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Redundant Air Supply

Discussion in 'Tanks, Valves and Bands' started by asmfish, Apr 13, 2019.

  1. asmfish

    asmfish Angel Fish

    # of Dives: 25 - 49
    Location: New York
    Hey guys I’m looking to invest in a redundant air supply (pony bottle) I’m single tank diver who just started diving locally where a lot of the dive boats require one. Does anyone have any recommendations on what size I should be looking to purchase. I don’t do wreck penetration dives or any cave diving. And greatest depth would be around 120 feet.

  2. caruso

    caruso Loggerhead Turtle

    # of Dives: 200 - 499
    Location: Long Island, NY
    Now here's a topic that's never been discussed on this forum before.

    /sarcasm off

    Ok since you asked, it's generally agreed that a 19cf pony bottle will suffice for most recreational divers who dive to as much as 130'. That size pony bottle can be carried in luggage and isn't too inconvenient to lug around with the rest of your dive gear while providing sufficient gas for most divers to make it to the surface if they have an OOA situation at maximum recreational depths.

    Next size down is about 13cf and it's not really that much smaller for all practical purposes and now you're getting into a grey area where it might not provide enough gas.

    Then there's the "Spare Air" self contained "mini bottle" system. Some divers (such as me) will tell you any extra air is better than no air, and yet others will tell you that if you use a Spare Air you're going to die it's only a matter of when.
  3. BurhanMuntasser

    BurhanMuntasser Dive Charter

    # of Dives: I'm a Fish!
    Location: Nomad
    When I dove in the NY/NJ area, wrecks in recreational depths mostly, I used 40cuft tank for a pony bottle. I take the worst case scenario depth wise and potential reason for running out of air, stuck at the bottom because of fishing lines or similar add the time for the safety stop and possibly a buddy in need of air and 40cuft is minimum for me.
  4. BluEclipse17

    BluEclipse17 Angel Fish

    # of Dives: 200 - 499
    Location: NOLA
    Personally i'd carry an aluminum 40. I'd rather have the extra gas to return to the mooring/anchor line and do a slow accent with safety stop. It's only a little longer than the 30cf cylinder and still small enough to make it easy to handle. It would not be as convienient to fly with but if I'm flying i'd rent anyway. I mostly dive doubles so I don't usually have a pony bottle but if often carry the 40 for decompression dives.
  5. caruso

    caruso Loggerhead Turtle

    # of Dives: 200 - 499
    Location: Long Island, NY
    I see you're in NY, so am I. Curious what dive boats you're looking to go out on? Most are gone. I was just looking to see what charter schedules are posted and they're slim pickings.

    2 years ago, I picked up an 18 footer and got out on the LI sound and did about a dozen dives including one of the artificial reefs with wrecks at about 60'. As well as some jetties and rocky reefs that are not accessible from shore because the rich folks own all the property. Always looking for company.
  6. W W Meixner

    W W Meixner Rebreather Pilot

    # of Dives: 500 - 999
    Location: Ontario Canada
    DSCF1173.JPG DGX....jpg Attached photos shows some potential options for you...

    I have an AL 30/27/19...the harnesses are DIY...the butterfly snap hooks/sheathed S/S straps are DGX...

    The harness assembly on the 27 is interchangable between the 27 and the 30...the small harness assembly on the step is for the 19...

    If your not into DIY...DGX has pre-fabbed harness assemblies with all the hardware...

    Their house brand deco/stage/bailout fully assembled reg sets are an excellent buy...

    Hope this helps you...


    asmfish likes this.
  7. doctormike

    doctormike ScubaBoard Supporter Staff Member ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: New York City
    Awesome! Another NY area local diver... come dive with us, if you are near NYC.

    I think that the 40 is such a common standard in our area (where people use them for deco and bailout), that unless you are really planning on flying a lot with your pony, you will find it easier to buy a 40 used (and sell later if necessary). Plus, when you are slinging the bottle, the difference between a 19 and a 40 isn't very noticeable, and I think that the 40 actually hangs better.

    Plus - more gas! Always a good thing (see the last 6,000 threads on this topic).
    asmfish and BurhanMuntasser like this.
  8. noj3333

    noj3333 Solo Diver

    # of Dives: 100 - 199
    Location: Albany, New York
    @caruso and @doctormike...

    If there's ever interest in setting up a charter I'd be interested and could drive down...
    caruso likes this.
  9. doctormike

    doctormike ScubaBoard Supporter Staff Member ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: New York City
    We have a bunch of charters, although they are mostly sold out at this point... but I'm at the NJ shore lots during the season

    Dive Schedule
  10. Diver below 83

    Diver below 83 Barracuda

    # of Dives: 0 - 24
    Location: SoFlo
    Wow they are a lot closer in size then I expected. How much larger is a 40 next to a 30?

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