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chunter · 8th January 2007, 23:47

For me, the narcosis is comparable on OC vs. CCR, however, the "task loading" factor comes into play much sooner on CCR. On OC, if you are breathing, you are probably ok, but that isn't the case on CCR. I find that the loss of time perception plays a big part in the danger of being narked on a CCR because it is difficult to tell how long it has been since I checked my PPO2, and in the event it has drifted below setpoint, how long was it below for? I used to do deep air dives to 200 feet regularly on OC, but I try not to push CCR air past 160 ft.

The real question is, if you are diving deep on CCR, why wouldn't you use trimix? Can't get helium? Can't afford the 2 cubic feet of gas?

Aloha,
Charlie

8th January 2007, 23:47	#4 (permalink)
chunter I like diving Current Rebreather/s: Sport Kiss MK 15.X Other Rebreather/s: Inspiration Classic Inspiration Vision Evolution Classic Kiss Join Date: Jul 2006 Location: Honolulu Posts: 478	Re: Deep air on OC vs. CCR For me, the narcosis is comparable on OC vs. CCR, however, the "task loading" factor comes into play much sooner on CCR. On OC, if you are breathing, you are probably ok, but that isn't the case on CCR. I find that the loss of time perception plays a big part in the danger of being narked on a CCR because it is difficult to tell how long it has been since I checked my PPO2, and in the event it has drifted below setpoint, how long was it below for? I used to do deep air dives to 200 feet regularly on OC, but I try not to push CCR air past 160 ft. The real question is, if you are diving deep on CCR, why wouldn't you use trimix? Can't get helium? Can't afford the 2 cubic feet of gas? Aloha, Charlie
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