Deco software.

[Finless]

Originally Posted by stevechesh

With regard to deep stops, i've only got an old version of Proplanner (7.12C), although i can manually put in deep stops (not sure if the new software does it automatically).

Steve

Yes, it does.

[Darren555]

Just read the article in my local WH Smith library.
He does push the DecoChek software at the end.

[DIVE BUDDHA]

ive been playing with dos version of pro-planner today and it looks quiet a usefull tool !

i will have to spend the night playing with it !! deco check is a good tool too!!

best wishes and safe diving leigh

[wreckweasel]

Brian,

If you like buhlmann etc (which is essentially what your cochrane is) Zplanner can still be found for free on t'interweb.

for free vpm theres HLplanner.


/Z

[Finless]

Originally Posted by wreckweasel

Brian,

If you like buhlmann etc (which is essentially what your cochrane is) Zplanner can still be found for free on t'interweb.

for free vpm theres HLplanner.


/Z

This is the problem. I trust my Cochran because I've not been bent or, at least, I was not aware of it. This has included doing one 60 mtr dive on air and plenty in the 40 mtr range. What I don't know is if it is the best schedule for me.

I do feel very tired after diving but this could be any combination of factors - including I have an office job, I don't sleep well and the exercise and the fresh air from diving might make very tired.

Oh well, I'll stick with my good old Cochran Comander Nitrox.

TBH, I've never had a computer problem so I've never had to use my backup slate/dive timer to handle an ascent so, so far, the question is irrelevant. My Cochran doesn't do deep stops (although I believe the newer ones do) so I sometimes stick them in ...... if I can be bothered ......... if I remember ......... and I always do an extra 3 mins at 3 mtrs after my computer has cleared any deco.

I suppose there is no single correct answer as to which is the best deco schedule to use ........... even if anyone knew the answer to that question ones own body chemistry/physiology(?) on the day could screw things up.

Sadly, I'm not to keen on experimenting with different deco schedules on my own body so I'll probably just carry on as I am.

[JStop]

Firstly get one thing straight. Deco software attempts to model what happens in the body and is based on 1) some basic physical laws 2) statistical data derived from various experiments. They in no way predict the complexities of an individuals physiology or the way they behave on a particular day.

The majority of Deco software is based on the Haldanian model and in most general use the factors and constants derived by Buhlmann by experiment. There is also a great deal of other research (to many to mention) that has modified the original model over the years.

Buhlmanns data gives rise to a schedule that has a certain statisical risk of a decompression hit. I think 1 in 20 rings a bell. Buhlmann himself admitted that schedules using the basic algorythm were unsafe to use.

This gives rise to the many ways that the model is made "safer". These range from altering the M-Values, depth conservatism, altering on-gassing and off-gassing half-times, altering the inert gas pressure etc. etc. etc.

Erik Baker's GF modification is one I am particularly familiar with, as this is the one I programmed. This alters the M-Values in the equations to produce a slower ascent curve and in my opinion is a very good technique. IF you can find suitable factors for yourself.

DecoCheck has some very good points. It has taken M-Values and Half-times from many algorythms to achieve the combined 18 compartment model. It also was one of the first to look at Isobaric Counter diffusion. I thank Mark for the copy he provided for my last project.

In general I prefer the GF modification and so like DDPlan and GAP. The VPM and RGBM models seem too conservative for my style of diving.

The main concern I have in future diving is that the general model uses a 640min half-time as the slowest compartment. On deeper dives with rebreathers this is simply not long enough.

At the end of the day you pay your money and make your choice. If it works for you then stick to it.

Alternatively you can always choose the J-Stop algorythm

[Mark Chase]

Originally Posted by And

Hi

Interesting. You actually do a 4 minute longer runtime, and the deco seems to be very 'Haldanian' I guess, in that it is asking for a lot of time at 9 and 6 mtrs. There seems to be little consideration of deep stops in Proplanner, and it doesn't seem to acknowledge that perhaps a slower ascent might be required due to the helium.

It is a completely different approach to what I have been taught, but if it works for you ..?

Andy

I depends how you set it up. If you run 100% micro buble and 0 conservitisum

1@29
1@21
1@15
1@12
3@9
9@6
17@3

[rich Zed]

Originally Posted by Morg_NZ

Which issue is his article in??

on the website now..

http://www.divernet.com/cgi-bin/arti...action=display