Deep stops

[Mr.Hansen]

How does this work?
I tryed A. A. Bühlmann GF deco extension (Deep Stops), but there is no deep stops.
The first stop is 9,6,3m on a 45m(24min) dive. It shud stop me on ((45+9)/2)=27m and a stop at 18m, for 2min.

So can someone inlighted me please. )

Dag

[gorcio]

Did You actually switch the algorithm ? Sorry for a stupid question, but by default it runs pure BUhlmann, that does not include GFs in the calculation, and You need to change it Yourself.
Next question - what are Your values for GF low and high ?

[Olivier]

And note that there's NO Pyle stop (which is what you're calculating) in the algorithm, only the possibility to get a Bühlmann + GF deco, which will give you deeper stop than simple Bühlmann, but nothing to do with the Pyle stops. Maybe you should read a bit to well understand the difference between GF and Pyle stops !

Cheers

[Mr.Hansen]

Yes it is Pile Stops i refer to. Yes I did change the algorithm. 30, 90 is the standard in OSTC mk2.

Is there a reason why not to use Pile Stops? If I'm not mistaking VR3 are using Pile Stops. Is there a easy answer to why OSTC is not using it?
I have been reading 'Deco for Divers' but can't find a answer there.

Dag

[Steve]

Pyle stops aren't in the algoritme of the OSTC, so you can't use it. Remember Pyle stops aren't holy making, but if you feel yourself better after a dive when using a deep stop like pyle, just do so. (easy to calculate yourself) however the OSTC will see this as still diving but as i experience you will nog be penalized that much.

[gorcio]

Why use Pyle's stops if You have stops generated by the algorithm (+ GFs). I can't believe it wouldn't give You stops on 45m/24'as You indicated. Just to be sure - run same profile through simulator. Just put params in , and ask it to calculate deco.

[wrobell]

lower first number to get deeper deco stops, i.e. from 30/85 to 20/85.

more at

http://www.rebreatherworld.com/general- ... mmies.html

[ajmp]

Deco for divers:
Deep stops: p139
Pyle stops: p140
Gradient factors: p144
All in the chapter called 'deep stops and bubble models'
Chapter 6
Software that use gradient factors:
GAP, windows and win mobile
Decoplanner, windows
Mvplan, windows, mac and Linux
Ideco, iPhone
There are others that I can't think of,
Also Google; 'clearing up the confusion about deep stops' by Eric baker

[Alex]

The main difference between the two types of deep stops is that Pyle is generated by averaging bottom depth and first deco (as you have demonstrated).

Thus, contrary to GFs no offgas depth needs to be calculated (Offgas depth being a function of the Tissues Tension- primarily the first one).

The difference for the diver is that by applying GFs, a more precise series of deepstops can be obtained, based on the Tissue Tension - (The criterion driving the whole ascent).

Pyle's method, although practical and easier to use, is merely based on empirical observation, and therefore there is no way to check that tissue tensions do not exceed the M limits.

This especially becomes a real issue in depths deeper than 80msw.

Personally, I use GFs.

P.S. Sorry if my English is messy - not a native speaker