Rebreather World - View Single Post - Maybe eCCR's really aren't the wave of the future for recreational divers?

**Dave Sutton** · 8th June 2007, 22:37

Quote: (Originally Posted by silent running)

Don't get me wrong, I'm sure that on average MCCRs are safer and more reliable and maybe you wind up with only a little more deco for having your PO2 wander all over the place.

Time for a reality check: PP02's do not "wander all over the place" on a mCCR, certainly not enough to add any deco. MANY THOUSANDS of mCCR dives have been done with non-integrated deco computers and/or cut tables. The normal deviations from "average desired PP02" (as there is no "setpoint") are *completely* irrelevent to deco obligations, and in fact average themselves out quite nicely over the time base of a dive. I'll be happy to show my VR-3 PP02 logs if I can ever figure out how to extract them from the damned thing.... maybe I'll just take some photos of the screen.

Guys: Simple = Good. Don't muck up an excellent and *simple* system by adding hugely complex electronics to the matrix. Stick to a pair of cells (3 max), isolate them into at least two independant packages, and go diving. All the rest is nonsense.

PP02 between 0.2 and 1.8? Be happy, your body is! (for a long while anyhow....)
PP02 between 0.8 and 1.6 with a deco calc based on 1.2? Be even happier!

It'll all average out in the end...........

Dave

8th June 2007, 22:37	#56 (permalink)
Dave Sutton Diveshop of Horrors Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Evolution Megalodon rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,907	Re: Maybe eCCR's really aren't the wave of the future? Quote: (Originally Posted by silent running) Don't get me wrong, I'm sure that on average MCCRs are safer and more reliable and maybe you wind up with only a little more deco for having your PO2 wander all over the place. Time for a reality check: PP02's do not "wander all over the place" on a mCCR, certainly not enough to add any deco. MANY THOUSANDS of mCCR dives have been done with non-integrated deco computers and/or cut tables. The normal deviations from "average desired PP02" (as there is no "setpoint") are completely irrelevent to deco obligations, and in fact average themselves out quite nicely over the time base of a dive. I'll be happy to show my VR-3 PP02 logs if I can ever figure out how to extract them from the damned thing.... maybe I'll just take some photos of the screen. Guys: Simple = Good. Don't muck up an excellent and simple system by adding hugely complex electronics to the matrix. Stick to a pair of cells (3 max), isolate them into at least two independant packages, and go diving. All the rest is nonsense. PP02 between 0.2 and 1.8? Be happy, your body is! (for a long while anyhow....) PP02 between 0.8 and 1.6 with a deco calc based on 1.2? Be even happier! It'll all average out in the end........... Dave __________________ "Silent Diving with No Bubbles and No Politics".... www.nobubblediving.com Last edited by Dave Sutton : 8th June 2007 at 22:41.
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