Scubamedicjoe
Contributor
ok what size do you all use as a bail up bootle (back up ) for your wreck dives , and cave diving.
Bail up bottle Back up
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Ah, I remember my first "bail up bootle"
But seriously, when I was diving a single steel tank in wreck I used a slung 40cf bottle. Figured I'd have it when I eventually went more tech, which I did.
Pro's
- lots of extra gas in a 40cf vs 19, 13, etc
- slinging allows you to move it out of the way as needed in tight spots
- now a dedicate 100% O2 bottle
Con's
- uhh...
- umm...
- I got nothing...
iowasnowboarder
Registered
the other 130cf bottle in my set of doubles
DevonDiver
N/A
For penetration, I use a manifolded twin-set (doubles) and apply the rule of thirds for gas management.
You can use an independant stage/bail-out... but if you do, this should be of sufficient capacity for you to apply the same 'rule of thirds' to cover your egress from the wreck and ascent in the event of a catastrophic loss of gas from your single cylinder.
You can use an independant stage/bail-out... but if you do, this should be of sufficient capacity for you to apply the same 'rule of thirds' to cover your egress from the wreck and ascent in the event of a catastrophic loss of gas from your single cylinder.
OP
Scubamedicjoe
Contributor
ok a back up tank then when I doing normal every day wreck diving.. thinking of a 40
So far only 2 80s for cave...but I'm working on it
You can't go wrong with an AL40. Be sure and get a Luxfer and CylTec as they ride much better then Catalinas which tend to be too negative and don't ride well when slung.
A 40 isn't much bigger then a 30 (which is the smallest I'd recommend) but is much more usable later (if you go tech) or marketable if you decide to sell it.
I'd highly recommend you sling it like a stage instead of mounting it on your tank. If you're going to go the back-mounted option you might as well go to doubles.
A 40 isn't much bigger then a 30 (which is the smallest I'd recommend) but is much more usable later (if you go tech) or marketable if you decide to sell it.
I'd highly recommend you sling it like a stage instead of mounting it on your tank. If you're going to go the back-mounted option you might as well go to doubles.
Blackwood
Contributor
I dive luxfers (open water), but many people prefer Catalinas for penetration since they don't float way up when empty.
If he's penetrating anything, I sure hope he goes with doubles instead. IMO a pony only makes sense for deepish, recreational, open water diving. If you're going deeper, colder or inside anything, doubles are the only way to go.
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