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Old 1st November 2007, 14:22   4 links from elsewhere to this Post. Click to view. #1 (permalink)
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Thumbs up rEvo - The good and the Bad (by a newbie)

Ive now been diving the rEvo for some months. And I absolutely love it.
I'm at that stage where, I just want to tell every newbie to buy one....

Instead of screaming that the rEvo is the one true religion, I have listed all the positive sides and all the negative sides the I can think off. Then people can read for them selves, and judge for them selves.

I'll give the conclusion first:
If everything was stolen, and I had to buy a new Rebreather today, I would call Raymakers without hesitation. I really like the concept, and it works in real life on a hard ALU-rib in cold Danish waters too.

-----

The list below is of all the things I like about the rEvo.
Each item is ofcourse subject to personal interpretation, and you are all welcome to add more points or discuss my list. I write this because I want to commend Paul Raymaeker and his wonderfull little machine. I will however also post a listing below of all the negative sides because some of the design choices i do not agree with. Some of the points are tradeoffs and will be listed on both positive and negative listing.
The points listed below are not nessecarily unique, but something I personally
value in my toy. So here we go, in no particular order:

Pos#001: rEvo comes completely ready to dive - and I am still diving it in stock config.

Pos#002: rEvo includes hose-weights and hosecovers, for nice balanced DSV-trim.

Pos#003: The rEvo is built out of strong heavy materials, wich keeps weight off your belt, and makes your total setup lighter. It also makes the Rebreather sturdy.

Pos#004: rEvo uses two small scrubbers in serial, giving an optimum use of sorb, while retaining good safety since 50% of sorb is changed every 2 hrs or less.It also provides safety against channeling, since the gas is mixed between the scrubbers - very innovative.

Pos#005: rEvo now has the possibility to upgrade to eCCR in various configs.

Pos#006: rEvo uses two completely independant PPO2-monitors with dual HUD. Allowing for 4 Cells in standard setup. I'm currently using 4 cells. Also allowing for redundant monitoring, where any one part can fail without you loosing the monitoing.

Pos#007: There are very few orings, and very few dynamic connections for the loop: Scrubberlid (4 orings), inhale hose, exhale hose. Very few points of failure, due to poor maintenance or user-error during assembly.

Pos#008: Inhale hose and exhale hose, are very simple to remove, and this allows for very simple two-point calibration-check: Calibrate in 100% O2, remove exhale-hose breathe through mouth-piece and verify PPO reaches 0.21%.

Pos#009: Unit is VERY compact and streamlined, especially compared to other BMCL-units.

Pos#010: PPO-monitors (rEvodreams) have no wetswitches or pushbuttons, making them robust (in theory).

Pos#011: PPO-monitors will run for 250hrs on one set of betteries (in theory?).

Pos#012: rEvo can be configred with various types of harnesses: Can be ordered with Diverite deLuxe, +QC or Transplate - other custom solutions can be adapted.

Pos#013: WOB is nice (but I have no comparison - so disregard).

Pos#014: Uses standard Apeks DS4 1st. stages wich are easy to maintain.

Pos#015: Uses a standard Apeks drysuit-valve as OPV, wich is easy to maintain.

Pos#016: If you're lucky it comes with 300bar cylinders - And I was lucky (note: Only 232bar valves though).

Pos#017: Changing scrubber is extremely easy (See youtube) - moreso than any other Rebreather I think.

Pos#018: Filling scrubbers is a breeze (IMHO).

Pos#019: Manual O2-add and dil-add is placed on Rebreather below tank-valves, keeping chest-area clutterfree, and making sure you can allways find the add-buttons.

Pos#020: Unit has integrated rigid lifthandle/protector, and can stand on its own.

Pos#021: rEvo uses BMCL, keeping chest-area free, and headmovements very unrestricted due to breathing-hose config.

Pos#022: Removing the Dil/O2 tanks is very easy, and replacing them likewise if done correctly.

Pos#023: rEvo has builtin side-attachmens, and is delivered with brackets for this (DSMB, Argon, Light etc.). They are easy to operate.

Pos#024: its an mCCR.

Pos#025: It comes with a very simple setup, so less chance for f**king up, when putting the kit together.

Pos#026: Cell-replacement is a breeze.

Pos#027: No ADV-shut-off necessary (KISS), since it is hard to trigger (if set so)

Pos#028: Total setup is very simple.

Pos#029: Total teardown after diving, practicly nothing more than hosing it down twice, less than 5mins. No more than I used on my OC-gear, except for bagging the scrubbers.

-----------------------------------------------------

The things that I dont like, some are design-tradeoffs, others can be changed by user. Some are just me being plain silly :o

Again this is my personal oppinion, and I only have some 34hrs on the kit.

Neg#001: The written manual leaves some things to be desired.

Neg#002: The P-port adapters seem very flimsy. They work allreight, but...
I still worry about them - but they work on rays, Dräger FFM etc, so why not here.

Neg#003: The OPV, is in the inhale-lung, wich means you cannot drain anything from exhale lung during the dive.

Neg#004: Water-trap capacity of exhale lung is not very good, causing overflow into scrubbers very easily (I've now learned to suck up my own drool, wich helps).

Neg#005: Moisture-absorber pad in lungs have no "good" place, I use one in exhale and stick it in left side (no description in manual - see #001).

Neg#006: When cells fail under water, you cannont tell wich cell it is if two are connected to the rEvo-dream. If error is not still present at surface you'll
have to guess (Happend to me twice - no bigge but still annoying - if rEvo-dream allways started with Cell_1 after a tap you would be abel to identify them). Only option is to turn off the damn thing underwater - and look during bootup - not a good idea.

Neg#007: rEvodreams often wake up during transport, as long as loop is air, they cannot calibrate by them selves, though they could change settings (Not a problem, and I prefer this design). It is also possible for them to turn off underwater, by accidental tapping - has not happend to me though.

Neg#008: No offboard connectors in standard config. Can be added though.

Neg#009: No OC-access to onboard Dil or O2. Can be added though.

Neg#010: No BOV - can be added.

Neg#011: Gas-addition in exhale, is not keyed, wich can cause it to rotate during transport affecting operation of ADV (has not posed a real problem for me).

Neg#012: Cells mount, in inhale-lung is not keyed, causing it to rotate during
transport, indirectly causing some cells to gather water on their membranes
(has not posed a real problem for me).

Neg#013: No ADV-isolator. and it has to trigger hard, since it otherwize will
trigger by turning head down. Not very good for flushing the loop, or SCR-mode. But helps keep volume down, and keeps O2 and Dil-use low

Neg#014: Scrubber-lid is soft, and scrates easily. I think this is by design to
insulate the scrubbers (Ie. foamy material).

Neg#015: even with small amounts of water in the lungs, if the rEvo is placed on its back it will enter the scrubbers. So dont place it on its back...

Neg#016: If the rEvo is rolled onto its back from upright position, the weight
(some 30kg) will roll onto the 1st-stages, causing mechanical stress on them and the hoses. So dont roll it onto its back... Could be solved by better bigger and stronger guards.

Neg#017: The simple 4-point tank-attachment are difficult to see if correctly placed (the two hooks on the inside). I sometimes get them attached wrongly. Just need to be a bit carefull and check as good as I can. It doesnt come off, even if not fully attached. (I still love the attachments, nothing like showing off to an inspo diver, messing about his kit. Before he has the lid off, you have stripped the unit )

Neg#018: The chest-strap on the diverite harness sucks.

Neg#019: Its heavy. I see this mostly as a strictly positive thing (see positive no #003). I also bought it thinking I would never bother bringing it with me on holidays.....
But now I want to do just that, because I just love diving it - damnit.
Solution: By titanium mini-rEvo with Carbon-fibre-tanks $$$$$ just for the
holidays....

Neg#020: Its not CE-approved. Never will be since no mCCR can be. Purchase was a bit tricky - mostly me driving from Venice to Villeneuve and back in one day due to a personal cockup!
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Old 1st November 2007, 15:45   #2 (permalink)
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Thumbs up Re: rEvo - The good and the Bad (by a newbie)

Nice write up. I've not seen one in the flesh yet but I still want one. In titanium. With a Hammerhead.
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Old 1st November 2007, 15:49   #3 (permalink)
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Re: rEvo - The good and the Bad (by a newbie)

I second that. I would definitely have considered the Revo if I still lived in France. Could be my second rebreather one day.

Have some green.
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Old 1st November 2007, 21:00   #4 (permalink)
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Re: rEvo - The good and the Bad (by a newbie)

Quote:
Neg#001: The written manual leaves some things to be desired.
That's why I've wrote a book :p

Neg#002: The P-port adapters seem very flimsy. They work allreight, but...
I still worry about them - but they work on rays, Dräger FFM etc, so why not here.[/QUOTE]
Dräger P-port connectors seems weak, but they work fine. I've use it on some home made breathers before the rEvo, and it's probably the only parts which have always works without pb.


Quote:
Neg#007: rEvodreams often wake up during transport,
Look if the pin which maintain batteries is enough tighten. When it not, contact can be loosed, and when it go back the rEvodream wake up (and go to sleep after some min in PpO2 < 0.5). I've seen some rEvo with this pb.
Setting can't be changed and calibration can't run by themselves.
When you change batteries you can see the rEvodream automaticly wake up.


Quote:
Neg#011: Gas-addition in exhale, is not keyed, wich can cause it to rotate during transport affecting operation of ADV (has not posed a real problem for me).
If you transport it with the cassette inside, it don't rotate. If you transport it without cassette, you look the system when you put the cassette.

Quote:
Neg#012: Cells mount, in inhale-lung is not keyed, causing it to rotate during
transport, indirectly causing some cells to gather water on their membranes
(has not posed a real problem for me).
Same than #11
I've made thousand and thousand of km in car with my rEvo and have not encounted that sort of problem.


Quote:
Neg#015: even with small amounts of water in the lungs, if the rEvo is placed on its back it will enter the scrubbers. So dont place it on its back...
I always put it on its back on a soft mat, and have never seen pb with water.
But it's possible to take the cassettes off during the transport. Tupperware can do the job for the cassettes -and for the sorb.


Quote:
Neg#017: The simple 4-point tank-attachment are difficult to see if correctly placed (the two hooks on the inside).
Just try to rotate the tank. If you can rotate even a little, the attachement is not correct.

Quote:
Neg#019: Its heavy.
Heavy ?
Less than many other breathers.
But your right, for travel, specially by plane, the carbo-titanium version is a must ! ;)
An other possibility is to travel without the tanks and rent it on the holidays place. Inspiration tanks fit the rEvo.
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Old 1st November 2007, 22:10   #5 (permalink)
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Re: rEvo - The good and the Bad (by a newbie)

Hi Hanssing.

Do you consider going down the Shearwater route and make it an eCCR? or are you a firm mCCR lad?

About the serial scrubbers - are there any papers or comparisons to other Rebreather? Find it strange that no one else uses this design if it is so good.

I too like the rEvo (only from what I've read) and have been considering it but I'm more drawn towards the Sentinel I think or upgrading my Classic.

CHeers

Soren

Last edited by Soren Thomsen; 1st November 2007 at 22:14..
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Old 1st November 2007, 22:31   #6 (permalink)
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Re: rEvo - The good and the Bad (by a newbie)

great, thx for the write up hannsing !
you forgot e reel important thing: the rEvo looks like a reel rebreather, not like the new LEGO-toy from sweden

J.V. : its possible to do the rEvo training in source de landenouse ?

salutations
mathias
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Old 2nd November 2007, 06:35   #7 (permalink)
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Re: rEvo - The good and the Bad (by a newbie)

Quote:
Find it strange that no one else uses this design if it is so good.
It's really pleasant to use. But for the manufacturer that's need to completly think the breather around the filter.
Design come from a medical system.
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Old 2nd November 2007, 06:40   #8 (permalink)
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Re: rEvo - The good and the Bad (by a newbie)

Quote:
J.V. : its possible to do the rEvo training in source de landenouse ?
Mmm, Landenouze is probably not the best cave for a first walk with a breather. But there is other place nearby, like Saint-Sauveur (the pool).
Landenouze, or le Ressel, is for the day after. :D

Last edited by J. V.; 2nd November 2007 at 07:13..
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Old 2nd November 2007, 07:58   #9 (permalink)
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Re: rEvo - The good and the Bad (by a newbie)

Quote: (Originally Posted by J. V.) View Original Post
That's why I've wrote a book :p
Have you? Where is it available?

Thanks
.
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Old 2nd November 2007, 08:11   #10 (permalink)
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Re: rEvo - The good and the Bad (by a newbie)

Editions Eugen Ulmer
in french only
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