Got Air? Who Sips the Least?

[IncreaseMyT]

Ok looking to hear the lowest amount of air you have used or have seen someone use on an under 40 ft dive with an AL 80 thats your standard charter boat hour time limit?

One of my DM's is a female in her late 30's and uses less than 700# on an hour long dive at 30 feet. I couldn't believe it, the only person I have seen use less or the same is my 12 year old daughter who only weighs 80 pounds.

She says she is too lazy to change tanks between dives and has not had to switch tanks on a 2 tank dive in years, and most of the time she has enough air for 3 dives.

Must be nice

 

[scubadada]

324 respondents

 

[northernone]

The last time I was on a cattle boat (dozen holiday divers) was a couple years ago.

Went down with an al80 with 2800 psi, surfaced with the group at the end of their dive (500psi back on the boat) and I still had 2200 psi. The value wasn't there for me.

It's amazing how much body type, mental state and activity/exertion level can effect our metabolic rates.

Cameron

 

[KatieMac]

I'm not as good as your DM but it's not uncommon to come back with just under 1/2 tank after 60 minute dive. One of my better dives was 64 feet, 62 minutes and came back with 1400 psi, avg depth 37ft, SAC 0.30. My worst ever (besides the 4 ow dives) was 54ft, 61 minutes, avg depth 24ft, and back with 800 psi. But I also weight 1 1/2 times your daughter.

 

[scubadada]

Hard to tell how you do without average depth and cylinder characteristics.

 

[Altamira]

324 respondents
View attachment 470221

I know some people view RMV and SAC as a contest, and like to see/brag about where they fall in the RMV/SAC spectrum. I don't know where the graph originated, but it seems to me that the chart in Post #2 is of questionable use without a lot of additional information such as sex, body shape, age, weight, physical condition, experience, number and frequency of dives, typical dive profiles, stress level, and average depth and cylinder characteristics as posted by scubadada above, etc., of the divers sampled. Within my own RMV range, I know from experience, it just takes one diver in the group that is really pissing me off to radically change my numbers.

 

[KatieMac]

I know some people view RMV and SAC as a contest, and like see/brag about where they fall in the RMV/SAC spectrum. I don't know where the graph originated, but it seems to me that the chart in Post #2 is of questionable use without a lot of additional information such as sex, body shape, age, weight, physical condition, experience, number and frequency of dives, typical dive profiles, stress level, and average depth and cylinder characteristics as posted by scubadada above, etc., of the divers sampled. Within my own RMV range, I know from experience, it just takes one diver in the group that is really pissing me off to radically change my numbers.

I keep telling my husband that. He doesn't seem to get that his body mass is 50% greater than mine.

 

[GreggS]

My wife usually has a SAC rate between .25 and .28. She can usually do two 60+ minute dives on 1 80AL tank.

Me, I am usually in the low to mid .50 range, which is a lot better than it was when I first started.

But then, she's 5'4" and around 130 lbs while I'm 6' 1" and 260.

 

[scrane]

I think the best thing about having efficient air consumption is not having to freak out if your 3200 psi tank is actually only filled to 2700.

 

[scubadada]

I know some people view RMV and SAC as a contest, and like see/brag about where they fall in the RMV/SAC spectrum. I don't know where the graph originated, but it seems to me that the chart in Post #2 is of questionable use without a lot of additional information such as sex, body shape, age, weight, physical condition, experience, number and frequency of dives, typical dive profiles, stress level, and average depth and cylinder characteristics as posted by scubadada above, etc., of the divers sampled. Within my own RMV range, I know from experience, it just takes one diver in the group that is really pissing me off to radically change my numbers.

SB members, " What is your average RMV?"