Threads like these do not start well and end worse.
pony bottle options
- Thread starter scoobert
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To be fair "going really deep" is realatve, for someone that is used to go down to, let's say, 16 feet, 49 feet can be really deep, and still within his certification.
A pony bottle on those depths for recreational diving seems to me to be unessesary, since on those depths you should be able to do a nice CESA on one breath of air or the 20 breath of air that a spare air provides. I am not experiensed enough to give advice about pony bottles and CESA though.
A pony bottle on those depths for recreational diving seems to me to be unessesary, since on those depths you should be able to do a nice CESA on one breath of air or the 20 breath of air that a spare air provides. I am not experiensed enough to give advice about pony bottles and CESA though.
Last edited:
Roman_66
Contributor
Good question, according to topic starter previous posts :
Let's do simple math (sorry for metric, it is more easy for me):
I will calculate emergency air use as 30 liters per minutes. When diver out of air it is EMERGENCY, but let assume that topic started in perfect physical and mental condition (as solo diver should be, I think) and uses only 20 liters per minutes in emergency case.
"Water" size of 13 cf is 1.9 liter and it is allowed to be filled 207 bar, so total maximum volume is 1.9 x 207 = 393 liters
Due he plans "normal" ascending, I believe it means with safety stop and not faster than 9 meters per minutes.
Safety stop 3 minutes on 6 meters takes 20 x 1.6 x 3 = 96 liters
393 - 96 = 297, so maximum average deep is 8.2 meters, so maximum deep is 16.4 meters.
8.2 x (16.4/ 9 ) x 20 = 298.8 liters
As you see I calculated all numbers above as maximum good as possible, due in diving we calculate with reserve.
So safe deep for out of air situation with 13 cf tank is maximum 10-12 meters, which is about 35-40ft.
Deeper than 40 ft, you for sure will need to miss at least safety stop and probably ascend faster, which may cause for issues, that you try to prevent
I will not go solo even for this deep, as I believe that
is your buddy.
Hope no mistakes in math.....
Tony387
Contributor
That's not adding up. Even at 66 ft, with a safety stop factored in with a sac of 1.0, you're left with 8.5 cu ft to ascend, that's one minute delay at 66ft with 5.5 cuft left for travel ascent. That's very conservative and more than enough, IMO.
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Sent from my SCH-I545 using Tapatalk
keep in mind that a 13cf pony bottle amounts to about 500psi in an aluminum 80.
If you have a problem that requires you to use this pony bottle, it will probably get you to the surface if everything goes well. If you have a secondary problem, are a bit slow on the ascent, or are breathing heavily due to stress, then you might not make it.
If you have a problem that requires you to use this pony bottle, it will probably get you to the surface if everything goes well. If you have a secondary problem, are a bit slow on the ascent, or are breathing heavily due to stress, then you might not make it.
Tony387
Contributor
Agreed...personally, I prefer a 19 when using a pony. That's for any depth that a cesa is undesirable, usually in the 70 to 80 range.
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industrious95
Contributor
In response to the OPs original question, I mount my Pony on my main tank. I have the second stage around my neck with a latex hose leash, and the pressure gauge on my belt on a D-ring. I liked the compactness of those mini gauges that fit directly on the first stage, but since the Pony's on my back, I want to know how much air is in it, so I went with a regular gauge on a hose.
undrwater
Contributor
The Wright Brothers would have created their own forum.
It's interesting to see folks talking about CESA, then saying that a particular pony volume would no allow you to "make it". Is it really the case that if the pony runs out, you no longer have the option for a CESA? If I were at 80', and my pony quit at 30', hasn't it done the job to bring me to a safer CESA depth?
Yep...this is a fun topic indeed! :-D
To be on topic. Mounting the pony in front of you (closer to your side actually), is probably the most popular method. You can purchase pony (or "stage") rigging on some online sellers, and maybe your LDS.
OxyCheq Stage Bottle Rigging Closeout discounts on sale OxyCheq
There's an example. Do a search for "rigging a stage bottle" or "rigging a pony bottle" for some cheaper (though that link shows a pretty good value) options. Good luck, and keep your flame-proof suit on.
EDIT
After more carefully reading the OP:
OP, please take some time to consider your decision to solo dive so soon. Read up, research, and even better, get some dives in (with competent buddies) and pursue training.
Solo dives add a increased level of risk from diving with a competent buddy (whole other bucket of worms), so you need to mitigate those risks.
It's interesting to see folks talking about CESA, then saying that a particular pony volume would no allow you to "make it". Is it really the case that if the pony runs out, you no longer have the option for a CESA? If I were at 80', and my pony quit at 30', hasn't it done the job to bring me to a safer CESA depth?
Yep...this is a fun topic indeed! :-D
To be on topic. Mounting the pony in front of you (closer to your side actually), is probably the most popular method. You can purchase pony (or "stage") rigging on some online sellers, and maybe your LDS.
OxyCheq Stage Bottle Rigging Closeout discounts on sale OxyCheq
There's an example. Do a search for "rigging a stage bottle" or "rigging a pony bottle" for some cheaper (though that link shows a pretty good value) options. Good luck, and keep your flame-proof suit on.
EDIT
After more carefully reading the OP:
OP, please take some time to consider your decision to solo dive so soon. Read up, research, and even better, get some dives in (with competent buddies) and pursue training.
Solo dives add a increased level of risk from diving with a competent buddy (whole other bucket of worms), so you need to mitigate those risks.
Pixelator
Registered
Maybe these doubles.. LOL
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