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Your Gradient Factors?

Discussion in 'Technical Diving Specialties' started by CAPTAIN SINBAD, Nov 20, 2020.

  1. jvogt

    jvogt ScubaBoard Sponsor ScubaBoard Sponsor

    # of Dives: 200 - 499
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    I ran DSAT on my sport PDCs for years, so probably GF HI around 95. In the 90s, post dive fatigue and skin tingles where "just part of diving" for me. When I started tech I went with 50/80. After getting "lightly" bent a couple times on that I started playing with my GFs and paying more attention to subclinical symptoms. Tried 70/70 and got symptoms about halfway through deco, so started lowering GF Low a bit. Now I have landed on 50/65 and it seems to be working well. COVID has delayed my plans to get a PFO check.

    I have also found that setting the GF High aggressively then waiting for extra conservatism in the shallows does not work well for me. If I want to get out with a surface GF of 65 it's best I set it in the PDC and ride it out through all the stops.
     
  2. jvogt

    jvogt ScubaBoard Sponsor ScubaBoard Sponsor

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    Everyone's physiology is different, mine would not like it.
     
    100days-a-year likes this.
  3. 100days-a-year

    100days-a-year Solo Diver

    # of Dives: 5,000 - ∞
    Location: NE Florida
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    Best answer!!
    I have no idea of the physiology of another diver, nor they mine so making large scale pronouncements doesn't seem wise.
    I have had friends get bent diving well within their " conservative " computer's range. Scar tissue, general fitness, ascent rates are just a few parts of the picture.
     
  4. jvogt

    jvogt ScubaBoard Sponsor ScubaBoard Sponsor

    # of Dives: 200 - 499
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    Any overt symptoms are almost always in my right shoulder area where I have had reconstructive surgery. Good news is, I'm pretty sure the titanium is not getting bent. :wink:
     
  5. _Ralph

    _Ralph Manta Ray

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    What’s your average depth when you get out of the water for a deco dive?

    Notice any trends?

    _R
     
  6. scubadada

    scubadada Diver Staff Member ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
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    Hi @100days-a-year

    You're right, the Orca Edge appears to run a GF high of around 90-95 on 1st, clean dive. Do you have any idea how it performs on repetitive dives? I've never been able to find any information on this. For example, DSAT is generally a bit more liberal than a GF high of 95 on the 1st dive. On repetitive dives, a GF high of 95 tends to become more liberal than DSAT, particularly at shallower depths.

    upload_2020-11-21_10-14-55.png upload_2020-11-21_10-22-55.png
     
  7. DiveTucson

    DiveTucson Nassau Grouper

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    I was 100% joking about the 99/99. It’s a thing we have running with some friends.

    Personally I run more conservative than that and like you said everyone is different so no need to throw out what I am actually running as it means nothing.
     
    jvogt likes this.
  8. OTF

    OTF Solo Diver

    # of Dives: 200 - 499
    Location: New England
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    I have no idea what my average depth is when surfacing, I don't really look at average depth or see why I would. Sometimes I look at surfGF to pad the conservatism beyond my normal plan, if there's no pressing reason to get out I'll hang out until it drops to 60 or something. That may parallel your average depth method. What's the trend you're referencing?

    Anyway, it's possible I was misreading your post, but what I was calling crazy wasn't anything to do with average depth or gradient factors. It was the act of rocketing up to the surface from 6m and breaching yourself onto the swim platform. Those last several meters are the part of the ascent where pressure change (and gas expansion, aka bubble formation) is greatest and you should go the slowest. I make a point of going extremely slow between the last stop to the surface, especially with demanding or multiple dives.
     
  9. nadwidny

    nadwidny Instructor, Scuba

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    15-20ish years ago we were regularly running 95s. Open circuit. I knew some folks from Seattle that were running 110s.
     
  10. CAPTAIN SINBAD

    CAPTAIN SINBAD Divemaster Candidate

    # of Dives: 200 - 499
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    This thread has been enlightening because I was not expecting 90s and 95s to be this common. Some have been diving past 100!
     

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