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Old 11-28-2001, 03:25 PM #1
july_favre
 
 
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How much PSI does it take to launch a ball at 300FPS?

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Old 11-28-2001, 06:42 PM #2
kensei66
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a nova can do it at about 100 psi... theoretically could be lower if you accelerated the ball gradually over a long enough time.
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Old 11-29-2001, 01:11 AM #3
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The words you are looking for is not PSI, but ENERGY.

psi-velocity ratios are not a correlation that can be figured out unless you have the volume of air determined.

Try this, figure out the volume and the pressure of a dump chamber type of gun, and then you can figure out the amount of energy used.

I already did this once, and have the file somewhere. It is about 4-5 pages long.

Surfice to say, a 'Mag has a .55 ci in dump chamber with a 400 psi operating chamber. It then uses about 210 ci*lbs of energy per shot (have this figured better on the other paper.) A Shocker has a 1.8ci dump chamber with a 180 psi working pressure. The shocker uses about 324 ci*lbs of energy. I have designed a pbgun and have some details on the PaintballNews>the 'Shiva' project. I have a dump chamber less than 1.4 ci, and a working pressure of 160 psi. I use about 225 ci*lbs of energy each shot.

To figure out how many shot per tank, take the volume, say 68ci, and the pressure, 3000psi, multiply.

68ci * 3000psi = 204000 ci*lbs

minus the lowest operating pressure of the gun, in my case 140psi, times the volume (68ci)

68ci * 140psi = 9520 ci*lbs

204000 - 9520 = 194480

divided by the amount of energy used each shot, and you get shots per tank.

194480 / 225 = 864

reverse this for a gun, say a spyder, which normally gets say, 800 shots on a 68/4500 tank, and runs down to 300 psi or so, and you can find the amount of energy used per shot.

Happy mathematics,

Josh
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Old 11-29-2001, 02:13 PM #4
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yes... that is what i was going to say :-)

basically, any nonzero psi force applied to one side of a ball can accelerate the ball to a very high speed if applied over a long enough time.
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Old 11-29-2001, 02:17 PM #5
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In a paintball type application. If you hade a 14" blowgun, what psi would it take to accelerate it to 300FPS if there were no flow restrictions
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