW but according to scuba diving mag, the inherent buoyancy is 1.8 lbs? So how did you drop 10? Not that I don't believe you, just trying to understand...
