Doubles Weighting Question

[limeyx]

Well, I use the DUI 400 gm undies and I still don't need any weight in fresh. In salt, my brand new dui 400 gm might need a couple of lbs.

then you have bones of steel my friend (at least compared to me)

In fresh, with 400G I need a steel plate and at least 6 pounds on the belt, probably a little more for neutral or slightly negative tanks.

 

[JeffG]

then you have bones of steel my friend (at least compared to me)

In fresh, with 400G I need a steel plate and at least 6 pounds on the belt, probably a little more for neutral or slightly negative tanks.

It all boils down to tanks. My 130's empty are neutral. So add in Al plate, bands, manifold, tail weight (~6 lbs), Can light, regs its enough to sink my drysuit and my undies.

With my Al 80's I add a 12 lb belt.

My body is slightly negative being a tall skinny guy with rocks in my head.

 

[dschulte]

Just got my set of steel doubles and can't wait to jump in with them. Actually doing my first dive this weekend. I've been diving a while with a SS backplate and P weight with a single (80 cf) aluminum tank. Hope to take some tech diving instruction this late fall or winter, so I need to get used to the doubles. How much weight can I expect to use compared to my single tank set-up (ie: should expect more weight/less weight,...).

Thanks,

I have been diving a steel backplate with a single 100 steel tank. In a 7mm suit, I use no weight. With the independent twin setup, two 100 steel tanks, I am 10lbs negative at the start of the dive.

 

[mddolson]

All tanks loose weight, and become less negative as the gas is consummed.
Ultimately you need to be able to trim yourself neutral at any depth.
Set yourself neutral at the surface with near empty tanks( ie 200-300 psi).
Filling the tanks adds weight which you compensate for with your wing.

I am a big guy (250lbs),with my drysuit, aluminum backplate ,
I wear 12 lbs with my twin 98 steels.
and 24 lbs, with a single 80.


Mike D

Just got my set of steel doubles and can't wait to jump in with them. Actually doing my first dive this weekend. I've been diving a while with a SS backplate and P weight with a single (80 cf) aluminum tank. Hope to take some tech diving instruction this late fall or winter, so I need to get used to the doubles. How much weight can I expect to use compared to my single tank set-up (ie: should expect more weight/less weight,...).

Thanks,

 

[rjack321]

then you have bones of steel my friend (at least compared to me)

In fresh, with 400G I need a steel plate and at least 6 pounds on the belt, probably a little more for neutral or slightly negative tanks.

I'm weighting about like limeyx - Jeff's got lead hidden on him somewhere

 

[TSandM]

I'm diving doubled steel 72s, and I took four pounds off compared with my single 95s.

 

[dsteding]

I dropped 12 pounds when I went from single 119s to double 119s, and at 500 psi in the tanks I can hold a 10 foot stop.

 

[JeffG]

I'm weighting about like limeyx - Jeff's got lead hidden on him somewhere

You will have to ask CIBDiving about that.

 

[Sawllkwa]

I’ve done 6 dives since I first posted this question. I wasn't sure of the weight needed with the new twin 80 cf steels. Got alot of great advice from this thread, but also wanted to play with it. Did my first dive a bit (grossly) over-weighted. I actually added weight from my single tank configuration and threw 16 kg (35 lbs) on my belt. Sunk like a rock. The weight and wing inflation actually made it hard to see my gauge. Over the next few dives dropped it down to 8 kg (17 lbs). Might come down further as I get my buoyancy with the twins under control. I was a bit surprised that the new weezle extreme didn't seem to affect the weight too much. The water is actually warmer than I was used to in Vancouver, but they say it'll be alot colder in the winter.


This is an awesome board, and thanks for all the advice.

 

[scuberd]

I wonder about having ditchable weights? if you can dive without a weightbelt, how could you ditch those weights in an emergency to establish postitve bouyancy?

I havn't yet used doubles and this is my last intellectual stumbling block before I do.