trimixer860:
Im new to this board so please be nice
I been reading a bunch of post on this board and have spent a few hours reading post on rebreathers. I was wondering is any one on the board would give me an exaple of a dive profile using ccr. Ill take one of my dives 160' 30 minutes on the bottom. My Mix 24/30 with two deco bottles nitrox 60 and O2. Total run time 55 minutes. Making the deco 22 minutes. If you where using a ccr for 160' for 30 minutes what would your profile be and what would you carry for a bail out bottle.Thanks
running a conservative profile with a 1.3 setpoint runtime would be about 58 minutes with a dil containing 30% Helium..
Bumping the deco up to 1.45 will cut about 4 minutes off the deco, doing to OC oxygen would bump another 2 or 3 minutes off..
My personal preference for a dive this short is to runmy bottom setpoint around a 1.3 and use this all the way to 20 fsw where I'll periodically flush with oxygen maintaining a minimum po2 of 1.45
For adive this shallow, I would normall do at least 60 minutes on bottom, with a total runtime of 2 hours.. If this was a big wreck or reef where you could multi level it Itd add in a 30 minute leg at 100ish and only add 22 minutes to the run time.. If I swapped out the 100fsw leg with a 60ft leg it would have only added 12 minues to the original run time..
This is a dive I have done many times in grand cayman..
130fsw for 60, 100 for 30, and 60 for 90 minutes.. If Im using air as a dil I have no required deco, if I uses 20% he, I have under 10 minutes of deco at 10fsw
This way I get my 3 hours of bottom time in on a single dive... If you wanted to do this OC you would need ALOT of Gas..
My worse case deco if I didnt get to do the shallow 60ft leg would be 40 minutes (if I did the entire 100ft leg), deco after the 160fsw stop is about 36minutes, so the 30mins at 100fsw is almost "free" (a 25 minute leg instead of 30 would have the same required deco time as not doing the leg at all)
This is the beauty of a CCR you can multi level the dive and since the loop gets richer as you ascend. you can deco while enjoying yourself..