Rebreather,wreck,stages,deco

AD_ward9

Thanks very much. You are on. If you could send me an email with contact details that would be great.

Thanks also to Bruce. I will try and get over before the Spring. January perhaps? Any update on how close is "right next to"?

Cheers,
Alex

surgeondress

surgeondress

As an addendum, I ran additional V-planner numbers for the same dive, but with EAN32 and 100% O2 for OC bailout at the end of the prescribed bottom time on CCR, and this significantly decreased the deco obligation allowing the diver to sling 2 aluminum 40's for these gasses (which are more maneuverable and manageable anyhow) with adequate reserves of each, assuming neither are lost:

DIVE PLAN
Surface interval = 5 day 0 hr 0 min.
Elevation = 0ft
Conservatism = + 2
Dec to 110ft (2) Diluent Air 0.40 SetPoint, 50ft/min descent.
Level 110ft 57:48 (60) Diluent Air 1.20 SetPoint, 98ft ead
Asc to 40ft (62) Nitrox 32 -30ft/min ascent.
Stop at 40ft 2:40 (65) Nitrox 32 0.71 ppO2, 30ft ead
Stop at 30ft 7:00 (72) Nitrox 32 0.61 ppO2, 21ft ead
Stop at 20ft 3:00 (75) Oxygen 1.60 ppO2, 0ft ead
Stop at 15ft 12:00 (87) Oxygen 1.45 ppO2, 0ft ead
Stop at 15ft 1:00 (88) Oxygen 0.50 (1.45), 0ft ead
Surface (88) Oxygen -30ft/min ascent.
Off gassing starts at 70.7ft
OTU's this dive: 109
CNS Total: 44.4%
19.2 cu ft Nitrox 32
13.4 cu ft Oxygen
32.6 cu ft OC TOTAL

Take care.
Chris Dress

jradomski

Personally for bailout I never cary oxygen as a bailout.. 50% is a much better choice.. If you decide to carry oxygen you have to insure you carry adequate bottom gas reserve.. and if you have a problem with your bottom bailout your screwed.. at least with 50% you only have to get to 21m (70 fsw) to use it.. If you HAD to you could get on the 50% at 100fsw as long as you were ascending.. If you had oxygen as you deco gas you have alot of swimming to do to get it to a usable depth, and blowing that mnay deeper stops is not a good thing..

Oxygen on this dive only has negatives..

__________________
Joe Radomski
CCR Trimix Instructor Trainer
ANDI Instructor Trainer Director #10

All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated.

s75952004

thanks surgeondress
the main reson for asking ? is to learn ,when I do get the training and Rebreather .I need to know how much more equipment I need. as for this wreck goes ,they made it realy diver friendly ,with holes cut every 30 feet and with white letters saying open this way .
I also tend to use alot of air ,that is one reason a Rebreather apeals to me .why did you chose the optima over some of the other brands?

surgeondress

Joe,

Thanks for your response. I agree, I wouldn't carry 100% O2 normally for bailout either for reasons you give. I presented those numbers strictly to exemplify another bailout option for s75952004, and how a program like V-planner can aid in dive planning.

Chris

surgeondress

s75952004, there are several other available units out there, but I chose to pre-order the Optima for a number of reasons:

1. It is the first unit to be produced by a large, respected U.S. company with an extensive dealer support network. Although only certain dealers will be authorized to sell it.
2. Cost is reasonable, since Dive Rite Express is charging $6900 with no tax (outside FL), AND it included free harness/wings, free trimix option, and free shipping if it was ordered prior to 15 Oct. This is higher than the original $5000 I was told by Lamar a year and a half ago, but not unexpected.
3. Prototype testing has been done for a long time and each report I've gotten is very good WRT performance of the unit and scrubber at depths of up to 300 ft.
4. Integrated deco and trimix capability on the Hammerhead electronics. Plus DIVA HUD.
5. I like the Extendair cartridge option personally--granted the test data was originally only released at 1 and then 5 atm. New data is to be released soon. The cost is higher than sorb and they are bigger and bulkier to transport, but I'd rather take the old one out and pop the new one in. Takes about a minute, as opposed to filling and tapping, tapping, tapping. Decreased chance of channeling, caustic cocktails, and works well even when flooded per all reports. Give me simplicity, and take the user error factor out of the equation.
6. Clean, sleek look. Hope the fabric cover holds up to punishment, but it is guaranteed.
7. 61 lbs loaded! With bailout, that is half of what I'm strapping on to dive OC now.
8. Automatic Diluent Valve standard.
9. Farallon loop very flood resistant.
10. Battery user replaceable, very long Saft life, and not located in the head.
11. Redundant handsets and setpoint controllers.
12. 25 lb. transport weight as carryon luggage.

I'm sure I've forgotten some other reasons why I chose the unit. And God knows, Dive Rite is already 5 months late on their original ship date, but good things take time, albeit I'm not a very patient individual.

Chris

s75952004

thanks
I agree dive rite is excelent company.
I still perfer the evolution size wise ,does cost more for me us10,000,then exchange.
as I am a rookie I can not comment on the scubber canistor vers packing sorb.maybe osme of the vets can shed some good info

surgeondress

I looked at the Evolution pretty closely, but it has a rather short scrubber duration and this would limit the type of cave and technical diving I do now on OC. It seems like a great unit for recreational rebreather diving though.

chris

schford

I rather doubt that the Optima scrubber would have much more run time than the Evolution if tested to CE standards.

Plus with the Evolutions scrubber guage you get real time monitoring of scrubber utilisaiton which effectivly would give you more run time than the Optima.

I know a bunch of people who dive them to 100m plus and have ample run time from the scrubber on a single dive...

Stuart