ronski101
Contributor
Why has not someone invented a cheap, safe, easy to use semi-rebreathing system?
Since we only use 4% of the 21% O2 available in a breath from an open circuit tank, why is there not a system that would allow us to rebreath that first breath twice before expelling it thus allowing double bottom times or much smaller air tanks? Is it that difficult to scrub that one breath of CO2? Does that one breath really have to be scrubbed? If you start with Nitrox you should have about 30% O2 in the first exhaled breath to play with and only have to deal with CO2. Even if you could only save half of that first breath it could be a great advantage in diving with less bubbles, smaller tanks, longer bottom times, less dry mouth, deeper with nitrox, etc. Scuba has been around 60-70 years and has changed very little in the basic system.
This may have already been answered but I have not found it on this forum.
Don't flame me to bad......
Since we only use 4% of the 21% O2 available in a breath from an open circuit tank, why is there not a system that would allow us to rebreath that first breath twice before expelling it thus allowing double bottom times or much smaller air tanks? Is it that difficult to scrub that one breath of CO2? Does that one breath really have to be scrubbed? If you start with Nitrox you should have about 30% O2 in the first exhaled breath to play with and only have to deal with CO2. Even if you could only save half of that first breath it could be a great advantage in diving with less bubbles, smaller tanks, longer bottom times, less dry mouth, deeper with nitrox, etc. Scuba has been around 60-70 years and has changed very little in the basic system.
This may have already been answered but I have not found it on this forum.
Don't flame me to bad......