GUE Deco Planner profiles added. Playing with the program I discovered several UI bugs never solved during all these years. A clear demonstration of OS model superiority. Anyway... I corrected some typos in the spreadsheet.
I'm seeing some great discrepancy on multilevel and repetitive dives. Really I don't know if it's a DP bug. My question: does it make sense testing a bounce dive as 10'@100m. I think it's like play dice. isn't it? it worth copying here an excerpt of DP user manual about repetitive dives (I'm under the impression it was very experimental...) Repetitive Dives DecoPlanner allows the user to plan repetitive dives over any period. The theory behind repetitive dives is based on Bühlmann’s pulmonary shunt model. During a surface interval, gas elimination is delayed due to the pulmonary shunt mechanism; the gas loading remains higher than a normal set of calculations would conventionally calculate. Accordingly, on repetitive profiles, it will mean either less no-stop time or longer deco time. DecoPlanner runs gas-loading calculations for all the compartments on a continuous basis, which may cover days or even weeks! The gas loading is calculated and updated within a mission and are calculated according to what the diver is doing (surface interval or diving). At the end of the first dive of a mission (i.e. after all decompression), each compartment will have a certain loading of helium and nitrogen. Generally, after oxygen decompression, the fast compartments will be completely empty of helium and nitrogen and they will on-gas with nitrogen during the surface interval! The slowest compartment, 635 minutes for nitrogen, takes over two and a half days to completely off-gas, so any repetitive dive will halt that process. Until a better implementation of the pulmonary shunt model is developed, DecoPlanner behaves as if the surface interval is at one metre, breathing 21% (i.e., air), and as such the tissues never clear completely; once a surface interval of three to four hours is exceeded the penalty on the subsequent dive is the same whether the diver waits four or 24 hours. Repetitive VPM [Adapted from an original document written by Yount, Maiken, Baker] At the start of a first dive, if the diver has not been diving for a few weeks, the radial distribution of gas nuclei or “bubble seeds” in the body is assumed to be pristine. In other words, the radial distribution is the same in all tissue compartments and has its long-term equilibrium values. During ascent or decompression on the first dive, the supersaturation gradients in each compartment may be relaxed (increased) by the VPM dynamic critical volume algorithm to allow Nactual versus Nsafe number of bubbles to form. This causes dispersion in the radial distribution of gas nuclei across the various tissue compartments. To compensate on a repetitive dive, the VPM adjusts the minimum initial radius of gas nuclei in each compartment by an amount proportional to the dispersion that took place on the previous dive. _______________________________________________ subsurface mailing list [email protected] http://lists.subsurface-divelog.org/cgi-bin/mailman/listinfo/subsurface
