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Question PCP air volume

Discussion in 'Anything Airgun Related' started by Sir Oscar, May 29, 2014.

  1. Sir Oscar

    Sir Oscar Donator

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    Location:
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    First off I apologise if this has been asked before, but I have searched and can't find it. :)
    My question is. How much air does a PCP use per shot?
    I realise this is a question with many variables (fill pressure, barrel length, caliber etc) so I'm just after a very rough answer, to give me a starting point.
    A better way of wording it maybe is, how much air does your rifle (insert caliber) use per shot, what is your fill pressure and what power.
    I'm only interested in legal limit rifles, so no pistol and FAC please.
    I should also add I'm mainly looking at .177 but other cals are welcome to answer.
    Thanks.
     
  2. tombillings916

    tombillings916 Donator

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    My Regal .22 has a 132cc cylinder which I fill to 190bar - I get about 90 shots before i refill at around 105 bar, so 85 bar used for 90 shots+- therefore just under a bar a shot (1 bar =14.7psi).Hope this helps :)
     
  3. mark112

    mark112 Engaging Member

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    Hi,

    Depends on many, many things but my .22 S410 carbine uses roughly 1 bar/shot and my .177 S400 uses 0.73 bar/shot.

    Mark
     
  4. Tinbum

    Tinbum Delusions of adequacy

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    My .22 Cyclone got 220 shots from a 185cc reservoir before dropping off the reg, but my Typhoon only got 120 from the same amount. An air arms s4** full length can get around 80 in the sweet spot which isn't quite right for comparison, but they're not regd like a proper pcp.:cool:
     
  5. mattyts

    mattyts Donator

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    Location:
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    My MPR does 100 shots from 200 bar down to 100 so 1 bar per shot.

    My S400 Karbine,approx 70 from 200 down to 100.

    Ultra,regulated does 65 from 250 down to 90

    Although the relationship might not be linear and have a straightforward correlation,shots probably use a lot more at lower pressures and tails off pretty quickly.
     
    Last edited: May 29, 2014
  6. jps norton

    jps norton One Hit Wonder

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    Location:
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    My Daystate Mk4IS uses approx. 1 bar per shot
    Seems about the average with the above posts included
     
  7. Sir Oscar

    Sir Oscar Donator

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    Hmm. I think I need help with my maths here. I'm actualy after the cc of air used per shot, for a given pressure. I may be able to work this out from some of the answers above, but the math is beyond me. Does someone know the formula for working this out?
    Thanks for the answers above, I'm sure they'll help once I have my math head screwed on. :)
     
  8. mattyts

    mattyts Donator

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    You used 550 psi of air, which is 38 Bar.... The MRod reservoir is 215 cc = 13.1 CI.... Total air used was 38 x 13.1 = 498 CI....

    I took the above from another forum,if it's right I've wrote the following...

    Formula is:
    Pressure used (Bar) x Cylinder size (CL) = Air used (CL)
     
    Last edited: May 29, 2014
  9. Sir Oscar

    Sir Oscar Donator

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    Location:
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    So going by that your using 4.98cl of air per shot@1 bar?
    If that's wrong I'm over thinking and my heads screwed! :D
     
  10. mark112

    mark112 Engaging Member

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    So 156cc (1bar of 156cc) and 158cc (.73bar of 216cc) if this really helps. It may help if you try to explain what you are hoping/trying to achieve!
     
  11. Sir Oscar

    Sir Oscar Donator

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    Location:
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    I will be building a test rig and I want an air reservoir that only holds enough air for 4 or 5 shots. Reason being that should I have a failure on the rig I'll only have a small amount of air discharging.
     

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