What's your TBT on a AL80?

[Antagonist]

This weekend I went diving with a AL80 and I had a bottom time of 1:22 minutes, my longest time so far. I hate that my wife dives with a 63 and our air always match. Damn her little lungs!!! (She is Japanese)

What bottom times are other people getting? I am diving with a HOG regulator and a HOG D1 first stage. (which is amazing, I love it)

 

[elan]

I get around half an hour at 60 ft with 1000psi rock bottom (about 35-40 min with surfacing) Or 50-60 min at 20 ft on a reef.
25 mins at a 100 when used as a stage down to 200-300psi

 

[Antagonist]

Our average depth was 34 ft.

 

[dkktsunami]

Depth might have a little to do with this .............

 

[BKP]

I get similar times to elan with an AL80... a flat profile at 34 feet on a reef with little/no current perhaps about 50 min. w/ 500psi left (my wife dives a 63 also, and usually has more air left than I do). Not the best... not the worst.

That being said, l dive an HP100 (better buoyancy, better bottom time).

 

[Cave Diver]

Varies with depth and workload...

 

[Rhone Man]

When I did a (fairly tiring) search and recovery dive on a flat bottom at 62 feet, I got almost exactly an hour out of my Al 80, but I flat drained the tank.

I was always quite glad of the experience, because it gave me a good ready reckoning of my high activity level level air consumption, which I find easier to work with underwater than laboriously going through SAC calculations:

• Al 80 gives me 60 minutes at 3 atm (approx 66 feet) - or 10 minutes per 500 PSI, so
• Al 80 would give me 1.5 hours at 2 atm (approx 33 feet) - or 15 minutes per 500 PSI, and
• Al 80 would give me 45 mins at 4 atm (99 odd feet) - or 7.5 minutes per 500 PSI.

The most encouraging part is that if I ever find myself needing to do emergency deco, I know that even just 500 PSI will last me at least 20 minutes at 15 feet (and usually much longer if I can stay at rest), which should cover me for about as much stupidity as I can manage get myself into with just 80 cubic feet.

 

[danvolker]

My wife Sandra gets between 3.5 and 4 hours at the Blue Heron Bridge Marine Park each time she dives there, doing macro photography. Depth is between 8 and 18 feet, most around 12 feet deep--this with al 80.
On the 60 to 80 foot reefs, the boat limitation of an hour per dive is always her limiting factor.

 

[qwerty988]

I think the better measurement would be of yourself and your SAC rate average. If you are improving your SAC rate average, then you are improving your air usage. My average is 34 psi/min at 50ft. However, I did a performance bouancy checkup this weekend at 20 feet and cranked off a 17.7psi/min over 40 minutes. Didn't do anything but hover and run through equipment and safety checks. Activity and depth have a huge impact on your consumption.

 

[fdog]

Varies with depth and workload...

I was pretty proud a couple of weeks ago - I managed to get 27 minutes out of a full Al 80 of 21/35. Working backwards it was a RMV of 0.45 or thereabouts.


All the best, James