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  1. #151
    feckface von clownstick BTS's Avatar
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    Quote Originally Posted by Ihsaan View Post
    Thanks for the replies.... Lol. The training states dive planning should take into account the amount of oc bailout carried. Clearly there is variation between the supremely cautious and those more liberal. Personally I tended towards the more liberal approach, having enjoyed some great dives on the CCR, the highlight being a 50 min bt dive on the rosalie moller.
    But it only has to get you out of the water, it isn't there for continuing the dive.....

    A couple of 7 litre tanks, one for deep bail and one for shallow deco are enough for most people to pull off a 60m dive for 30 minutes...
    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...

  2. #152
    Established TDF Member matt's Avatar
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    Quote Originally Posted by Ihsaan View Post
    Thanks for the replies.... Lol. The training states dive planning should take into account the amount of oc bailout carried. Clearly there is variation between the supremely cautious and those more liberal. Personally I tended towards the more liberal approach, having enjoyed some great dives on the CCR, the highlight being a 50 min bt dive on the rosalie moller.
    Please give an example of a dive that led to your decision.

  3. #153
    Last of the Mohicans gobfish1's Avatar
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    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.

  4. #154
    Old but keen Mark Chase's Avatar
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    Quote Originally Posted by Ihsaan View Post
    Thanks for the replies.... Lol. The training states dive planning should take into account the amount of oc bailout carried. Clearly there is variation between the supremely cautious and those more liberal. Personally I tended towards the more liberal approach, having enjoyed some great dives on the CCR, the highlight being a 50 min bt dive on the rosalie moller.

    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
    ATB

    Mark
    Last edited by Mark Chase; 04-01-2015 at 03:05 PM.

  5. #155
    Established TDF Member nigel hewitt's Avatar
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    Quote Originally Posted by gobfish1 View Post
    If we are going to start posting run time,s for a 60m dive, Tets make it more than 30mins bottom time.s, please ,
    Sorry. It's only 26mins on the 7L bailouts
    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.

  6. #156
    #keepittea ebt's Avatar
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    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
    Last edited by ebt; 04-01-2015 at 03:52 PM.

  7. #157
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    Quote Originally Posted by nigel hewitt View Post
    Sorry. It's only 26mins on the 7L bailouts
    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.
    I use 60% for deco rather than 50%, make a difference. OK, you need to get to 18m (but I'd happily breather 60% at 21m for a few minutes) but I found trimix + 60% balances the gases required better, use a bit more trimix & less deco gas.

  8. #158
    Last of the Mohicans gobfish1's Avatar
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    Quote Originally Posted by JPTaylor View Post
    I use 60% for deco rather than 50%, make a difference. OK, you need to get to 18m (but I'd happily breather 60% at 21m for a few minutes) but I found trimix + 60% balances the gases required better, use a bit more trimix & less deco gas.
    yes i like the odd ball numbers 57 64 some times just to balance the gas required ,

    oc diver
    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%
    OTU's: 123

    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.

  9. #159
    Last of the Mohicans gobfish1's Avatar
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    Quote Originally Posted by nigel hewitt View Post
    Sorry. It's only 26mins on the 7L bailouts
    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.
    i never take o2 in a bailout, trying to get back on the 18/40 just eats your gas , id toss in a 50 57 64 or what ever ,
    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.


 
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