It appears you have not yet registered with our community. To register for free click here
Rebreather World
       

Go Back   Rebreather World Rebreather Models, Design, and Accessories CCR - Closed Circuit Rebreathers Innerspace Systems Corp. Megalodon Rebreather

Reply
 
Thread Tools Display Modes
Old 5th June 2008, 14:57   #1
paintedfrogfish
RBW Member
 
paintedfrogfish's Avatar

 
Join Date: Dec 2007
Location: Singapore
Posts: 14
paintedfrogfish is on a distinguished road paintedfrogfish is on a distinguished road
Bailout bottle size

Hi all, What size bailout bottle do you guys recommend for recreational diving up to 40m? I am fed up with renting bottles as it's getting expensive! One issue is that I am considering getting trimix certified for my meg in the next few months. What bailout bottle should I buy then if this is the case? And should it be oxygen cleaned? I was considering a 13cf (or 5.5litre) bottle. Thanks. Marcus
(Offline)
 
Reply With Quote
Old 5th June 2008, 16:12   #2
Karsten_DK
RBW Member
 
Karsten_DK's Avatar

 
Megalodon SW
Join Date: Mar 2007
Location: Denmark
Posts: 16
Karsten_DK is an unknown quantity at this point
Re: Bailout bottle size

Im using a 7.0L Alu, 02 clean. for most of my diving untill 50m.

Last edited by Karsten_DK; 5th June 2008 at 16:16..
(Offline)
 
Reply With Quote
Old 5th June 2008, 16:26   #3
Jim
RBW Member
 
Jim's Avatar

 
MEG 204
YBOD Classic
Join Date: Jun 2005
Location: Bedfordshire, UK
Posts: 169
Jim is just really nice Jim is just really nice Jim is just really nice Jim is just really nice Jim is just really nice Jim is just really nice Jim is just really nice Jim is just really nice Jim is just really nice Jim is just really nice
Re: Bailout bottle size

Steel 7s to 45m & Ali 11s after - on the deeper stuff it won't be enough anyways so invariably dive as a team.

Various threads on bailout mixes and amount of gas on this board elsewhere.

Carry as much as you can, most seriously underestimate how much will be needed until it's needed !!! Try switching your computer over to a bailout mix at depth or on a long deco ...... make sure you are wearing nappy at the time !!
(Offline)
 
Reply With Quote
Old 5th June 2008, 16:30   #4
Humuhumu
Yellow Box Of Delight
 
Humuhumu's Avatar

 
Inspiration Vision
Dolphin (SCR & mCCR)
Join Date: Jan 2007
Location: France
Posts: 206
Humuhumu is an unknown quantity at this point
Re: Bailout bottle size

I use the internal diluent cylinder (3L) for no Deco dives (Auto Air regulator on the jacket of the Inspiration), eventually I carry a small 2L cylinder more with a separate regulator and this up to 40M. I have a 6L steel cylinder of course O2 clean for Deco dives up to let's say 45/50M. Deeper I use a S80 aluminum cylinder also O2 clean (Luxfer is always O2 clean, so keep it clean . Personally, I do no dives for the moment that needs more bail out than one S80. Deeper you should consider an asymmetric bail out strategy.

If you intend to do Trimix you should consider a S80 or 2*S80 plus a 6L (steel) or 7L (aluminum).

I hope this helps !

Cheers

Humuhumu

Last edited by Humuhumu; 5th June 2008 at 16:33..
(Offline)
 
Reply With Quote
Old 5th June 2008, 16:36   #5
PaulTG2
RBW Member
 
PaulTG2's Avatar

 
Join Date: Mar 2006
Location: Virginia, USA
Posts: 641
PaulTG2 is a name known to all PaulTG2 is a name known to all PaulTG2 is a name known to all PaulTG2 is a name known to all PaulTG2 is a name known to all PaulTG2 is a name known to all PaulTG2 is a name known to all PaulTG2 is a name known to all PaulTG2 is a name known to all PaulTG2 is a name known to all PaulTG2 is a name known to all
Re: Bailout bottle size

Hello,

What I see most often in the situation you described, 40m at 10min deco on a RB, is a 40cf aluminum cylinder with dilluent accessable for OC.

I've been diving with a 30cf for OC and 40m rebreather diving. Going deeper I'll likely move to a 40cf with a 24cf dilluent and 13cf OC accessible O2 bottle When I go to trimix I'll move to a 40 for bottom/travel mix and use the 30 for deco gas unless depth/deco demands otherwise.

Sincerely,

-p
__________________
Paul's first law states that the safety of an activity is determined by how forgiving of mistakes the activity is.

Paul's second law states that the difference between an adventurer and an explorer is whether the doing or the learning comes first.

"Don't be surprised if at the center of every hurricane in your life is an "I"." --paul gernhardt
(Offline)
 
Reply With Quote
Old 5th June 2008, 16:51   #6
venom
New Member
 
venom's Avatar

 
Join Date: Apr 2007
Location: malta
Posts: 29
venom is an unknown quantity at this point
Send a message via MSN to venom
Re: Bailout bottle size

so i started with a 4 lt but i always rested assured because i had the buddy air with me ...UNTILL ...lol...i flooded a lund and inhaled water. i had my bail out but beacuse i always kept in mind that i had my buddy air with me that is the firstthing that i took in my mouth.

it was a relaxed ascend from 20 mt with a wall. upon resurfacing i was left with only 40 bar in my diluent from almost 200 bar.

that same day i took away the buddy air.

then started diving with two 4lt.

then i tried to do a controled ascent from 40 mt doing all deep stops with my bailouts and thought again for two 6 lt.

now i ended with two 10 alu.

some might say that it is big but i prefer diving with one upto 40 mt...which i always have some deco to do and use both on deeper dives.

whilst renting i think that the best thing to do is try different tanks to see how they feel but it is never enough especialy if doing deep dives.


what i will be thinking is to get two 9 lt carbon fibre 300 bar. still have to try them out but with 300 bar it would be as if they were a 12 lt.

already found a nice site selling them ...lol

what i need is to get the cashhhhh for them.
(Offline)
 
Reply With Quote
Old 5th June 2008, 17:41   #7
David Pye
CK#69
 
David Pye's Avatar

 
Join Date: May 2006
Location: Newcastle Upon Tyne
Posts: 435
David Pye is a jewel in the rough David Pye is a jewel in the rough David Pye is a jewel in the rough David Pye is a jewel in the rough David Pye is a jewel in the rough David Pye is a jewel in the rough David Pye is a jewel in the rough David Pye is a jewel in the rough
Send a message via MSN to David Pye
Re: Bailout bottle size

I have two bailout bottles.

I've got an ali 7 litre (200 bar) with Nx 28 in it. It's breathable at 45m (if a bit hot). That will get me out of most things with minimal deco.

I also have an ali 40cu ft bottle with Nx 80 in it. I wouldn't take this unless I thought I'd have >20mins of deco to do if I bailed out.

David
(Offline)
 
Reply With Quote
Old 5th June 2008, 17:49   #8
jkaterenchuk
RBW Member
 
jkaterenchuk's Avatar

 
HammerMeg
Kiss Classic, Inspiration
Join Date: May 2006
Location: PA
Posts: 2,942
jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute
Re: Bailout bottle size

Quote: (Originally Posted by paintedfrogfish) View Original Post
Hi all, What size bailout bottle do you guys recommend for recreational diving up to 40m? I am fed up with renting bottles as it's getting expensive! One issue is that I am considering getting trimix certified for my meg in the next few months. What bailout bottle should I buy then if this is the case? And should it be oxygen cleaned? I was considering a 13cf (or 5.5litre) bottle. Thanks. Marcus

Why not sit down and use your RMV and the depths you might dive and do the calculations for yourself? You must have been shown how to do them if your taking a trimix course soon.

If you send me your email address I can forward a worksheet and guide to assist.

John
(Online)
 
Reply With Quote
Old 5th June 2008, 18:02   #9
Steve Schultz
Nearly Bubbleless
 
Steve Schultz's Avatar

 
Halcyon RB80
Join Date: Oct 2007
Location: Ottawa, Canada
Posts: 498
Steve Schultz has a reputation beyond repute Steve Schultz has a reputation beyond repute Steve Schultz has a reputation beyond repute Steve Schultz has a reputation beyond repute Steve Schultz has a reputation beyond repute Steve Schultz has a reputation beyond repute Steve Schultz has a reputation beyond repute Steve Schultz has a reputation beyond repute Steve Schultz has a reputation beyond repute Steve Schultz has a reputation beyond repute Steve Schultz has a reputation beyond repute
Re: Bailout bottle size

Quote: (Originally Posted by jkaterenchuk) View Original Post
Why not sit down and use your EMERGENCY RMV and the depths you might dive and do the calculations for yourself?

I agree 100% with what you said, but with a minor change in bold above.

Why would someone carry the same amount of bailout as a stranger on the internet who likely has a different RMV??
(Offline)
 
Reply With Quote
Old 5th June 2008, 18:06   #10
jkaterenchuk
RBW Member
 
jkaterenchuk's Avatar

 
HammerMeg
Kiss Classic, Inspiration
Join Date: May 2006
Location: PA
Posts: 2,942
jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute
Re: Bailout bottle size

Quote: (Originally Posted by se2schul) View Original Post
I agree 100% with what you said, but with a minor change in bold above.

Why would someone carry the same amount of bailout as a stranger on the internet who likely has a different RMV??
Thanks, I was assuming (maybe incorrectly) that the OP would know enough to arrive at an RMV that they felt comfortable reflected what they might use in an Emergency situation as well as adjusting for depth when calculating.

John
(Online)
 
Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On



All times are GMT. The time now is 08:18.


RebreatherWorld.Com 2005 - 2013
Rebreather World, RBW and the Rebreather World Logo are Trademarks
All rights reserved, no republishing of content without written permission.
By using this website you have agreed to our Terms & Conditions of Use

free counters