Bcd lift capacity

[Cute Teddy]

ok folks here id my rig,

3mm Full Length Suit
15l Steel Tank
SMB & Finger Spool
Legend LX Reg & Octo
Dive light PCa
5.7l Pony Mounted To The Tank

i dive OW recriational depth (40m)in tropical to temperate water..Im 5-7" & 90kg

I want to buy a BCD what lift capacity would i be needing...????????????

 

[jcfahy]

http://admin.minus-mp3.com/Bouyancy_calculator.xls

Try this link from SB on the ultimate buoyancy calculator. you can do your own calculation

 

[Cute Teddy]

http://admin.minus-mp3.com/Bouyancy_calculator.xls

Try this link from SB on the ultimate buoyancy calculator. you can do your own calculation

can you pls help me with this....how to calculate suit buoyancy.

where to enter the pony bottle details..

 

[vinegarbiscuit]

You can look up the buoyancy characteristics of your pony bottle and add them to the list of tanks listed on the bottom of the spreadsheet. Scuba Cylinder Specification Chart from Huron Scuba, Ann Arbor Michigan Then you can choose the buoyancy characteristics of both your back gas and the pony when inputting all the variables needed to perform the calculation.

 

[aquaregia]

can you pls help me with this....how to calculate suit buoyancy.

There's a bunch of rules of thumb, or you can toss the suit in a bucket of water and throw lead at it until it sinks. My 7mm is 18# and my 3/2mm is 8#, using the bucket method.

 

[Cute Teddy]

ok thanks for the replys guys but

what shall i put in the field BP i am using jacket style BcD...

 

[ItsBruce]

When I went through the "how much lift do I need" issue, I was told that I need enough lift to get me off of the bottom. That means, to assume the wetsuit is fully compressed and offering no buoyancy and that all buoyancy must be provided by the bcd. So, the question is how much lead do I need to submerge at all. I needed 22 pounds of lead. So, if I have 22 pounds of lead, with no buoyancy from my wetsuit (i.e. it is fully compressed), 23 pounds of lift makes me positive. And, once some air is used and once the wetsuit decompresses, I'm even more buoyant. Of course, I went with a bit more than 23 pounds because I wanted to be able to be able to change my configuration without needing a new wing.

 

[halocline]

ok folks here id my rig,

3mm Full Length Suit
15l Steel Tank
SMB & Finger Spool
Legend LX Reg & Octo
Dive light PCa
5.7l Pony Mounted To The Tank

i dive OW recriational depth (40m)in tropical to temperate water..Im 5-7" & 90kg

I want to buy a BCD what lift capacity would i be needing...????????????

You need enough lift to compensate for the loss of buoyancy in your wetsuit plus the weight of the gas in your tank, or enough to float your rig without you in it, whichever of those two is greater.

 

[vinegarbiscuit]

ok thanks for the replys guys but

what shall i put in the field BP i am using jacket style BcD...

Best way to verify the buoyancy of the BCD is to test it. If you have a pool or confined body of water available, put the BCD in the water - secure it, if you can, so it doesn't drift off - make sure there's no air in the wing, and start adding weight to it until it sinks. You can even put your BC and wetsuit in a mesh bag and start adding weight to the top to see the combined buoyancy of your BC and wetsuit. However much weight you used to make the suckers sink = your input value.