I feel kinda stupid since this should be easy, but I just want to make sure I understand all this properly.
If I get in the pool with nothing but a swimsuit and float, I could add weight until I was neutral at the surface (my eyes at water level). Lets say that is 9lb. This weight no matter what depth will not change at least not enough to matter I assume. Sound right so far?
Now I have my BPW which has a 12lb plate (custom... I know they don't normally come this big), 2lb regs and a 10lb tank full. So around 24lb of negative buoyancy. At the end of my dive my tank will weigh around 2lb. I need to compensate for this loss but I will get to that a bit later. Still sound right so far?
Next is the exposure suit. Lets say my 3mm is buoyant by 11lb. Now as I go deeper air is squeezed out of it and it looses buoyancy. I assume we plan for 0 buoyancy from the wetsuit in the worst case scenario. I also have to make sure my BPW is heavier than my wetsuit so it can sink me. If it is lighter, I need to add the difference between the buoyancy of the exposure suit and the BPW to the weight system. Hopefully I am still on track.
In the above scenario, I am on the surface 20lb positive (9lb for me and 11lb for the wetsuit). My BPW is 24lb in the beginning but will be around 16lb at the end of the dive due to air loss. I should add at least 4lb to a weight system to compensate (20lb of potential buoyancy - 16lb for the BPW at the end of the dive). Correct?
Now my wing size should be at least 28lb (24lb for a fully aired BPW and 4lb for compensation weight) plus enough to comfortably lift my head out of the water at surface say around 7lb. Meaning a 35lb wing minimum with a couple pounds to spare would be appropriate. I don't think this is right, but not sure where I went off the logic rails.
If I get in the pool with nothing but a swimsuit and float, I could add weight until I was neutral at the surface (my eyes at water level). Lets say that is 9lb. This weight no matter what depth will not change at least not enough to matter I assume. Sound right so far?
Now I have my BPW which has a 12lb plate (custom... I know they don't normally come this big), 2lb regs and a 10lb tank full. So around 24lb of negative buoyancy. At the end of my dive my tank will weigh around 2lb. I need to compensate for this loss but I will get to that a bit later. Still sound right so far?
Next is the exposure suit. Lets say my 3mm is buoyant by 11lb. Now as I go deeper air is squeezed out of it and it looses buoyancy. I assume we plan for 0 buoyancy from the wetsuit in the worst case scenario. I also have to make sure my BPW is heavier than my wetsuit so it can sink me. If it is lighter, I need to add the difference between the buoyancy of the exposure suit and the BPW to the weight system. Hopefully I am still on track.
In the above scenario, I am on the surface 20lb positive (9lb for me and 11lb for the wetsuit). My BPW is 24lb in the beginning but will be around 16lb at the end of the dive due to air loss. I should add at least 4lb to a weight system to compensate (20lb of potential buoyancy - 16lb for the BPW at the end of the dive). Correct?
Now my wing size should be at least 28lb (24lb for a fully aired BPW and 4lb for compensation weight) plus enough to comfortably lift my head out of the water at surface say around 7lb. Meaning a 35lb wing minimum with a couple pounds to spare would be appropriate. I don't think this is right, but not sure where I went off the logic rails.