help with my SAC

[Icarusflies]

Hello All;

I am trying to get my SAC done and I am not sure the formula is correct.

This is what I get.

Average depth: 70 fsw
Dive time: 35 minutes
PSI used: 2400 psi
Tank used: 100 cuf rated at 3440 psi

I get a SAC of 0.67

Can you confirm

Thanks

*this is not an actual dive is just an exercise

 

[TSandM]

I get .64.

2400 psi/35 min = 68.6 psi/min
100 cu ft/3440 psi = .029 cu ft/psi
68.6 x .029 = 1.99 cu ft/min (at depth)
1.99 / (70/33 + 1) = .64 cu ft/min at 1 ATA

 

[texdiveguy]

These might come in handy:

http://www.spearfishing.org/bruces_tips/java/sac.html

TSandM is correct, 0.64

 

[firemedic1015]

I come up with 0.64 as well.

 

[Icarusflies]

thank you guys, I was doing it wrong, now I see.

thanks again

 

[tedwhiteva]

Another thing if you want it accurately - don't use "average depth". Instead, swim at a constant depth for a period of time (10 minutes works well). Note pressure at start and end of the time, then use the formulas above. It will be more accurate.

 

[kidspot]

What I like about the spearfishing website posted above is they also give you the formula, so you can try it yourself, then check with the calculator ...

 

[Texasdivechick]

OMG. You mean diving involves MATH? What did I get myself into?

 

[plot]

OMG. You mean diving involves MATH? What did I get myself into?

Only if you want it too. :crossbone