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Scuba Forum / General / July 2004% of Air for BCD?
What percentage of air in a scuba tank goes toward the BCD during a typical dive? Is it a large and noticeable amount or small? Under 10%? More? Again, just wondering! > What percentage of air in a scuba tank goes toward the BCD during a >typical dive? Is it a large and noticeable amount or small? Under 10%? >More? Again, just wondering! A cubic foot of water weighs 64 pounds. How much lift does your BC provide?  Signaturedillon When I was a kid, I thought the angel's name was Hark and the horse's name was Bob. > > What percentage of air in a scuba tank goes toward the BCD during a > >typical dive? Is it a large and noticeable amount or small? Under 10%? > >More? Again, just wondering! > > > A cubic foot of water weighs 64 pounds. How much lift does your BC > provide? That's a good way to look at it by Archimedes principle. Normally you only need a few pounds of lift so the amount of air used in a dive should be negligible. Adam "Adam Helberg" <sendspamhere@yahoo.com> wrote in message news:Sd0Nc.14508 > That's a good way to look at it by Archimedes principle. Normally you only need a few > pounds of lift so the amount of air used in a dive should be negligible. Actually it's a completly useless way to look at it. It doesn't take into account several factors including how much of that capacity the diver will need to use, at what depth he will fill it, and how often he will dump and refill it. "Dillon Pyron" <dmpyronINVALID@austin.rr.com> wrote in message n > A cubic foot of water weighs 64 pounds. How much lift does your BC > provide? Not where I go diving it doesn't. >"Dillon Pyron" <dmpyronINVALID@austin.rr.com> wrote in message n >> A cubic foot of water weighs 64 pounds. How much lift does your BC >> provide? > >Not where I go diving it doesn't. Okay, seawater. For the more literate among us, a liter of water weighs a kilogram. Signaturedillon When I was a kid, I thought the angel's name was Hark and the horse's name was Bob. >>"Dillon Pyron" <dmpyronINVALID@austin.rr.com> wrote in message n >>> A cubic foot of water weighs 64 pounds. How much lift does your BC [quoted text clipped - 5 lines] > > For the more literate among us, a liter of water weighs a kilogram. Sheeeeeit. Now I have to get out the books so I can convert liters and kilograms to something that makes sense. A pint's a pound the world around. > >"Dillon Pyron" <dmpyronINVALID@austin.rr.com> wrote in message n > >> A cubic foot of water weighs 64 pounds. How much lift does your BC [quoted text clipped - 5 lines] > > For the more literate among us, a liter of water weighs a kilogram. Go back to Canada, you Commie! ;-> > > >"Dillon Pyron" <dmpyronINVALID@austin.rr.com> wrote in message n > > >> A cubic foot of water weighs 64 pounds. How much lift does your BC [quoted text clipped - 5 lines] > > > > For the more literate among us, a liter of water weighs a kilogram. for the less literate, a system where 1 liter = 1 kilo: a system for the math challenged. > Go back to Canada, you Commie! > > ;-> >> >"Dillon Pyron" <dmpyronINVALID@austin.rr.com> wrote in message n >> >> A cubic foot of water weighs 64 pounds. How much lift does your BC [quoted text clipped - 9 lines] > >;-> Can I take my guns (and high cap mags and hollowpoints)? Signaturedillon When I was a kid, I thought the angel's name was Hark and the horse's name was Bob. Your first dive? 30% Once you figure your bouyancy out? 0.01% > What percentage of air in a scuba tank goes toward the BCD during a > typical dive? Is it a large and noticeable amount or small? Under 10%? > More? Again, just wondering! > What percentage of air in a scuba tank goes toward the BCD during a > typical dive? Is it a large and noticeable amount or small? Under 10%? > More? Again, just wondering! no telling. I don't use any - I use the air that I have breathed in. >> What percentage of air in a scuba tank goes toward the BCD during a >> typical dive? Is it a large and noticeable amount or small? Under 10%? >> More? Again, just wondering! > > no telling. I don't use any - I use the air that I have breathed in. That's cheating. > What percentage of air in a scuba tank goes toward the BCD during a > typical dive? Is it a large and noticeable amount or small? Under 10%? > More? Again, just wondering! I have an 18 pint BCD which I partially (1/2)inflate at the beginning of the dive (when I'm heaviest) at, typically, 3.5 atm, therefore using about 32 pints. If I have a wait at the surface for the boat, I will inflate it again, at 1 atm, anothe 18 pints. So max used is, say, 50 pints. I dive with steel 100s at 10% over, about 6,580 pints. 50/6580 = 0.8% Over weighted folks with smaller tanks might use as much as 4% - 5% > What percentage of air in a scuba tank goes toward the BCD during a >typical dive? Is it a large and noticeable amount or small? Under 10%? >More? Again, just wondering! Insignificant. The actual amount will vary depending on the profile. A purely square or gradually climbing profile will theoretically require one partial inflation (like, maybe one or two breaths), while a dive with a lot of ups and downs will need slightly more. --- Rich http://richlockyer.tripod.com/ |
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