Expert PCP GURUS

Forums PCP Airguns Expert PCP GURUS

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    mantech30
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    What makes one gun fill to 250 bar and another 300 bar?

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    farrahUSMC
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    I'm no guru  but I'l bite .. 300bar unless u have your own 4500psi compressor most scuba shop or paintball shop don't have that capacity to fill up to 300bar.  Price is higher for the 300bar bottle usually made of carbon fiber.  250bar bottle.. cheaper easier to fill at any shop or hand pump.

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    mantech30
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    This gun fills to 300 BAR!!!!!!!!

    My Impact only fills to 250? Why?

     

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    Glem.Chally
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    mantech30

    This gun fills to 300 BAR!!!!!!!!

    My Impact only fills to 250? Why?

     

    Because the regulator/action weren't designed for it.  Is that ataman regulated?

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    mantech30
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    Yes fully regulated.

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    sonny
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    one reason is the rating of the gauges they don't hold up to the 300bar pressure. liability is probably a factor also.

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    Glem.Chally
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    Well good on them,  seems to be a Russian thing to do.  Edgun does as well. Oh well cant have everything (yet)

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    Seth0764
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    Why does it say fully regulated? Are some guns partly regulated? Lol 

    Those Atamans are awesome they have one of the best regulators I've seen.

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    jarmstrong
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     Why are some car tires rated at a higher pressure than others? CAUSE that is their rated pressure according to the manufacture and their engineers. Different materials and wall thickness and so on affect the pressure ratings

    mea culpa

    • This reply was modified 4 days ago by jarmstrong.
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    Dairyboy
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    Like said different materials used and wall thicknesses. 

    Just because a gun can fill to 300 bar doesn't mean it's necessary. My .30 Flex is capable of 300 bar fills when regulated and 250 bar when unregulated. But I have it tuned right now for 21 shots at 85fpe unregulated with the string starting at 2700psi which is 186 bar. I'm debating on tuning it for more shots at a higher pressure but it's nice having such a low fill pressure.

    Regulated filling to 300bar doesn't gain you much really if you think about it. Sure more shots per fill technically but it's over a wider range of air so your not saving anymore air you just technically don't need to refill as fast. Now if you don't have your tank with you when shooting I can see the issue but if not there's no real benefit

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    mantech30
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    Dairyboy

    Like said different materials used and wall thicknesses. 

    Just because a gun can fill to 300 bar doesn't mean it's necessary. My .30 Flex is capable of 300 bar fills when regulated and 250 bar when unregulated. But I have it tuned right now for 21 shots at 85fpe unregulated with the string starting at 2700psi which is 186 bar. I'm debating on tuning it for more shots at a higher pressure but it's nice having such a low fill pressure.

    Regulated filling to 300bar doesn't gain you much really if you think about it. Sure more shots per fill technically but it's over a wider range of air so your not saving anymore air you just technically don't need to refill as fast. Now if you don't have your tank with you when shooting I can see the issue but if not there's no real benefit

     Thank you for answering my question.

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    Birdo
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    Pressure vessel design calculations require thicker wall thickness and that drives up weight and cost.  I used to design pressure vessels for power generation, and the hoop stress calculations are the same. This is why a long skinny tube gun is cheaper than a bottle gun

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    ackuric
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    The answer can be summed up in two words. Barlow's formula. There are other formulas to safely construct a pressure vessel but this is the primary one. 

    • This reply was modified 4 days ago by ackuric.
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    JungleShooter
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    Birdo

    Pressure vessel design calculations require thicker wall thickness and that drives up weight and cost.  I used to design pressure vessels for power generation, and the hoop stress calculations are the same. This is why a long skinny tube gun is cheaper than a bottle gun

    Oh, yes, explain that a bit more, plz!

    I get so aggravated at PCP makers who produce a very long gun, but then they make the air cylinder real short instead of all the way out to the muzzle…. And I want to shout out to them: "Don't shortchange us on air, you already made the gun large, might as well give us a large air supply!"

    And I get aggravated at PCP makers who make these thin little air tubes…. And I want to say: "This tube is barely thicker than my pinkie! My goodness, give us some air!!"

    And some guns would just look cooler with a bottle than a little airtube…. And I always thought, "Why don't the make more bottle guns?!" Well, you already have begun explaining that. Keep going!  😊

    Matthias

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