Weighting

[Twoblues]

A question for a dive master: I replaced my bc with an apparently much heavier back inflate Oceanic w.i. Excursion two
bc. My question is : does every item we carry down and back add to or subtract from our buoyancy weighting? Mike

 

[decompression]

Google "balanced rig" by Andy Davis, has some very good points.


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[TSandM]

Well, everything we carry contributes to our net tendency to sink or be buoyant. But what something weighs on land is not what it weighs in the water; there are things that are heavy to carry on land but have little negative contribution at all (like aluminum tanks). The only way to be sure of what an equipment change has done for your total weighting is to do a weight check IN the water.

 

[Bopper]

My question is : does every item we carry down and back add to or subtract from our buoyancy weighting? Mike

Depends on whether or not the weight of the item is more or less than the equivalent amt of water it displaces.

Disclosure: I am not a dive master

 

[Twoblues]

Thank You for the balanced rig website, Decompression.

 

[fnfalman]

A question for a dive master: I replaced my bc with an apparently much heavier back inflate Oceanic w.i. Excursion two
bc.

As others already said, weight on land means nothing. Its characteristics in water (positively buoyant or negatively buoyant, and by how much either way) is important.

My question is : does every item we carry down and back add to or subtract from our buoyancy weighting? Mike

Yes. If you're carrying a big ass can light that weighs a few pounds, then it definitely affects your weighting. Or harvest about 5-scallops with shell.

 

[salth2owannabe]

I had used my "cold water" BCD for travel and warm salt water diving and I needed 14 lbs. of weight. I have since bought a travel BCD which weighs less than half that of my other BCD. I needed 12 lbs. with it (everything else identical) and probably could have gotten by with 10 lbs. just fine.

 

[Steve_C]

Keep in mind that some things lose weight or could get lost or could get left during the dive. For example, my pony is negative. However if I were to use the air or pass it off to someone who was OA, then the weight would be gone. So I do not reduce my added weight when I dive with it.