Charlie99
Contributor
- Messages
- 7,966
- Reaction score
- 166
- # of dives
- 500 - 999
2.5% of TOTAL weight -- you, your tank, and all your gear, including any lead you need for proper weighting.Crazy Fingers:Adding 2.5% of weight is the total wrong way to do it. In freshwater with a 3 mil I need roughly 10 pounds of weight. That doesn't meant that in salt water I need 10.25 pounds!!
63.95/62.293 = 1.0266, or seawater is about 2.66% more dense than fresh for the temps you chose.Saltwater at 80 degrees (ocean) = 63.950 lb/cuft
-Freshwater at 70 degrees (spring water) = 62.293 lb/cuft
--------------------------------------------------------
If you are properly weighted, at the end of a dive you+tank+gear+lead are the same density as the water. A more accurate way to measure your volume is to simply weigh all of you + all of your gear and divide by the weight per cubic feet. Now that you know your volume, you can do your calculations more accurately. Or you can just skip converting to volume and back and apply the correction directly to your TOTAL weight.Crazy Fingers:Multiply that times your body's displacement and your gear's displacement to get your overall figure. If you want to know that, fill your bathtub up with some cool water, enough to cover you completely when you submerge. Put a line there with a pencil. Then get in with all your gear and try to get as much of your body and gear in the water as you can. Put another mark where the water goes to. The area (sqft) x the length (ft) is the volume you occupy.