Last edited by BTS; 04-01-2015 at 11:44 AM.
What to do? I only have three bullets and there are four of motley crew...
If we are going to start posting run time,s for a 60m dive, Lets make it more than 30mins bt, please ,
Last edited by gobfish1; 04-01-2015 at 03:30 PM.
I have dived the Rosalie many times basickly its a 36m dive but you can get 50 if you hit the sea bed.
Last time i dived it in 2005 was on CCR and we were doing 90mins on the wreck 45 mins deco. Bailout was a single AL80 of air and 80% staged on the upline to the boat. We obviously had the option of pure 02 SCCR as well but with the viz on that wreck the upline was considered adiquate.
In the UK theres a wreck called the Moldavia. Its 50m with an average dive depth of 45m. We do 60mins on the wreck and 60mins deco runnig 18/35 trimix in the CCR.
On OC in twin 15s to do this bottom time with a SAC of 20 and NO GAS RESERVE 220 bar required
QED I think your initial comment was massivly inaccurate
My "normal" diving is 60-80m and 45-60min bottom times using two AL80s for bailout and a steel 10 drop tank on a deco station.
If you do the math for 45mins at 70m on OC? you will see its just impractical and thats ignoring the gas cost.
If you comment was bassed on 30m diving on a CCR? then frankly why dive a CCR at 30m unless you regularly do a lot of deeper dives as well and dont want to switch between OC and CCR
Last edited by Mark Chase; 04-01-2015 at 03:05 PM.
but it's 42 minutes on the 12s.
This is my gas planner card for what I can do.
The three columns are NS no stop, 5min I'd blow 5 minutes of stops and expect to get jumped on but still drive home and BO is breathing at least one of the tanks dry.
Last edited by nigel hewitt; 04-01-2015 at 03:31 PM.
Helium, because I'm worth it.
Waterboarding at Guantanamo Bay sounded like a radical holiday opportunity until I looked it up.
Much like nigel i cut range tables with my chosen settings. they fold over in the middle so side A has ccr mode and side b has bailout. The bailout side (bottom right), has the volume needed of each bailout gas for the different runtimes.
This means i can look at how much bailout i have and then choose a dive duration based on that.
Like mark and the others have said, stick with the ccr
ps. the above are real numbers, but the depths etc are omitted to make sure you have to work your own numbers
Waypoint at 60m for 30:00 (32) on Trimix 21.0/30.0, PPO2 1.429, END 33
Deep Stop at 39m for 1:00 (35) on Trimix 21.0/30.0, PPO2 1.002, END 20
Deep Stop at 30m for 1:00 (36) on Trimix 21.0/30.0, PPO2 0.819, END 15
Deep Stop at 24m for 1:00 (38) on Trimix 21.0/30.0, PPO2 0.697, END 11
Norm Stop at 18m for 1:00 (39) on Nitrox 50.0, PPO2 1.370, END 8
Norm Stop at 15m for 4:00 (43) on Nitrox 50.0, PPO2 1.225, END 6
Norm Stop at 12m for 5:00 (49) on Nitrox 50.0, PPO2 1.080, END 4
Norm Stop at 9m for 9:00 (58) on Nitrox 50.0, PPO2 0.935, END 2
Norm Stop at 6m for 10:00 (68) on 100% Oxygen, PPO2 1.580, END 0
Norm Stop at 3m for 18:00 (86) on 100% Oxygen, PPO2 1.290, END 0
TOTAL DECO TIME: 50 minutes.
DIVE RUN TIME: 86 minutes.
CNS Total: 54.7%
Time to Fly: 7.0 Hours
4331.0 Ltr. of 21.0/30.0 consumed.
595.2 Ltr. of 50.0% consumed. just tossed in for fun , could lose it and still get same bottom time , or bank on it and run a longer bottom time ,
596.3 Ltr. of 100.0% consumed.
iv said be4 iv 3 bottom times on ccr solo, buddy , and buddy/back at shot , cant do that oc
Last edited by gobfish1; 04-01-2015 at 09:16 PM.
then id use my in/off board o2 , depending on the dive that could be 3 5 or 6l worth , cant see the point of the side can of o2 , when iv got some to run the unit with ,
Last edited by gobfish1; 05-01-2015 at 07:46 PM.