• Welcome to ScubaBoard


  1. Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.

    Benefits of registering include

    • Ability to post and comment on topics and discussions.
    • A Free photo gallery to share your dive photos with the world.
    • You can make this box go away

    Joining is quick and easy. Login or Register now by clicking on the button

spare air? i use one and i get laughed at

Discussion in 'Tanks, Valves and Bands' started by yogavnture, May 21, 2019.

  1. Bob DBF

    Bob DBF Solo Diver

    # of Dives: I just don't log dives
    Location: NorCal
    6,536
    6,685
    113
    What is this hypothetical appropriate sized pony bottle that will be enough for any entanglement or hazard one might envision? I'm figuring it is all dependant on what scenario it is limited to.

    Years ago I picked up a spare air and found it did not hold up to the conditions I dove in so I went back to diving without. This is not to say I never took redundant air, but I needed to have a real good reason to drag along an extra 72 or 80. As I'm getting older, I picked up an Al 20 pony for my deeper, and/or more interesting dives.

    All this considered, I have never met the conditions to use any redundant air, save testing the unit.



    Bob
     
    dead dog likes this.
  2. James79

    James79 Regular of the Pub

    # of Dives: 25 - 49
    Location: Lower Alabama
    253
    189
    43
    I'm aware.... it was meant in jest
     
  3. akdeepdiver

    akdeepdiver Dive Shop

    # of Dives: 200 - 499
    Location: Iowa Park, TX
    1,114
    254
    83
    To each thier own. Would I use one, no. Would I laugh at another divers gear choice, again no. The only gear choice I laugh at are the divers that carry a dive knife the size of a large bowie knife, like they are going to have to fight off a Sea Hunt villian on every dive.
     
    D_Fresh and agilis like this.
  4. tech_diver

    tech_diver Dive Equipment Manufacturer

    389
    427
    63
    Ooooh! So that's why people are laughing at me!

    Hey, no reason to stop wearing a perfectly good knife from the 1970s even if it is a little bulky.

    Besides, we'll see who's laughing when the underwater villains really do show up, not to mention fighting off giant squids.
     
    captain, Namreg 58 and Bob DBF like this.
  5. ScubaBunga

    ScubaBunga Nassau Grouper

    # of Dives: 500 - 999
    Location: wright city, mo
    125
    74
    28
    I wouldn't laugh at someone with a spare air. I used to have one (actually lost it on the "white glove" size in the bahamas). However, that 11 breath thing - have you actually tested it at depth? If you have a problem and switch to it, you better be on your way up. It is definitely better than not having any air and will give some help for a CESA. If you take any time to think while on it you will be OOO very quickly. Maybe 11 breaths at the surface while calm, but 4-5 at any depth and if you are excited and taking deep breaths (assuming you were needing air because primary failed several seconds ago..), you will be right back where you were with the initial failure. If you know what time you have with it, it will surely help in an emergency. If you don't and don't act quick enough it will be a useless device. I would say take a safe dive and test it at depth (simulating an OOO event - including increased stressed level) to give you a really good idea of your time to react. I've now invested in a pony, but it doesn't travel and is only used on deep dives - so having a spare air would still be of benefit (much easier to travel with - to just refill from rental tank).
     
  6. W W Meixner

    W W Meixner Rebreather Pilot

    # of Dives: 500 - 999
    Location: Ontario Canada
    758
    521
    93
    Y...

    Certainly nothing funny about running out of breathing gas...or making jokes about dying as a result of running out of breathing gas...

    When you discuss deco...and reduntant gear while conducting obligated deco...''Spare-Air''...is far less than you should be carrying...

    Unless your one long paragraph is intended to be a joke...there is a lot wrong with what you're doing...

    Who is filling your Spare Air cylinder...because if it hasn't been serviced in ten years...the cylinder is five years out of hydro...

    Not Laughing...
     
    Dark Wolf and Diving Dubai like this.
  7. W W Meixner

    W W Meixner Rebreather Pilot

    # of Dives: 500 - 999
    Location: Ontario Canada
    758
    521
    93
    Jay...

    Following correct ascent NDL protocols...Spare Air will not get you safely to the surface from 130'...a diver would be out of air likely before reaching 90'...do the math...

    If the OP's thread is a joke...it's not funny...if it's not a joke...it's ''seriously'' not funny...

    Better to dive like your ''Jacques Cousteau'' friend...than to dive like this...a fence is only a fence if it keeps out what is trying to get in...anything less is a false sense of security...foolhardy...and dangerous...

    W...
     
    Magnus Lundstedt likes this.
  8. Bob DBF

    Bob DBF Solo Diver

    # of Dives: I just don't log dives
    Location: NorCal
    6,536
    6,685
    113
    The SA has a special fitting and a yoke fill adaptor and you do it yourself, so the issue of maintainance is self-limiting. If I see someone starting to fill one I ask about the hydro date so I can choose the proper distance from the event that my buddies and I can stand.

    I agree that anyone that figures that a SA is a proper redundant backup for deco dives should retake their training, assuming they had training.


    You are correct, if you assume that it is used an extension of your back gas. If you use it as an additional few breaths during a CSEA, it makes the trip up less stressful.



    I'm no big fan of the SA, however it is a 3 cuft bottle, or less depending on the model. The problem I see with it, is that some have decided that the only reason a diver would choose it is because of ignorance. Pointing out the size, and whether it will meet the divers expectations is a good discussion, condemning it for not meeting your expectations and projecting that need on another is not.

    I chose a 20 for my deep dives, on the calculations of others this is not enough. So what's enough redundancy? 30, 40, 80, doubles, double 120s, double 120s with an 80. The answer is to calculate what you believe you need, and temper that with what you will carry. Because if you will leave it behind because it is too much trouble, then any becomes better than none. Just make an informed choice.


    Bob
     
  9. JimBlay

    JimBlay Divemaster

    # of Dives: 500 - 999
    Location: Boca Raton FL
    188
    180
    43
    I believe in redundancy especially diving solo but a spare air is completely inadequate. I see them on occasion but I do not laugh of the owners. I never laugh at anyone regarding how they decide to dive. Roll my eyes at times, but never laugh.

    If you feel you need some redundancy, why not get an adequate solution to the problem? I frequently sling an AL40 when diving solo or deep on a single tank.
     
  10. W W Meixner

    W W Meixner Rebreather Pilot

    # of Dives: 500 - 999
    Location: Ontario Canada
    758
    521
    93
     
    Bob DBF likes this.

Share This Page