Gombessa- really?? wow i didnt kno i would only need that little of weight. ill probly take the 6lb adapter off if that is the case
umm, not sure I waste my valuable/limited luggage weight limits on a 6 lbs adapter......surely you can buy a more travel-friendly (lighter) adapter, at least for air travel ?
My STA is convertible - there's a 6lb block of coated lead that can be removed from the channel, and the remaining STA with cambands is maybe 2lb negative. IMO, along with a 5-6lb stainless steel backplate, that's probably all a typical person would need for no-wetsuit warm-water diving. I'm sure someone will let me know if I'm missing anything:
Human: anywhere +/- 3lb, probably slightly positive
AL80: ~2lb negative at start of dive, 4lb positive at end of dive
SSBP/unweighted STA: ~7-8lb negative with an unweighted STA
Regs: ~2lb negative
Shirt/trunks: let's call it neutral, it's definitely not buoyant exposure protection.
So without a wetsuit, you're looking to displace about 7lb of positive buoyancy at the end of your dive. Your SSBP + STA does about that by itself and you get another couple of pounds depending on your regs. You can control about 6lb using lung volume alone, so even if you're a few pounds overweighted here, you can start to ascend just by taking a deep breath.
Anything additional lift capacity you have (whatever your wing is weighted for) is just icing on the cake in this scenario, and some people will simply dive a similar config without a wing (not that I'm recommending that).
Note that at the BEGINNING of the dive, the 6lb worth of air in the tank makes you about 8 to 10lb NEGATIVE net, so in the event of a catastrophic wing failure, you'll need to be able to swim this up to the surface and stay there for a while (most people can) while you get out of your gear to establish positive buoyancy.