abyssalblue
Registered
Can someone explain to me why this deco model is so popular/desireable?(In simple terms) Thank you.
Todd
Todd
Rgbm?
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BRW on this board.
He is the author and has posted a lot of information and explanation in a few threads here.
He is the author and has posted a lot of information and explanation in a few threads here.
Charlie99
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A good model agrees closely with real world experience. The bubble models such as VPM and RGBM that track both dissolved gases and free phase (bubbles) agree with real world results better than the older models which consider dissolved gases only (Haldane, neo-Haldande, Buehlmann, etc.).
This doesn't mean, however, that the old models are useless.
Newtonian mechanics don't predict various relativistic effects that Einstein predicted and which have been experimentally verified. For everyday use, however, simple Newtonian physics are "close enough".
This doesn't mean, however, that the old models are useless.
Newtonian mechanics don't predict various relativistic effects that Einstein predicted and which have been experimentally verified. For everyday use, however, simple Newtonian physics are "close enough".
LOL. Love it!! Still got to watch out for those apples then!Charlie99:
Wally1716
Contributor
Charlie99:
...
That basically explains it. They both bring new ideas to the deco theory which have been proven to exist.
That's why they have become so popular in the techie field. Recreational tables still have a long track record
in their field.
As to why is the VPM so much more popular than RGBM, PM me for that info as I am not going to get involved
in a mud-slinging debate.
Oh yes, forget about the Newtonian mechanics....;-)
Charlie99:
Todd,
Just to clarify a little what Charlie means:
Bubbles form on pretty much every dive. Older deco models calculate the "minimum" depth (called a ceiling) to which you can ascend without getting clinical (noticable) symptoms of DCS. To perform a deco you would go to your ceiling, wait, go the next shallower ceiling, wait again and so on. Some people call this a "bend and treat" approach because you basically cause some bubble formation and then wait until it goes away before ascending further.
RGBM has a different approach. RGBM is designed to avoid the *formation* of bubbles by essentially slowing the ascent and starting deco much deeper than traditional models. By avoiding the formation of bubbles, you also speed up the deco because the extra gas (nitrogen/helium) will exit your system more efficiently before it forms into a bubble. Bubbles take longer to eliminate.
That's basically the difference.
In practice these differences become significant once you go over your NDL. In the case of no-stop diving the differences are minor.
R..
MonkSeal
Contributor
Diver0001:
You meant helium
H2Andy
Contributor
would give the term "blowing your deco" a whole new meaning
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