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The Effect of
Breathing Rate on a Marginal Bail-Out Bottle |
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Each Diver starts
breathing a 3 cubic foot "Bail-Out Bottle" at 100 fsw and
immediately begins ascent at 50 feet per minute. |
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Diver A is breathing a
constant 10 breaths per minute. Diver
B is breathing a constant 12 breaths per minute. |
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At an ascent rate of 50
ft/min, Diver A needs 20 breaths to reach the surface. Diver B needs 24 breaths. |
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A slightly higher SAC
causes Diver B to run out of gas at about 30 ft. Imagine the result of panic on SAC. |
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Common Factors |
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Tank Capacity
(cf) |
3 |
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Volume per
Breath (cf) |
0.058 |
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Ascent Rate
(ft/min) |
50 |
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Diver A |
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Breaths per
minute |
10 |
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Calculations |
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SAC (cf/min) |
0.58 |
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Diver B |
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Breaths per
minute |
12 |
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Calculations |
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SAC (cf/min) |
0.70 |
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