Simple SAC Calculation

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OldNSalty

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Location
Just this side of paradise.
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So I was reading the SDI solo book and it said to calculate your SAC rate simply go grab a tank, breath off the reg while sitting there reading a book or watching TV and then do the math after 10 or 20 minutes.

While I agree that this would yield a value, I think it would be overly optimistic or am I missing something? Every time I have heard someone talk about measuring SAC it has always been at depth, while diving and then adjusted.
 
Don't worry, if that overly optimistic SAC leads to an OOG, just turn to your buddy.

Oh wait...

:)
 
Sure, then double it 'cause your working, double it again for excitement, adjust it for depth ... that'll be close, but I wouldn't bet my life on it.
 
SAC rates vary depending on what your doing and at what depth your doing it at. If you're in still water, neutrally buoyed just cruisin' along relaxed, why would it be any different than sitting in a chair watching the news for example. I might use MORE air watching the news:D You need a baseline to work from on the surface in a chair is as good as any. Just don't use it to plan a deep dive in a strong current. You'll need to adjust for each dive. The more you dive and pay attention to your SAC the better your adjustments will become. I timed how long it takes for me to use 500psi of gas under different conditions. I use that base line to plan gas consumption for my dives. Even that needs adjusting if your fitness changes. My SAC at 55 years old is higher than when I started at 15.
 
Don't worry, if that overly optimistic SAC leads to an OOG, just turn to your buddy.

Oh wait...

:)

What if your buddy isn't on the couch with you? Or what if he is, but has a beer in his right hand? Is he supposed to donate the pizza in his left?...Never mind...I forgot...you're solo diving...so it's your pizza...now I'm confused!
 
So I was reading the SDI solo book and it said to calculate your SAC rate simply go grab a tank, breath off the reg while sitting there reading a book or watching TV and then do the math after 10 or 20 minutes.

While I agree that this would yield a value, I think it would be overly optimistic or am I missing something? Every time I have heard someone talk about measuring SAC it has always been at depth, while diving and then adjusted.

Have you finished the book? Is this the last word on how to calculate your SAC or is it just the first introduction as a way to go though the process?
 
What if your buddy isn't on the couch with you? Or what if he is, but has a beer in his right hand? Is he supposed to donate the pizza in his left?...Never mind...I forgot...you're solo diving...so it's your pizza...now I'm confused!

:rofl3:
 
Okay, so grab your tank and regulator, get on the treadmill on high, and watch a porn flick . . . will that work? :blinking:
 
https://www.shearwater.com/products/perdix-ai/

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