Hello all,
So I have read just about as much as I can on how to calculate SAC Rates.
I have even made a shiny new Excel Spread sheet that does volume of air (In Litres) for a specified Tank size (Litres again, sorry) at various Tank pressures (Bar) and depths (meters) then, based on an inserted SAC Rate, will calculate the time available(in minutes) at given depths (in meters) based on the tank size and tank pressure. (If you cannot work out that I am proud of my project yet then .... ) anyway .. All the work is worth Nara if I do not know what my SAC Rate is, so ...
What is the best method of establishing a personal set of data to calculate the SAC Rate? I have thought that the following scenario would work but would like feedback from the Forum on the "validity" of this method.
Would this be a reasonable method to accurately determine a working and relaxed SAC Rate?
Thanks in advance
Richard
So I have read just about as much as I can on how to calculate SAC Rates.
I have even made a shiny new Excel Spread sheet that does volume of air (In Litres) for a specified Tank size (Litres again, sorry) at various Tank pressures (Bar) and depths (meters) then, based on an inserted SAC Rate, will calculate the time available(in minutes) at given depths (in meters) based on the tank size and tank pressure. (If you cannot work out that I am proud of my project yet then .... ) anyway .. All the work is worth Nara if I do not know what my SAC Rate is, so ...
What is the best method of establishing a personal set of data to calculate the SAC Rate? I have thought that the following scenario would work but would like feedback from the Forum on the "validity" of this method.
- In order to keep this as acurate as possible, all tests are done on the surface (but in the water).
- Get into the water with all equipment etc.. as expected for a normal dive.
- Wait a few minutes (5 should do) for the tank temp to normalise.
- Note the pressure and start a 10 minute timer.
- After 10 minutes, Note the pressure again and start the next 10 minute timer.
- Start finning (hard) by pushing against the boat (or any other relatively fixed object).
- After (the second) 10 minutes, Note the pressure again.
- Do the Math
Would this be a reasonable method to accurately determine a working and relaxed SAC Rate?
Thanks in advance
Richard