help with weight

[m.fox]

hi all

i did a weight check in the pool the other day and could do with a bit of advice, i wear a 5mm compressed neoprene suit, a 100g thermocline undersuit(cause i get cold) and twin 12ls. now with my twins down to 30 bar i needed 24lbs(10.9kg) of weight. now the advice i need is, when my twins are full will i need the same weight or less.

[tom]

You'll need the same weight because you have to plan for the worst case scenario - having to maintain neutral buoyancy on a stop with a nearly empty twinset.

[FOX]

You should base your weight on empty cylinders (30 should be ok) as you have done (you'll need to be able to hold a stop at the end of a dive), you'l find that it'll vary slightly from fresh water to the salty stuff

[Al_Star]

You should have the same weight. You need to be able to keep your stop at the end of the dive when you are running out of gas (worst case scenario). You don't want to find yourself underweight and pop to the surface.

Might be worth looking at a V-weight or stainless steel backplate to try and remove some of the weight off your belt

Cheers
Al

[Woz]

At the beginning of the dive you'll have over a stone of air in your cyls which won't be there at the end. So yes, plan to weight with nearly empty cyls. Otherwise you'll head north at the end of a dive when you really don't want to.

[tom]

Originally Posted by FOX

it'll vary slightly from fresh water to the salty stuff

Varies by about 3kg for me

[m.fox]

would it vary alot if i didnt have such a bulky undersuit

[Simon Lamb]

Can I just ask, why are you worried about the weight?

It takes what it takes IMHO.....


Si

[Conor]

if you are talking about the variation from salt to fresh etc then yes, it would vary a lot because it is the whole volume of you and you git that would need to have its average density corrected, so the undersuit wouldn't make so much difference to the amount of extra lead you would need to add.

If you mean how much lead is needed as you change undersuit then this can be significant, for me adding a thermocline artic added about 2kg

[Al_Star]

The change from full to empty cylinders won't change, but the buoyancy of your drysuit will alter dependent on how bulky you are (i.e. you'll displace more water). A thinner undersuit should mean you didn't need as much weight - but you'd need to do your 30 bar check in the pool again to find out how much.

Maybe you're just a naturally buoyant n