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Inflating DSMB from QD hose

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

  1. Snoweman

    Snoweman Great White

    # of Dives: 100 - 199
    Location: Atlanta, GA
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    I'm not saying it can't happen, but how many people have had there string break solely due to tension during ascent of the DSMB??
     
  2. Jackie Treehorn

    Jackie Treehorn ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 200 - 499
    Location: Between Mikes and Weekapaug
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    I use a halcyon 3 footer as well. I shoot it regularly from depth (40-150 feet) on drift dives. I do it on exhale into a closed system.

    When doing recreational, lazy, drift dives (cozumel/jupiter) I might keep my drysuit hose to use on but I had a scare in my early diving career with a hollis SMB that would not disconnect from the hose.... it caused a bit of an uncontrolled ascent from 40 feet to the surface..... No injury as I mitigated the risk with counter kicking and continually trying to keep my lungs purged, but it put enough gremlins in my head to never consider that method when on a deep dive.

    There was something about that Hollis SMB that could get snagged. The Halcyon doesn't snag like that... but the gremlin in my head remains...
     
  3. Protondecay123

    Protondecay123 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 0 - 24
    Location: Apex of Moronia
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    I've done that with my Carter CBPF-35 from 90+ feet multiple times and it works just as well as at 40 feet. IF You have your technique right, there is no dip, lose buoyancy, nothing. Inflating the DSMB from the BC doesn't significantly change your buoyancy unless you spill a bunch of air into the water or otherwise have poor technique or an equipment failure. Adding another dedicated hose or detaching hoses to inflate a DSMB just seems like increasing the risk of task overloading or equipment failure.
     
    Snoweman likes this.
  4. tursiops

    tursiops Marine Scientist and Master Instructor ScubaBoard Supporter

    # of Dives: 2,500 - 4,999
    Location: U.S. East Coast
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    Not many, probably. But how many have lost their grip on the whole thing during the initial part of the ascent, especially?
     
  5. Diving Dubai

    Diving Dubai Instructor, Scuba

    # of Dives: 1,000 - 2,499
    Location: Dubai UAE
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    Horses for courses I guess

    I'm on my 3rd now - the dsmbs only last about 2 years here before the heat breaks down the internal gas coating (and they fade) but by that time it's had 100-200 launches

    I'm so practiced that it's instinctive and done without thought - which is good as sometimes we're caught in strong currents and my mind in on other more important things.

    When I travel I take a conventional bottom inflate because it'll be rare for me to send it up - being lazy and letting the guide do it
     
  6. dberry

    dberry Hydrophilic ScubaBoard Supporter

    # of Dives: 200 - 499
    Location: Philadelphia
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    This. I had a reel get snarled and suddenly get pulled from my grip. Adding air to my wing dealt with buoyancy, but not the sheepish feeling while tracking down the sausage and reel on the surface.
     
  7. rjack321

    rjack321 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, WA
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    #24 braided nylon has a test strength of 250lbs. Even if you cut that in half to account for knots and being wet, 125lbs is way more force than you can exert midwater. So unless you massively abrade the line your risks lie elsewhere - dropping it or getting tangled in it being by far the two most common.
    7007_14814_large.png
     
  8. Snoweman

    Snoweman Great White

    # of Dives: 100 - 199
    Location: Atlanta, GA
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    I was thinking about rot in the line over time.
     
  9. rjack321

    rjack321 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, WA
    10,433
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    Unless you leave it out in the sun or in acidic water, nylon doesn't rot.
     

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