Posted by Kendall Raine on March 22, 2001 at 08:09:53:
In Reply to: Re: deep sim stops posted by Steve on March 21, 2001 at 22:42:02:
What Pyle says about reducing the shallow hang time by pulling the deep stops is actually reflected in the VPM and RGBM models. If you arbitrarily throw in a deep stop; however, you may see a small penalty. You need to compare VPM with Buelhmann to see this, not VPM to VPM as you seem to be doing.
Pyle's method of splitting the difference between the first "required" Buehlmann stop and the bottom, then halving that distance again for the next deep stop, isn't a bad start, but he wrote this article in 1995, guys. It was sledge hammer deco. The newer models define the deep stops as part of the whole picture making them less arbitrary-at least in theory. You really see this on the deep mix dives. For a mix dive to 250 for 25 minutes of bottom time, I now pull 30 minutes less deco than I did using a modified Buelhmann schedule-all of the savings coming off the shallow, 100% O2, stops, and save myself the lung damage of all that high PO2 exposure. Doppler bubble grades are pretty similar.