• Welcome to ScubaBoard


  1. Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.

    Benefits of registering include

    • Ability to post and comment on topics and discussions.
    • A Free photo gallery to share your dive photos with the world.
    • You can make this box go away

    Joining is quick and easy. Login or Register now by clicking on the button

1st time deploying DSMB underwater. Need feedback on issue.

Discussion in 'General Scuba Equipment Discussions' started by Fastmarc, Jul 14, 2019.

  1. happy-diver

    happy-diver Skindiver ScubaBoard Sponsor

    # of Dives: 2,500 - 4,999
    Location: queensland Melbourne diver
    682
    375
    63
    here's the one I pretend to be an expert with

    OTG Dive

    blow it up fully with one breath, hold it until I disentangle myself and until knowone is watching
    poof up it goes and I can pull it down again anytime I like
     
  2. Jcp2

    Jcp2 Barracuda

    330
    222
    43
    I saw this short training SMB that seemed useful. It’s a. It’s pricy but replicates the company’s full sized version.

    AP Training SMB | AP Diving

    If you have a sealed SMB with an overpressure relief valve, I suppose you could make something similar by folding it over and securing the fold with binder clips?
     
  3. Zef

    Zef Divemaster

    1,369
    805
    113
    OR just take a DSMB and tie it in a knot...this reduces the amount of air that one can fill it with making it easier to pull back down to reset and relaunch.

    -Z
     
    FezUSA likes this.
  4. Fastmarc

    Fastmarc Just drifting along... ScubaBoard Supporter

    # of Dives: 200 - 499
    Location: Kingston, Jamaica
    1,299
    249
    63
    Now that you mentioned it, the anchor line angle was pretty acute and the pull on it did somehow undo the knot. There was a current at the anchor, but it wasn't strong, but we were only at about 45ft and I had to let out most of the spool to stay stationary while he was attaching his smb to the anchor line. The pull on it was surprising. I didn't expect that and as I said above, I had to let out more and more to keep my depth. This would suggest as you said above that the current was stronger near the surface, plus the wind, but to be honest because it was my 1st time ascending with this thing, that had my attention and I didn't take note of how fast we were drift while doing my safety stop.
    We had to grab a line and be pulled in when we surface which were accompanied with some strong tugs of the line from the boat and the waves. Ended up with cuts on a couple of fingers as a result as I did have any gloves on. Again, this lines up with what you are saying.

    It seems he only used it because they thought it might have been possible that the anchor might not hold. It wasn't used on the second dive.
    Yep, quite a learning experience for me. Looking forward to some practice with it.
     
  5. Fastmarc

    Fastmarc Just drifting along... ScubaBoard Supporter

    # of Dives: 200 - 499
    Location: Kingston, Jamaica
    1,299
    249
    63
    One thing I'm curious about, would a DSMB of this size fully inflate from 45ft?
    I'm wondering if it didn't, would that make it more susceptible to taking in water from the open bottom when I was holding it against the current?
    I did blow in it twice. The 1st was to really just straighten it out, though I suspect I gave it a little more air than necessary for this purpose. The second I thought was a proper blow and it did start to affect my buoyancy just before I let it out.
     
  6. The Chairman

    The Chairman Chairman of the Board

    # of Dives: I just don't log dives
    Location: Cave Country!
    54,825
    21,856
    113
    Task loading. It's the most overlooked problem on the boat and in the water. The only way through is to keep going through it. Sry.

    Diving is not for wimps. Wait till you first try the "pull 'n glide" in a cave system and then go eat hot wings. Woowee that's some fun for everyone else at the table. :D

    Learn or improve something on every dive. Learn to read currents and how to dodge them. The ocean is far, far, far stronger than you are. Dive smarter, not harder.

    Depends on how you inflate it. Mine never seems to need Viagra, but then I use an inflator hose and the special nipple found on a few SMBs. Unplug the inflator hose from my BC (if I'm using the bladder), prepare the spool & SMB, hold the package in my left hand, plug in the hose for 1, 2. 3 and let it all go. The spool will eventually fall back to you. All this while I'm drifting.
    All SMBs should have OPVs. And low pressure nipples that don't hold the hose.
     
    Fastmarc likes this.
  7. The Chairman

    The Chairman Chairman of the Board

    # of Dives: I just don't log dives
    Location: Cave Country!
    54,825
    21,856
    113
    2hcvm1.jpg
     
  8. Zef

    Zef Divemaster

    1,369
    805
    113
    This tends to be true for plastic spools, but tends to not be true for metal spools. With a metal spool the tendency is the spool just drops below you letting out all the line....if you didn't unwind all the line when the spool was new to check that the end of the line was securely tied to the spool, then goodbye spool.

    -Z
     
    The Chairman likes this.
  9. Fastmarc

    Fastmarc Just drifting along... ScubaBoard Supporter

    # of Dives: 200 - 499
    Location: Kingston, Jamaica
    1,299
    249
    63
    I was a little worried about the spool while I was letting it out which was really unjust since the bottom was not too far. Good to know I don't have to be too concerned since I have the plastic spool.
    Interestingly the guide was using a reel which he sometimes attached to his BC when he was using both his hands doing something.

    Both dives were on the poor side, but having to shoot the DSMB made the trip for me and has given me lots to think about for a while.

    Thanks for all the replies.
     
    The Chairman likes this.
  10. The Chairman

    The Chairman Chairman of the Board

    # of Dives: I just don't log dives
    Location: Cave Country!
    54,825
    21,856
    113
    Keep your hand under a metal spool as it doesn't tend to ascend like a plastic spool (inertia).
     

Share This Page