What size pony tank for 130'?

[rongoodman]

Just sling a 40 and be done with it.

 

[VikingDives]

Solo or buddy dive? RMV? Dive Plan? Gin or Vodka? Shaken or stirred?

 

[scubadada]

Hi @SlyStrat

This topic has been discussed many times on SB. Do your own calculation using your average RMV. A commonly used calculation is a minute at depth, a normal ascent (say 30 ft per minute to be conservative), and a 3 min SS, all at twice your avg RMV.

My avg RMV is 0.36 cu ft /min. For an ascent from 130 ft, my gas use is 16 cu ft. For a no stop dive, the ascent could safely be a bit quicker and the SS could be skipped. I sling a 19. I dive solo, I'm rarely at 130 feet.

 

[VikingDives]

@Johnoly There's nothing wrong with saying, "I don't know" or asking for pointers to how to figure this out, but like @scubadada said, the information's here already. If you can't figure something out or don't know the right question to ask about what's been posted, PM me or ask here.

 

[rhwestfall]

at 130' I'm using doubles....

 

[Johnoly]

@Johnoly There's nothing wrong with saying, "I don't know"

Everyone dives differently. At 130 deep some are working hard pulling a fish out from under a rock. Others can't see more than 15ft and are moving at a snail's pace. But 130 on 2 or 3 repeat dives is very unforgiving. In my case for Jupiter diving, I'll take a 50% o2 mix. I can easily get from 130 up to 70 and start washing out that nasty N2 stuff or switch from a broken reg/valve. A pony tank of air is not Jupiter 'productive' for multi-drop 130 feets.
But like I said >>>>>Everyone dives differently and no single configuration is good for every diver or even every dive.

 

[Marie13]

at 130' I'm using doubles....

I’ve done multiple 120-130ft Great Lakes shipwreck dives. I always slung a 40.