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  1. #31
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    This article on our website might add some light to the discussion:

    https://www.shearwater.com/monthly-blog-posts/eliminating-helium-penalty/

  2. #32
    Old but keen Mark Chase's Avatar
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    Quote Originally Posted by Shearwater View Post
    This article on our website might add some light to the discussion:

    https://www.shearwater.com/monthly-blog-posts/eliminating-helium-penalty/
    Its all good stuff and very supportive of Heleox and harks back to the Comex stuff where they decided 20 years ago that Heleox was better than Trimix (whilst not being very supportive of our deco scheduals )

    However the problem remains in the bailout gas choice.

    Unless your going to use Heleox all the way out, is it safe to suddenly introduce nitrogen in a bailout profile?

  3. #33
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    Hi Mark,

    If you are concerned about ICD, this paper is a good current review of the topic: http://archive.rubicon-foundation.org/8179

    Bruce

  4. #34
    Old but keen Mark Chase's Avatar
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    Quote Originally Posted by Shearwater View Post
    Hi Mark,

    If you are concerned about ICD, this paper is a good current review of the topic: http://archive.rubicon-foundation.org/8179

    Bruce


    No not in the slightest concerned about ICD

    Only cases of ICD I have read about were monster deep (Dave Shaw support diver case in point)

    The concern was raised by the chap from comex about being nitrogen free and then suddenly introducing nitrogen at depth. So this would be intermediate bailout depths, say coming of 13/87 Heleox on to 21/35 at 60m

    Apparently despite the narcotic depth being shallow (say 30m) it can cause the sort of first cigarette head rush which is scary / disorientating.

    I have never put it to the test in this way but I remember after a couple of years of only diveing trimix in my CCR id have banked two dills. 18/45 or 13/75. Id dive Stony Cove on 18/45??

    End result I did a normal OC 30m single tank dive in warm blue water and felt reely odd. Then i realised i was narked????

    Which was a shock to someone who dived air to 50m regularly for years and had done dives as deep as 80 on air and prided my self one being able to handle narcosis.

  5. #35
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    Quote Originally Posted by Mark Chase View Post
    Its all good stuff and very supportive of Heleox and harks back to the Comex stuff where they decided 20 years ago that Heleox was better than Trimix (whilst not being very supportive of our deco scheduals )

    However the problem remains in the bailout gas choice.

    Unless your going to use Heleox all the way out, is it safe to suddenly introduce nitrogen in a bailout profile?
    Heliox Dil = Heliox bailout ... cylinders ride nicer that way and given the (lack of) frequency of bailout the initial few quid to fill shouldn't be a major issue.


 
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