Re: 19cu/ft pony bottle bottom times, the first place to look for a dive instructor

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Posted by Ross-O on August 23, 2004 at 10:42:45:

In Reply to: 19cu/ft pony bottle bottom times posted by Nate on August 23, 2004 at 10:10:11:

Time = Volume / (Pressure in Atmospheres{absolute, not gauge} * your respiration rate on the surface)

Most of my buddies and I have RMVs (repiratory minute volume, a term basically meaning your consumption of air in cuft/min at the surface) of somewhere around 0.6.

Assume you're at 66ft (3 ata)

Time = 19 cuft / (0.6 cuft/ata*min * 3ata)

Time@66 = (less than) 10.6 mins
Time@33 = (less than) 15.8 mins
Time@99 = (less than) 7.9 mins

If you get scared, your RMV will likely triple (unless, of course, your Seahunt, who is immune to fear while underwater), so now your time @ 66' is less than 3.5 mins.

Better hope that whatever terrible thing that just happened to cause you go to your pony can be resolved fairly quickly ;-)


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