#15582
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From LatitudeAdjustment: You need to do the math, SAC (Surface Air Consumption) and assume you will be breathing faster because of something that made you go to the pony in the first place times how deep are these wrecks you’ll be diving = what to buy. Ok, you’re going to make me sharpen my pencil here, let me give this a try!
If I’m 130 feet down, to reach the surface it will take me at least 260 seconds, but lets just round that up to 300 seconds even. I need to add in a 3 minute safety stop, so that’s 180 seconds, added to my 300 second ascent, makes it 480 seconds. Divide 480 by 60, gives 8 minutes. If my SAC is 2.0 cu ft per minute (more than double my normal rate due to the added stress of an out-of-air situation), 8 min times 2.0 cu/ft per minute SAC means I need at least a 16 Cu ft tank.
So, by going with the 19 cu ft pony bottle, I should have enough air to reach the surface safely. Does this sound reasonable?
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