Help with Doubles

[mick allein III]

I just took the plunge into technical diving and BM doubles. I am having trouble getting balanced. I feel like the tanks are shifting when I dive. How tight should my crotch strap be? Any suggestions to speed the learning curve would be helpful.


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[tbone1004]

crotch strap should be fairly snug, waist should be fairly snug, shoulders should be pretty loose.

How much shifting is shifting?
What tanks are you using?
What exposure protection?
SS or AL plate?
If extra lead, how much and where?
Which wing?

Doubles are extra sensitive to being overweighted as you have to have that much extra air in the wing to compensate for gas. Minimum 12lbs for AL80s, up to 30lbs with 104/108/121's etc. If you are any more overweight than you need to be, the wing becomes that much less stable. Lots of variables we need to know before we can help.

 

[mick allein III]

The shoulders are tight especially the right one. I tilt to that side. Shifting 2 inches. LP 95s SS plate, drysuit. No extra lead.


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[tbone1004]

which wing?

 

[mick allein III]

Dive rite sorry


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[tbone1004]

I'd verify harness fit first, then verify placement of the bottles.
https://www.divegearexpress.com/library/articles/harness-assembly-instructions
DIR-diver.com - Adjust the backplate

 

[AfterDark]

Make sure your band assembly is securely bolted to the back plate. If it's loose the tanks will keep shifting. This will happen even with a single tank. Tighten your shoulder straps 1st then your waist and crotch straps.

 

[tbone1004]

don't tighten your shoulder straps.... the need to be loose to get in and out safely.

 

[WarrenZ]

Don't forget doubles are a lot of weight just in the gas fill there is a lot of mass back there to get used to especially if you are used to a single 80 they will feel different.

 

[mick allein III]

The weight doesn't bother me. It's the imbalance. Floating neutral on a practice deco stop I will roll right. I can shift the tanks and then roll left. I'm thinking there's too much play in my waist and crotch strap.


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---------- Post added October 12th, 2015 at 07:56 PM ----------

Warren you do have a point when I roll to vent my drysuit I feel like someone's on my back


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