Halcyon products confusion

[cool_hardware52]

I mean that if my backplate, tank, etc are 15lb negative and I need 10lb(not 25)lead more to sink my undergarment, the whole rig becomes 25lb negative, thus the wing should be 25 or more.( As i understand the situation).
And why do you take into account only 15lb (without 10lb lead, which is supposed to be placed in the weight pockets on the harness)?

At the end of the dive you need enough ballast to offset the buoyancy of your suit (assuming you are close to neutral yourself)

For this calculation you need to use the empty buoyancy of your tank + plate, + harness + regs + lead.

To determine the minimum wing size you should use the large of:

The buoyancy required to float your rig at the surface with a full tank, if your ditch it

&

The max buoyancy your suit could lose, i.e. compression of a wetsuit, or total failure of a dry suit.

Tobin

 

[PerroneFord]

I mean that if my backplate, tank, etc are 15lb negative and I need 10lb(not 25)lead more to sink my undergarment, the whole rig becomes 25lb negative, thus the wing should be 25 or more.( As i understand the situation).

If all your gear was 25# negative (no weight belt), and your undergarment needed 25# to sink it, you PLUS your gear will be neutral in the water. If you were to become seperated from your gear, you would become 25# positive, and your gear would be 25# negative.

If your gear is 15# negative, and you wear 10# of lead, and you became separated from your gear, you would be 15# positive, and your gear would be still be 15# negative.

So what scenario do you envision, where your wing would need to support 25#??

And why do you take into account only 15lb (without 10lb lead, which is supposed to be placed in the weight pockets on the harness)?

What harness?

 

[vioch]

The buoyancy required to float your rig at the surface with a full tank, if your ditch it

Tobin

Just specifying: does the rig assume plate, + harness + regs + lead ?

 

[vioch]

What harness?

Basic harness.
Okay. I finally understand, that the separate wight belt was assumed.

 

[vioch]

Okay. I finally understand, that the separate wight belt was assumed.

 

[PerroneFord]

A basic harness doesn't have pockets for weight. So what harness are you talking about?

 

[vioch]

A basic harness doesn't have pockets for weight. So what harness are you talking about?

I mean pockets like these:

 

[cool_hardware52]

Just specifying: does the rig assume plate, + harness + regs + lead ?

If you are using a belt, worn on your person, the wing will not need to float it if you ditch your gear.

OTOH, if you add ballast to your rig, via pockets, "P weights", bolt on weight plates, more negative steel tank (104 vs a 108 for example) then the wing will need to float it at the surface.

Tobin

 

[vioch]

Thanks to PerroneFord and Tobin . Everything is clear now.