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Stack timer question (rebreather use)

Discussion in 'Shearwater Research' started by broncobowsher, Jan 20, 2019.

  1. doctormike

    doctormike ScubaBoard Supporter Staff Member ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: New York City
    5,844
    4,956
    113
    Yup, I like it too, and use it. The same way I like a physical printed checklist. It's easy to get distracted and forget stack time, this is a good thing.

    I was just making the point that you need to understand what it really represents - there was some suggesting early in the thread that a few minutes added or subtracted from the stack time was a precise thing that needed to be accounted for so that you would get exactly the right amount of time that you were owed from the scrubber. I don't think that is really how it works...
     
  2. rjack321

    rjack321 Captain

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, WA
    8,403
    2,193
    113
    I would hope that whatever time you tell the stacktime counter isn't so close to the edge that it matters if your turn on and/or prebreathe time was 2 mins or 15 mins. If I could implement stack time on my own wrist, I would have it turn on at 1 or 2ft depth. I could see why they might not choose that start for widespread implementation however. And I also somehow managed to survive without a stack timer at all so there's that.
     
  3. rddvet

    rddvet DIR Practitioner

    # of Dives: 50 - 99
    Location: Florida
    677
    407
    63
    You're creating a problem where a problem doesn't exist. If it's that big a deal to you, then shorten your stack time by 15 minutes. Should you realistically rely on the stack time to be your go/no-go decision maker, and in the grand scheme of things does 15 mins of surface breathing mean a CO2 hit? Probably not. My scrubber gives me about 6 hours of dive time. That's about, because there's not solid evidence that it will always last 6 hours, just assumptions based on experience and the experience of others. To be safe, I set my stack time to 5.5 hours.

    15 minutes should not make a big difference. Shearwater should leave it how it is. Not too many others have an issue with it.
     

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