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Old 09-27-2007, 01:54 PM   #11 (permalink)
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I have the same problem when I dont have paint in my marker but it does it with co2 and air. It is always a nice surprize to the guy running up on me becuse he thinks I ran out of air and he gets a few to the chest
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Old 09-27-2007, 01:59 PM   #12 (permalink)
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Shooting paint creates some back pressure.

Reason why CO2 and HPA work differently in some of these guns is that Co2 expands much more to do it's work (3000x from liquid) and has much more energy trapped in a given volume than compressed nitrogen ( which makes up most of our air)
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Old 09-27-2007, 11:43 PM   #13 (permalink)
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Except that it's a gas at around 800 to 900 PSI when in the valve area since most of the 1:3000 liquid to gas was done back in the bottle or line. So the expansion from there to the barrel and bolt face is pretty much the same as with HPA.

My own thinking, which I can't prove, is that CO2 is a more dense gas so it hits the works with more of a punch. But where my logic (CO2 IS a heavier gas than just "air") falls down is how does this work when you end up having to reduce the hammer spring tension to make up for it and keep the ball velocity the same?
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