No-fly in Subsurface?

[Rick Walsh]

On 25 July 2016 at 09:33, John Van Ostrand <john at vanostrand.com> wrote:

>
> Although my Cochran offers very generous amounts of no-deco time the one
> conservative feature is its no-fly time. At the end of a week of
> live-aboard diving it often displays no-fly times well over 24 hours.
>
> I can only guess that it's offering desaturation time. The fact that in
> practice a 20 tissue model no-fly time is longer than the 16 tissue model
> also suggests it's a desautration level and the longer tissues of the 20
> tissue model means longer desat times.
>
>
>
In the DAN Flying After Recreational Diving workshop proceedings, Mike
Cochran said that the Cochran dive computer calculates no-fly time as time
it takes for all tissues to reach ambient pressure (i.e. desaturate) then
add 12 hours.  That sounds like a conservative approach and is no doubt why
your dive computer gives long no-fly times.
p82 (p83 of the pdf)
https://www.diversalertnetwork.org/files/FADWkshpBook_web.pdf

He didn't say what they consider to constitute having reached ambient
pressure (x half lives or a maximum difference between tissue and ambient
partial pressure).

R
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