old frogman
Contributor
The copy I have (Australian version) which precedes yours is actually titled "The essentials of deep diving". Same book slightly earlier edition 1989.
What probabilistic modelling means is that the tables are tested by the US Navy in vivo. That is, many hundreds of dives are made by divers to see how many DCI cases occur. The US Navy is unique in this type of testing which is extremely expensive. A DCI percentage figure is arrived at, for example, 2%, 3 %, 5%, 7% etc. In relation to their current air tables 0-190ft the aim is to achieve a DCI of 3% or less across all depth and bottom durations.
While the first book by Lipmann may not use the word probabilistic. The US Navy have always tested their tables in vivo. However, the second book published later by Lipmann with Mitchell does make direct reference to the term probabilistic model. It also has a chapter on it.
If you want to delve deeper in US Navy probabilistic modelling, there is an unclassified document NEDU TR 04-40 "Graphical analysis: Decompression tables and dive outcome" Dec 2004.
Don't get too hung up on the DCI incident %. Look at it from the other perspective 97% or better chance of not getting DCI.
What probabilistic modelling means is that the tables are tested by the US Navy in vivo. That is, many hundreds of dives are made by divers to see how many DCI cases occur. The US Navy is unique in this type of testing which is extremely expensive. A DCI percentage figure is arrived at, for example, 2%, 3 %, 5%, 7% etc. In relation to their current air tables 0-190ft the aim is to achieve a DCI of 3% or less across all depth and bottom durations.
While the first book by Lipmann may not use the word probabilistic. The US Navy have always tested their tables in vivo. However, the second book published later by Lipmann with Mitchell does make direct reference to the term probabilistic model. It also has a chapter on it.
If you want to delve deeper in US Navy probabilistic modelling, there is an unclassified document NEDU TR 04-40 "Graphical analysis: Decompression tables and dive outcome" Dec 2004.
Don't get too hung up on the DCI incident %. Look at it from the other perspective 97% or better chance of not getting DCI.
