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1000 FPS Pneumatic Cannon...

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1000 FPS Pneumatic Cannon...

Unread postAuthor: D-Roc » Tue Apr 25, 2006 8:57 pm

Is it possible to make a pneumatic that can hit 1000 FPS? No, I'm not going to fire it at people, animals, or private property. I'll just use it to lob golf ball-sized things in the sky or across the park. And of course add every posssible safety feature to it...
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Unread postAuthor: Urban Ninja » Tue Apr 25, 2006 9:40 pm

it is possible, just use th ggdt and try a few numbers
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Unread postAuthor: Andrew52 » Tue Apr 25, 2006 9:46 pm

actually i think u have to use a different gas like freon or somthing
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Unread postAuthor: Benny » Wed Apr 26, 2006 12:35 am

you have to use helium or hydrogen. :D
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Unread postAuthor: beebs111 » Wed Apr 26, 2006 3:49 pm

i bet that if you got some big ass steel pipe and charged it to like 2500 psi , and had a steel golfball barrell you could probably hit 1000 fps, the valves im not so sure about. maybe double 4" butterfly valves........
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Unread postAuthor: FiveseveN » Wed Apr 26, 2006 4:11 pm

1000 fps is about Mach 0.9. No matter how much pressure you have, I doubt you can accelerate a projectile to that speed using air at a constant (it's actually dropping due to decompression) temperature. As for the valve, you'd probably need to make a mildly explosive burst disk. I don't think the GGDT can compute systems at transonic speed. Correct me if I'm wrong.
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Unread postAuthor: spudshot » Wed Apr 26, 2006 4:31 pm

you can make one that will hit that speed, freefall's HVPL-01 goes above it, just skimming the sound barrier, i made a copy of it, though mine doesnt perform as well (shorter barrel)
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Unread postAuthor: D-Roc » Wed Apr 26, 2006 5:02 pm

Can you post a link to the HVPL-01? I searched and found no results..
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Unread postAuthor: boilingleadbath » Wed Apr 26, 2006 9:41 pm

Mach .9 is no biggy - although you won't be able to acheive it with reasonably massed projectiles, any kid with solvent and a sprinkler valve could put together a gun which would get a paintball to 1000 fps - albeit with a long barrel.
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Unread postAuthor: nicholai » Wed Apr 26, 2006 10:43 pm

Benny wrote:you have to use helium or hydrogen. :D


or nitrogen or carbon dioxide :)
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