Most Common Doubles

[O-ring]

I gotta go with Curt on this one. I would use double 80s, esp. if you are diving wet.

 

[Doc Intrepid]

I agree with Curt and O-ring. If you're diving in a wetsuit, there aren't many better choices than sets of double 80s. You can hump heavier tanks, but at the depths you're planning for, ask yourself "why would I want to?"

 

[Rick Murchison]

Make mine a third vote for AL 80's when diving wet. Or 72's... 72's are probably even better - not too negative and not too big or heavy and plenty of gas for no-stop diving.
Rick

 

[rescuediver009]

I agree with Curt and O-ring. If you're diving in a wetsuit, there aren't many better choices than sets of double 80s. You can hump heavier tanks, but at the depths you're planning for, ask yourself "why would I want to?"

What type of wetsuit are you using? Because with my 7mm I know that double AL80s would be the worst choice.... this may work for thinner suits though

 

[O-ring]

What type of wetsuit are you using? Because with my 7mm I know that double AL80s would be the worst choice.... this may work for thinner suits though

Hmm.. How much weight would you require with double 80s in your 7? I guess I am not clear why it would be a bad choice in this case.

 

[fdog]

My usual wetsuit is a 7mm Henderson semi-dry (yes, I know, I'm a wimp when it comes to cold).

With E7-100's, I carry 12 lbs of lead with a X-Long SS plate. This places me about a pound or two negative at the surface with a couple hundred psi.

I like that my lead is pretty close to the gas load. Although I use dual bladders, it's nice to have a third option.

If I was diving Al 80's I feel as if I'd have to add roughly 10 pounds of lead to my current load to hit my target of surface/empty/neutral. No thanks.

The true irony is that it's usually a PITA to get gas fills that make it to "full" on the E7's, so they usually are "80's" because of the short pressures.

All the best, James

 

[jgarysmith]

Thanks for all the great advice from everyone. Seems like 100's or 80's seem like the best choices. I guess maybe I left out that I am trying to get 2 dives in on each trip. That is why I thought 80's might not get me 2 dive nco limit dives. I would on the first,but would have to cut my 2nd dive short until I get my breathing better.My wet siut is a semi dry Mare. I guess I will keep my E8 119 for single deep dives and go with the 80's or 100's for a set of doubles.

 

[rescuediver009]

Hmm.. How much weight would you require with double 80s in your 7? I guess I am not clear why it would be a bad choice in this case.

With a 7mm two piece for the mighty coldI would be about 24 pounds with a single aluminum. Add another and you would have to account for the extra positive buoyancy at the end which would be about 3-4lbs.

Fdog, your XL plate only gives you 2 lbs? are you sure this is SS.Most SS plates, ie- OMS are at least 6lbs. neg. I would assume the XL is only more negative.

 

[fdog]

It's an Extra-long stainless steel FredT plate. It certainly heavier than the Aluminum Extra-long FredT plate that I also use.

When freediving, 26 lbs is neutral with this 7mm Semi-dry. I'm 6'2''.

All the best, James

 

[pescador775]

Double 100's
Good for non deco diving? I love it, HAHAHAHAHAH Good gracious, what the heck is goiing on out there?