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Do you lie about your helium content?

Discussion in 'Rebreather Diving' started by rddvet, Nov 25, 2019.

  1. rjack321

    rjack321 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
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    5%, 6% that is slicing hairs

    air vs 21/35 is going to be "more" different for the range these gases would be used
    15/30 vs 55 is going to be different for the ranges you might use 55% helium
     
  2. nickbutcher

    nickbutcher Angel Fish

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    That's why I don't consider it 'lying'. I just don't see any point changing the settings for the sake of a few percent when it's all just 'pull a number from your arse' anyway.

    Anyone using 15/30 needs to take a good long look in the mirror. Using heliair demonstrates a total lack of self-respect :p
     
  3. rddvet

    rddvet DIR Practitioner

    # of Dives: 50 - 99
    Location: Florida
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    I'm of the thought that a little extra deco is worth it, and whenever I've run the profiles the difference is not much, so I don't lie. I think it's pretty well known that 30/30 and 32% deco out pretty much the same and I'm really only focusing on pretty shallow dives on helium. When I've been questioned about why I don't cheat my computer, I don't really have a reason other than I'd prefer not to. I only bring it up because I was being prodded into a discussion about it and the other person made the point that if you run the tables and they're so similar, why not. I didn't really have an argument other than I don't and I'd prefer to do the extra deco. I think it was just one of those conversations where no matter what you say you can't win
     
  4. rddvet

    rddvet DIR Practitioner

    # of Dives: 50 - 99
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    I see no issue with that. I wouldn't call that lying either
     
  5. JonG1

    JonG1 Barracuda

    # of Dives: 2,500 - 4,999
    Location: Glossop UK
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    I always set the SW to the actual percentages, if it all went a bit wrong it might be even more wrong at the end of a bad day.
     
  6. rjack321

    rjack321 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, WA
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    Sadly sometimes you have to dive what you have (or can get) :(
     
  7. DeepSeaExplorer

    DeepSeaExplorer Solo Diver

    # of Dives: 500 - 999
    Location: Cave Country
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    Ahh... the Nitek HE. I spent $1,000 for that computer. I upgraded from the Nitek II and immediately noticed the penalty. I also noticed that if I just entered the O2 content with no Helium, it closely matched the tables generated by Deco Plannner. Anyway, after it added 45 minutes on O2 on a dive to 220fsw, I decided to use it in gauge mode on bigger dives. So I spent $1,000 for a bottom timer to replace a $500 computer that worked just fine. Ah... the good old days...
     
    rjack321 likes this.
  8. Wookie

    Wookie Secret Field Agent ScubaBoard Business Sponsor

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    We all did that
     
  9. kensuf

    kensuf Cave Instructor

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    Within 5%-10%, I won't sweat it (ex. computer being told I have 21/35 and really I'm running 18/45). But something grossly different, like running 10/70 and telling the computer I have 21/35, is a no-no.
     
    Caveeagle likes this.
  10. rddvet

    rddvet DIR Practitioner

    # of Dives: 50 - 99
    Location: Florida
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    I was talking more like putting in 30 or 32% for 30/30 or air for 21/35. I was told “it’s basically the same thing so no reason not to” as their reasoning. Which is a pretty dumb argument.
     

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