How much weight?

[scubajim311]

Ok me and my wife will be diving in a few weeks in monterey with 7 mil wetsuits. we were going to try out some aluminum tanks to see if my wife likes that better. I usually have 27 lbs. my wife uses 22 lbs. and thats with both of us using steel 80's how much weight should we be looking to add? thanks, james

 

[diver 85]

I usually use 5 or 6 lbs less on a 120 steel vs 80 Al, so I would guess 4 more needed?? for an Al 80................

 

[Charlie99]

What type of steel 80? They don't all have the same empty buoyancy.

Scuba Cylinder Specification Chart from Huron Scuba, Ann Arbor Michigan is a list of specs where you can find the empty buoyancy for the tank you have used in the past and compare it to the AL80 you will be using -- 4 or 4.4 pounds positive for the most common AL80 tanks.

Add the negative buoyancy of your steel 80 (anywhere from -1 to -7 pounds) and you have an adjustment of adding 5 pounds of lead to adding 11 pounds of lead, depending upon what type of steel 80 you have been using.

 

[muddiver]

For aluminum 80's and 7 mil neoprene I use the devide your weight by 10 and add 4 lbs. It is usually pretty close for cold sea water diving.

 

[Teamcasa]

I would add 4-5 lbs to compensate for the AL80's. You won't be far off.

 

[scubajim311]

i weigh 200 so if i use the divide by 10 and add 4 i would come up with 24 which is less then what i had with a steel tank and i felt like i didn't have enough weight even then. I'll try 5 lbs. Thanks for all the suggestions.