Weight/Tank question

[SheilaM]

Feel very silly asking this question but ... have recently upgraded to 12L tank from a 10L one. Do I now take off some weight, either from the integrated pouch or my weight belt ? to compensate for the heavier tank. Advice needed ! and thanks.

[recurve]

Probably very little weight change will be required going from 10 to 12 Litre. The extra weight of the tank is pretty much offset by the increased buoyancy as it is displacing more water.

There are calculators on t'internet that will work it out for you, but after a major computer crash, I have lost all my bookmarks

[edit]

try here

http://www.frogkick.dk/tools/tankbuoy.asp

[/edit]

[markw]

Here's another cylinder buoyancy calculator, with a list of common cylinders

http://www.subaqua.co.uk/cgi-bin/cylinder-buoyancy.cgi

[Freeflow]

I feel 'lighter' diving a 15 than I do a 12, and lighter in a 12 than a 10, so I actually take weight off for a smaller tank.

Just jump in with your 12, see if you sink, if you don't have someone pass you a kilo or two.

Remember that you will have more gas in the 12, so the weight change will be more pronounced between full and empty. When I dive new kit I jump in with my tank at 50 bar and make sure I can hold a stop at 5m comfortably with air in my suit [needed for the warmth]. Then I get out and make everyone wait while I get a fill.