Clammy
Contributor
Hi all,
I haven't had to do this in a few years and honestly I think I've forgotten! I'm setting up a new bp/w for my friend and am trying to calculate the smallest wing I need to get her and it doesn't seem to add up. I also recalculated my rig with my 30lb wing and something isn't right there either. I'm obviously forgetting or missing something.
In MY case I use a 30lb wing on a weighted STA and SS bp. I USUALLY dive dry in an X7 HP100. When dry, I use 8lbs on my waste (which admittedly is probably about 2lbs more than I need) and when wet in a 7mm I use 4lbs though I've gone down with 0lbs on my waste but never tried that at 500 psi on a safety. I carry a can light too but for this purpose I'll say I don't.
Tank full is -10, BP/STA -10, reg -2, ballast for dry -8. That's -30 but I could have sworn when I originally chose a 30lb wing that I had some sort of buffer in the event that my dry suit rips open under water for some reason with a full tank. Okay whatever, I guess it's fine for me and I can swim up or breath big for that extra -2lbs on the can light.
FOR MY FRIEND, she just bought a drysuit so her weighting is unknown until this weekend. She normally dives 22lbs in a 7mm and AL tank in a jacket BC. We are switching her to a drysuit, bp/w, and one of my X7 HP100 tanks. That's a lot of changes.
Anyways, I'm thinking BP/STA -10, full tank -10, reg -2, ballast dry -8-12. She's 5'5", 110-120 normal athletic build. This puts her at 30-32lbs. That means I need to put her in a 32lb wing? For some reason that doesn't seem right. I figured I'd have to put her in a smaller wing, like a 25 or 28.
Of course I understand that just because she's smaller doesn't mean she will use less weight than I do but can someone clear this up for me? You're supposed to have the minimum lift to keep you from dropping like a rock (or be neutral) in the event of catastrophic dry suit failure correct?
I haven't had to do this in a few years and honestly I think I've forgotten! I'm setting up a new bp/w for my friend and am trying to calculate the smallest wing I need to get her and it doesn't seem to add up. I also recalculated my rig with my 30lb wing and something isn't right there either. I'm obviously forgetting or missing something.
In MY case I use a 30lb wing on a weighted STA and SS bp. I USUALLY dive dry in an X7 HP100. When dry, I use 8lbs on my waste (which admittedly is probably about 2lbs more than I need) and when wet in a 7mm I use 4lbs though I've gone down with 0lbs on my waste but never tried that at 500 psi on a safety. I carry a can light too but for this purpose I'll say I don't.
Tank full is -10, BP/STA -10, reg -2, ballast for dry -8. That's -30 but I could have sworn when I originally chose a 30lb wing that I had some sort of buffer in the event that my dry suit rips open under water for some reason with a full tank. Okay whatever, I guess it's fine for me and I can swim up or breath big for that extra -2lbs on the can light.
FOR MY FRIEND, she just bought a drysuit so her weighting is unknown until this weekend. She normally dives 22lbs in a 7mm and AL tank in a jacket BC. We are switching her to a drysuit, bp/w, and one of my X7 HP100 tanks. That's a lot of changes.
Anyways, I'm thinking BP/STA -10, full tank -10, reg -2, ballast dry -8-12. She's 5'5", 110-120 normal athletic build. This puts her at 30-32lbs. That means I need to put her in a 32lb wing? For some reason that doesn't seem right. I figured I'd have to put her in a smaller wing, like a 25 or 28.
Of course I understand that just because she's smaller doesn't mean she will use less weight than I do but can someone clear this up for me? You're supposed to have the minimum lift to keep you from dropping like a rock (or be neutral) in the event of catastrophic dry suit failure correct?
