twins....

[JohnK]

I am looking to upgrade to a 12 liter twinset, ss bands and MDE manifold. I currently dive with a single 12 and 3 liter pony and carry 12kg of lead using a DiveRite Trek wing. The wing has 18kg of lift.

OK - I am sure these questions have been asked before, but here goes again:

1.  Will the Trek wink be big enough for the twins in terms of lift (other kit config will be the same and I will only be diving twins in a drysuit)

2. Will I be able to lose some of the lead (more tank weight therefore less lead ??)

Your comments/help would be appreciated - thanks

[Scuba1]

Hi kirky
1)  
I take it you are going to use steeltankas and if so the Jacket is abit on the small side as far as lift goes. I have a Jacket with 22 Kg lift and it is only stated for 10 liter twins. You cant take the lift of the drysuit in to acount because if you do end up with a failure of your suit the jacket will ave to tke it all.

2)
Find out if the tanks float when they are emty as some do in witch case you will have to add weight and not lose some.
in any case do a weightcheck with allmost emty tanks to stop unwanted surprises.

Dive safe
Michael

[Davey Willo]

kirky, a guy I know is selling a set of banded, manifolded twin 12's cheap, plus a wing/bp/ etc... email me for more details if you are interested
regards
Dave.

[JohnK]

Thanks for the info folks. Just out of interest - for those of you that dive 12L twins, which Wing/how much lift do you use??

Thanks again

[andy2tanx]

Buddy Tekwing, although I will soon be changing to a Dive Rite classic.  Nuff said!!

[Dominic]

To know the difference in weight underwater for various cylinders, go to http://www.oneandoneis2.demon.co.uk/DiveWeb/cylbuoy.xls for an Excel calculator
(Plug plug ;))

The absolute minimum lift a BCD must supply is the weight of air the cylinders can contain - since being correctly weighted means being neutral with empty cylinders with no air in the BCD. Extra buoyancy is for things like mouth above water, excess kit, excess lead to keep you warm, etc.

A 12L cylinder holds about 3.5kg of air, so the absolute minimum lift you need is 7kg - so you have 11kg surplus lift to use as you see fit

[twinset trev]

I use custom divers wing 66 lbs lift
plenty of lift even with 7 ltr sidesling

[Jay]

OMS single bladder with 55lbs lift. No probs with twin 12s.

[JohnK]

Dave - please post/send details of the twinset that is up for grabs

Cheers

[Davey Willo]

Sorry kirky it's gone