fbk
Contributor
+1 on just hiring a tank, or getting to use a nearly empty one for free. You should do your weight check at safety stop depth anyway. Doing it on the surface in a pool with no tank or no regs... is guesswork at best.
Weight check w/o tank
- Thread starter sbl212
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unless you are me, and weigh 330#, in Thailand, I needed 8kg with no exposure suit and a big steel tank...
I vote just check it quickly next time you rent a tank
Spend enough time teaching and that first line becomes highly suspect. Training no wetsuit people, in the exact same gear, with similar builds, who need weight from zero to 12 lbs, has shown me this is just not the case at all.
If it were, setting up training gear would be so much simpler.
Ya, maybe I should try teaching sometime.........
Please note "average" build.....yes there are exceptions, the body size relative to bouyancy is more related to the amount of neoprene. When I teach scuba makeover program, we are in the pool in bathing suits perfecting breathing. The difference between a 110lbs woman and 250 lb. man (me) is usually about 4 lbs. Every class is video taped.
I find breathing is a very big factor, and sadly many instructors that are crunched for time just slap on extra weight vs really addressing breathing/buoyancy first.
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Please note "average" build.....yes there are exceptions, the body size relative to bouyancy is more related to the amount of neoprene. When I teach scuba makeover program, we are in the pool in bathing suits perfecting breathing. The difference between a 110lbs woman and 250 lb. man (me) is usually about 4 lbs. Every class is video taped.
I find breathing is a very big factor, and sadly many instructors that are crunched for time just slap on extra weight vs really addressing breathing/buoyancy first.
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Last edited:
GrumpyOldGuy
Contributor
Another issue is the difference of density from salt to fresh water. While in the pool, the ballast requirements for the 110lb vs 250 diver may be just 4lbs, but when you add the 2.5% of TOTAL WEIGHT of the diver+gear to compensate for salt water, you gain another 3.5lbs for 7.5lbs
Top that off with the sad fact that the density of muscle is 1.06 g/ml, fat is about 0.9 g/ml (pure water is 1 g/ml by definition). This make a significant difference for some larger guys who carry a pony keg instead of a 6pack.
Top that off with the sad fact that the density of muscle is 1.06 g/ml, fat is about 0.9 g/ml (pure water is 1 g/ml by definition). This make a significant difference for some larger guys who carry a pony keg instead of a 6pack.
Tony387
Contributor
Yes, water isn't the controlling factor in buoyancy any more than your body weight is...its the fat. 
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