RECY'01 Tear Down

Louby Lou

Hi Folks

George aka gtzavelas has kindly said we could reproduce his article on the RECY'01 SCR. The article can be found in the Rebreatherworld Library HERE.

The RECY'01 is a Respiratory Minute Volume Keyed (RMV-Keyed) Passive Addition Semi Closed Rebreather.

Thanks again George

If you have any comments, questions or feedback please drop them on this thread and if you would like to leave feedback for George please use the links on the righthand side of the article.

Cheers

Miss Lou

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gtzavelas

Lou - thanks foe the help!

some additional comments regadring the RECY:




I had been thinking about getting a rebreather for quite some time. My diving is mostly cave diving down to -80m (so far!)

After long consideration I decided to go for a Gas Extender RECY 01 . The reasoning behind it was:

-Start of with a “simpler” and “safer” machine (compared to a CCR). In fact the Gas planning is very similar to OC (regarding to gas planning, switching, deco etc..)
-considered that it is sufficient for the diving I do now (usually up to 60 - 70 meters)
-considered as a good starting point to get into the rebreather world
- found a fair deal (second hand unit from someone I knew and trusted).
- proven record of these type of rebreathers in cave diving (some nice records set with this type of units)

So after 50 hours here are my thoughts:

• Reliability (+): even better than expected: the machine is bullet proof, can even be used as a ladder or a seat in the cave
• Safety (+): It is very important to have a good “feel” listen/feel the Gas injection and listen the gas being dumped. Assuming the above plus having an O2 meter makes this device VERY safe INHO. Most of the failures modes are “safe” apart from the one way valve that would lead to a hypoxic mix.
• Efficiency (-) : a bit disappointed: the theoretical 1 to 7 ration has never been achieved, not ever close… The best so far is 1 to 4 (max. 1 to 5). This means that you still need a lot of gas for 100m dives…
• On the other hand the other big advantage is that I can now use much higher He (++) content with out emptying my pocket…I did my first Heliox dive and have started to realize the huge benefits…
• Transportation inside the caves (++) The RECY can be broken down in parts and transported to the sumps with great ease.
• Deco ( - -). The deco calculations are a bit tricky as the mix changes with depths. This means that you have to be very conservative. I just got an HS explorer with an O2 port so this is simplified but it is still tricky to keep track with back up tables.
• Planning (-) because of the FO2 variation with depth you need a LOT of deferent mixes to dive deep.
• WOB (-). I don’t have experience with other RBs so can’t really compare it. But I can definitely confirm what is said about these type of RBs: it is really hard to breathe on the vertical (head up or down) position. This can be a problem when going up/down in chimneys…

Bottom line: very happy with the unit but already have started looking for the next step… But have not yet made up my mind between mCCR and e CCR…

I still consider that this type of Rebreather (with all the limitations it has) is safer than mCCR and eCCR…To be honest I am quite troubled with the large number of eCCR accidents. What is more disturbing is the lack of concrete evidence regarding the cause of the accidents…