Imported post
its just a baby compared to the inspiration, but its what i hav got at the moment
within my diving circle i am the only one with a re-breather, and i have only had it a couple of months, just done 8 dives on it
there are obviously some rebreather gurus here, so could you please give me your opinion
am i being thaughtfull or foolhardy??
the drager ray is rated by drager as a semiclosed rb, to only use 50%o2 and a maximun depth of 22m, there is no give and take, these are the limits of the unit designed by drager,
now imo these limits hav been set by the 2 extreams of breathing rate and o2 consumption/absorbtion,
with an 8lpm nossle anything less than 50%o2 could be matabalised to below 17%02 in the loop with a breathing rete/absorbtion of 3/3.5 lpm, and with a breathing rate/absorbtion of 0.3lpm 50%o2 (about 44% in the loop) will hit 1,4ppo2 at 22m
now if you know your metabolic rate/o2 consumption and you do the maths you can see that these figures can be taylored to you,
i did a dive to 35m
i increased the size of the cylinder, took a bailout cylinder, decreased the mix to (aprox, cant rember) 35%, and had no problems, i hit 1.35ppo2 at 37m, i tried to simulate laboured breathing, but this had no effect on the ppo2
i took the unit 50% below its maximum depth, and i would plan dives to a maximum of 40n on the unit (but not till i have done more dives)
i allso intend to put a little 1.5litre cylinder on the unit for any deco (only small amounts up to 10 mins) i may occour
its just a baby compared to the inspiration, but its what i hav got at the moment
within my diving circle i am the only one with a re-breather, and i have only had it a couple of months, just done 8 dives on it
there are obviously some rebreather gurus here, so could you please give me your opinion
am i being thaughtfull or foolhardy??
the drager ray is rated by drager as a semiclosed rb, to only use 50%o2 and a maximun depth of 22m, there is no give and take, these are the limits of the unit designed by drager,
now imo these limits hav been set by the 2 extreams of breathing rate and o2 consumption/absorbtion,
with an 8lpm nossle anything less than 50%o2 could be matabalised to below 17%02 in the loop with a breathing rete/absorbtion of 3/3.5 lpm, and with a breathing rate/absorbtion of 0.3lpm 50%o2 (about 44% in the loop) will hit 1,4ppo2 at 22m
now if you know your metabolic rate/o2 consumption and you do the maths you can see that these figures can be taylored to you,
i did a dive to 35m
i increased the size of the cylinder, took a bailout cylinder, decreased the mix to (aprox, cant rember) 35%, and had no problems, i hit 1.35ppo2 at 37m, i tried to simulate laboured breathing, but this had no effect on the ppo2
i took the unit 50% below its maximum depth, and i would plan dives to a maximum of 40n on the unit (but not till i have done more dives)
i allso intend to put a little 1.5litre cylinder on the unit for any deco (only small amounts up to 10 mins) i may occour