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12g CO2 cartridge energy in J? please help

  1. Apr 17, 2013 #1
    I would love to know much total energy, in Joules is in a typical paintball/airsoft 12g CO2 cartridge?

    Thanks everyone.
     
  2. jcsd
  3. Apr 17, 2013 #2

    berkeman

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    Staff: Mentor

    What is the volume and the pressure?
     
  4. Apr 17, 2013 #3
    12 grams of liquid CO2. and CO2 when under liquid under room temp makes about 850psi as far as I know.
     
  5. Apr 17, 2013 #4

    berkeman

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    Paintball guns use liquid CO2? I had no idea. I though it was just compressed CO2 gas like my old pellet guns...
     
  6. Apr 17, 2013 #5

    berkeman

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    A quick Google search shows more info about the cartridges -- looks to be a mix of liquid and gas before the cartridge is first pierced:

    http://www.pyramydair.com/article/What_About_CO2_December_2003/6

    Learn something new here at the PF every dang day! :smile:
     
  7. Apr 18, 2013 #6
    Ok so any idea about the energy 1 cartridge holds? even a rough estimate would be great.
     
  8. Apr 18, 2013 #7
    As a very rough approximate I have a semi-auto .177 CO2 rifle (Crossman brand, model name unknown) with 12 round speed-loaders. It gets 4 full speed load clips on each 12gm CO2 cartridge before I start to notice a degradation in trajectory. The muzzle energy is 8 ft/lb @ 1.36 joules per ft/lb. This would give 8 x 1.36 x 48 = 522 joules until the pressure of the gas drops to the point where I change the cartridge.

    However I suspect the true energy is higher as this rifle seems to waste a lot of gas. There is significant noticeable gas blow back and CO2 smell from the weapon, which does not happen with some other models.

    BTW I we are not measuring the actual energy of the gas (that would require e=mc^2) but the usable energy from gas pressure.
     
  9. May 9, 2013 #8
    Yes I was asking about usable energy from pressure
     
  10. May 9, 2013 #9

    Danger

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    Gold Member

    This isn't useful to the question, but perhaps of interest. I had a Crossman CO2 pellet pistol, and so always had a few cylinders kicking about. One time at my friend's place, I wedged one into the latticework of a corncrib with the nipple pointed toward a protected position. From that position (behind a cast-iron cultivator), I proceeded to lay the crosshairs of a 4X scope on a .22 rifle upon said nipple and let loose. All that I saw at first was a massive cloud of fog and dry ice crystals. After a second or so of looking around, my buddy pointed upward, and there was this little silver flash departing the area at about a 60° angle, at least 100 metres in altitude and still climbing. We never figured out where it landed.
    Needless to say, I don't recommend this as a home project.
     
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