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Inflating DSMB from QD hose

Discussion in 'Advanced Scuba Discussions' started by BlueTrin, Oct 26, 2020.

  1. Edward3c

    Edward3c Instructor, Scuba

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    There OK until they hit the surface, fall over and half the contents flow out. I used one like that for a few years before getting one with a sealed bottom.
     
    rongoodman and NothingClever like this.
  2. rjack321

    rjack321 ScubaBoard Supporter ScubaBoard Supporter

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    I'm guessing you aren't using a suit gas bottle? (yet? or ever?)

    The normal thing would be to a have a suit gas bottle and a short drysuit hose from that. Then the drysuit hose which is leftover on your left post is run down just behind your spg. Reach back there and pull it forward on top of all your stage bottles, inflate your 6ft SMB from a significant depth 20m+ so it doesn't require much gas to be full at the surface.

    If you are already at a shallow stop then its too late to be shooting giant SMBs, plus what do you need it for? In the course of a 3-5min safety stop you won't go THAT far. Shooting big SMBs on your ascent is for when you have a long deco obligation and you can move a long long way from the boat in 45-60mins+.

    Don't go disconnecting your wing.
     
    shoredivr, NothingClever and BlueTrin like this.
  3. Edward3c

    Edward3c Instructor, Scuba

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    It’s easy to drift long distances in the U.K. For example, coming off the Shona, in the Sound of Mull, slack can go from 0.1knt to 5knt in less than 5 minutes. Be a minute or two late leaving the wreck and you will by 1 or 2 miles up, or down, the Sound by the time you surface.
     
    shoredivr and BlueTrin like this.
  4. rjack321

    rjack321 ScubaBoard Supporter ScubaBoard Supporter

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    5mins at 2knots is about 1,000ft or a little less than a quarter mile away (from the boat). But this assumes the boat is anchored. In either case (which I already said) I would shoot a big SMB from near the bottom.

    Don't go doing a free ascent up to 15ft then expect to shoot a 6ft SMB. It doesn't work and its way too late. Also don't go shooting baby SMBs, drifting for long period of time beneath a tiny bag, and somehow expect the boat to find you later when you finally surface and only then shoot the 6ft bag.

    A) No currents
    Just go up, shoot baby SMB near surface so the boat doesn't run you over. Getting lost not a concern.

    B) Lots-o-currents
    Then shoot big SMB from the bottom or sometimes the first stop. Drift under big bag so they don't lose you.

    When you are practicing in the lake you need to simulate dive type B not A
     
  5. hroark2112

    hroark2112 Tech Instructor

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    Not that hard to control. Plus some open bottom DSMBs have magnets in them to hold the bottom shut.
     
    Snoweman likes this.
  6. rsingler

    rsingler Scuba Instructor, Tinkerer in Brass Staff Member ScubaBoard Sponsor

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    My 5' open bottom Edge-HOG has a duckbill valve in the conical open bottom that seals itself and won't dump at the surface. You can inflate it orally (bad idea at this size), with an inflator, or using your wing or auxiliary second stage.
     
    lsmike, hroark2112 and BlueTrin like this.
  7. davehicks

    davehicks ScubaBoard Supporter ScubaBoard Supporter

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    lsmike likes this.
  8. Snoweman

    Snoweman Great White

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    I like my open bottom dsmb with a duck valve. On my last visit to Cozumel, the dive master showed me how to use both hands to hold the bottom open, turn my head and use a couple of exhales from my reg to inflate the BCD at depth. This was so much easier than trying to use my octo.
     
  9. BRT

    BRT not a soft touch ScubaBoard Supporter

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    At that point in the dive why do you have enough air in your wing to inflate a DSMB?
     
    rjack321 likes this.
  10. tursiops

    tursiops Marine Scientist and Master Instructor ScubaBoard Supporter

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    Be ready to put new air in your wing as soon as you let go of the SMB!
     
    BlueTrin likes this.

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