Halcyon products confusion

[dbulmer]

So tell me how you would rescue an unsconcious diver in warm water?

 

[JeffG]

So tell me how you would rescue an unsconcious diver in warm water?

You use his BC

 

[vioch]

If we assume that you need 25 pounds to sink your undergarment, and your gear is 10 pounds negative while full of air, then you'd need 15 more pounds with full tanks, and then you add what is necessary to offset the weight of the air in your tank. In this case the wing would need to be able to support 15 pounds (plus a bit for a safety margin).

Sorry, didn't catch - why the wing "would need to be able to support 15 pounds" if the whole rig should be 25pounds(to sink the undergarment)?

 

[dbulmer]

PF, JeffG

Yes I'm thinking the same (but didn't manage to say it) - my point is that if I have a problem in 40lb wing my buddy in a twinset can find it slightly easier to lift me with my 40lb wing than a 30lb. I should have stated this clearly but didn't.

The other reason for having a little extra lift comes when the sea is rolling a bit - the extra bit of lift is a bit more comfy in sea conditions that have changed since the start of the dive.

 

[dbulmer]

Vioch,
I think 15 lbs might be weight of 2 tanks filled with air rather than a single tank but maybe PF can confirm that?

 

[riguerin]

Could anybody(who dives in cold water with a drysuit, thinsulate 400 and steel tank) confirm that 30lb wing is enough?

I dive a 30lb Eclipse on my singles rig. My typical configuration includes a SS BP & weighted STA, TLS350 , 300gm Polartec, and either an X7-100 or X8-130 tank. The only ditchable weight I carry is my can light.

The configuration works just fine in salt water. There's enough lift to float the rig on the surface without me in it ... albeit, it rides noticeably lower with the 130. YMMV

 

[PerroneFord]

Sorry, didn't catch - why the wing "would need to be able to support 15 pounds" if the whole rig should be 25pounds(to sink the undergarment)?

If your undergarment needs 25 pounds to sink, and you wear 25 pounds of lead to sink it, then you'll be overweighted by whatever your gear's negative buoyancy is. If you only wear enough lead to compensate for the difference in buoyancy in what your undergarment needs, and what your gear weighs in water, then you'll be carrying less lead, and your BC won't need to be as large.

If you are diving this configuration, and you need to ditch your weightbelt for whatever reason, my way, you'd be 15 pounds light. Your way, you'd be 25 pounds light. My way, a 30# lift wing would offer nearly a 100% safety margin of lift. Your way, you'd be much closer to the edge.

 

[vioch]

There's enough lift to float the rig on the surface without me in it ... albeit, it rides noticeably lower with the 130. YMMV

Why does it ride noticeably lower with the 130? If you change the tank for heavier one, you have to reduce wight from the belt to make your coniguration balanced again, isn't it?

 

[PerroneFord]

Not everyone needs to wear weight.

 

[vioch]

If your undergarment needs 25 pounds to sink, and you wear 25 pounds of lead to sink it...

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)?