Dilemma. Would you post?

[Gav]

The only thing I would add to the "publish with appropriate caveats" is that some of us don't even know what DOTF is so maybe an explanation of the various methods would be useful?

[Woz]

Ratio deco in a single sentence:

"For a set of standard breathing gases, for every minute of bottom time you do, you do a corresponding number of minutes of decompression which is multiplied by set multiplication factors at set depths which can be interpolated for intermediate depths."

There you go. All done. Everyone back to bed.

[GLOC]

Originally Posted by Woz

Ratio deco in a single sentence:

"For a set of standard breathing gases, for every minute of bottom time you do, you do a corresponding number of minutes of decompression which is multiplied by set multiplication factors at set depths which can be interpolated for intermediate depths."

There you go. All done. Everyone back to bed.

Thanks Woz.

[Mal Bridgeman]

Originally Posted by Mark Chase

Flippant response? Arrogant rubbish.


ALL deco relies totally on pre determined gas choice, controlled ascent rates and use of high PP02s and/or gradients.

DOTF is just ratio deco and it requires no special skills outside those needed for any deco diver to do any type of deco. Any one practicing any sort of deco should have received adiquate training. Had i wanted to run DOTF on my TDI deco procedures course, I could have done.

So yes publish and be dammed.

If you want to make it interesting do a side by side for a DOTF profile and a 20/80 profile across two or three run times at max Tech1 range.

That will raise a few eyebrows.


ATB

MArk Chase

Mark

I am quite offended.

I have not implied that there is anything special or magic about Ratio Deco (btw I understand DOTF is something different) nor have I denigrated anybody else's training or systems.

The question I asked Garf would be equally valid if I asked you to, in a short paper on tinternet, explain how to dive a Rebreather.

Unless a paper is written that covers the topic sufficiently robustly then it shouldn't be in a paper and is best delivered by a trainer who can check understanding and explain in greater detail where something is not understood. A short paper on a complex subject cannot do that.

So please re-read what I actually wrote rather than what you thought I wrote.

Rgrds
Mal

[Janos]

Originally Posted by Mal Bridgeman

I have not implied that there is anything special or magic about Ratio Deco (btw I understand DOTF is something different) nor have I denigrated anybody else's training or systems.

The question I asked Garf would be equally valid if I asked you to, in a short paper on tinternet, explain how to dive a Rebreather.

I disagree. Diving a rebreather involves many practical skills, which are best taught by active demonstartion.

Ratio deco is 'just' a physical theory, a set of formulae. People learn Quantum Mechanics through correspondence courses. Ratio deco is far, far, far simpler.

Janos

[Janos]

Originally Posted by Woz

Ratio deco in a single sentence:

"For a set of standard breathing gases, for every minute of bottom time you do, you do a corresponding number of minutes of decompression which is multiplied by set multiplication factors at set depths which can be interpolated for intermediate depths."

But you're missing the definitional things:

1) "Deco" does not include deep stops
2) You need to add on an extra 5 minutes to get from 6m to the surface.
3) You need to use standard gases
4) You use average depth on the bottom
5) Do not include the descent time in bottom time
6) There's probably more. I can't remember what.

Janos

[Woz]

Janos, my old porky chappie, I was simply defining ratio deco, not explaining how to do it. In the same way a dictionary defines "quantum physics" without making you do a doctorate.

[Letz]

Being a wee "doing it the way I reckon works for me, in the current environment, at this stage in my diving" person and taking an interest in other methods, thoughts and opinions it could be considered a sensible and useful thing to post after, the most interesting, "Challenge Digger" thread and the exposure to 'Diggeroos'

I look forward to ploughing through it and await the next one on Wozzeroos and diving in mercury


We're all grown ups here (I think) and should have the sense to read, examine, investigate, consider and work out for ourselves.
No one should take any kind of blanket advice, without due consideration etc., anyway

[Woz]

If we all followed everything we read then we'd be getting rid of those nasty octopuses and fitting Air 2 to our BCD's...

[Mark Chase]

Originally Posted by Mal Bridgeman

Mark

I am quite offended.

I have not implied that there is anything special or magic about Ratio Deco (btw I understand DOTF is something different) nor have I denigrated anybody else's training or systems.

Well thats how it reads. Perhaps it was worded wrong. I read it and got an instant flash of anger at the insinuation that "other" forms of deco didnt require special skills.

The question I asked Garf would be equally valid if I asked you to, in a short paper on tinternet, explain how to dive a Rebreather.

I would be happy to write a short paper on the internet and i even did a short video on this very subject thats free to view. However any kind of detailed piece on diving CCR would be quite a lot of work. DOTF by comparison is a small subject.

I have done two short pieces on deco already and a piece on line laying. They are on a similar level with an article on DOTF to Tech1.

Actualty come to think of it I have already done a piece explaining DOTF as well but I havent had the benifit of Tech1 training so id like to see a diferent take on it.

Unless a paper is written that covers the topic sufficiently robustly then it shouldn't be in a paper and is best delivered by a trainer who can check understanding and explain in greater detail where something is not understood. A short paper on a complex subject cannot do that.

So please re-read what I actually wrote rather than what you thought I wrote.

Rgrds
Mal

Sorry Mal DOTF theory is not IMHO a complex subject and it can easily be explained on a few pages of A4.


ATB

Mark Chase