Rebreather World - View Single Post - From RG-UF/M....To RGU-2....And Beyond

DanDunfee · 6th November 2007, 17:25

Got in a couple more 12 ft pool dives with the RGU-2 Oxygen Module just before heading out to DEMA. Essentially all initial trials had been done in horizontal, ~ 0 to 30 degree, swimming attitude. Initial reports of good WOB were optimistic. Positive hydrostatic head drove gas thru the scrubber and down divers throat.....goood !! ..but exhale WOB was higher than desired. .

Most recent trials, mostly in ~ vertical attitude, found continued very goood inhale WOB, but the vertical exhale WOB was quite high, due to the same positive hydrostatic head that makes the inhale WOB so effortless. To me, the exhale WOB is not acceptable for routine, and especially longer dives (fatigue). The initial scrubber & counterlung configurations are being modified.

Changing internal scrubber canister flow & porting.... and counterlung shape ...to better balance the inhale / exhale WOB components. Both are minor physical detail changes, but expected to have substantial effects. Plan to go to Key Largo, Florida for first open water trials the end of November..... Will report after...

Dan

6th November 2007, 17:25	#49 (permalink)
DanDunfee Custom Title Allowed! Current Rebreather/s: Other CCR Other SCR Home Build Other Rebreather/s: Not Bought Yet Other CCR Other SCR Home Build Join Date: Sep 2005 Location: Virginia, USA Posts: 204	Re: From RG-UF/M....To RGU-2....And Beyond Got in a couple more 12 ft pool dives with the RGU-2 Oxygen Module just before heading out to DEMA. Essentially all initial trials had been done in horizontal, ~ 0 to 30 degree, swimming attitude. Initial reports of good WOB were optimistic. Positive hydrostatic head drove gas thru the scrubber and down divers throat.....goood !! ..but exhale WOB was higher than desired. . Most recent trials, mostly in ~ vertical attitude, found continued very goood inhale WOB, but the vertical exhale WOB was quite high, due to the same positive hydrostatic head that makes the inhale WOB so effortless. To me, the exhale WOB is not acceptable for routine, and especially longer dives (fatigue). The initial scrubber & counterlung configurations are being modified. Changing internal scrubber canister flow & porting.... and counterlung shape ...to better balance the inhale / exhale WOB components. Both are minor physical detail changes, but expected to have substantial effects. Plan to go to Key Largo, Florida for first open water trials the end of November..... Will report after... Dan __________________ There are 'Bold' divers and old divers, but NO old, ' Bold ' divers Last edited by DanDunfee : 7th November 2007 at 04:26.
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