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dry ice pressured cannon?

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dry ice pressured cannon?

Unread postAuthor: me78569 » Fri Oct 14, 2005 10:11 am

it was a thought awhile ago of mine to use dry ice to pressurize the chamber of a copper gun. dry ice here is cheap and always available to me. using the same amount of dry ice per amount of water you could get the same pressure each time right? of course i would do ALOT of testing to find the pressure produced from certian amounts of drying and water if i couldnt find some sort of chart on the internet. think this would produce a pretty uniform shooting gun? just a thought for when i have the time/ money to have some more fun

nick
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living in westcliffe co pop. 1000 leaves lots of time to tinker. 200 f\s phuenmatic dishpan spudgun ....only a start.
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Unread postAuthor: drac » Fri Oct 14, 2005 2:52 pm

I doubt it, the copper would get so cold that it might become brittle. In my opinion, it would be much cheaper to buy CO2 and a regulator, istead of wasting mony more and more on dry ice.
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Unread postAuthor: boilingleadbath » Fri Oct 14, 2005 4:07 pm

Pressure produced won't be terribly consintent. But for blasting things at close range, it will be fine.
CO2 can "generate" quite high pressures, so be sure to install a saftey pop-off.
As to copper getting brittle, it's being kept at about 0*C, which really isn't that cold. Also, to my knolage, copper isn't affected by temperature that much... but I'll edit my post once I ask a more knolageable person.
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Unread postAuthor: sergeantspud2 » Fri Oct 14, 2005 5:32 pm

how does dry ice work doesn't cold get smaller and heat expands?
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Unread postAuthor: boilingleadbath » Fri Oct 14, 2005 5:44 pm

Yeah, but <strike>boiling</strike> sublimating CO2 produces lots of gas.
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Unread postAuthor: sergeantspud2 » Fri Oct 14, 2005 6:18 pm

oh ok thanks now i know how dry ice bombs work check this out
its kind of funny but very painful :lol:
http://www.lookatentertainment.com/v/v-1038.htm
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Unread postAuthor: saladtossser » Fri Oct 14, 2005 8:51 pm

that proves the unpredictablilty of dry ice. i saw that b4, those idoits
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Unread postAuthor: boilingleadbath » Fri Oct 14, 2005 8:59 pm

No, it's perfectly predictable. If you get a way to put as much pressure as you want (up to 800 psi) in a thinwalled plastic container, it will explode.
Darn it, you guys just seem to be giving weaker and weaker arguments. It's acctually pretty lame.
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Unread postAuthor: me78569 » Sat Oct 15, 2005 11:21 am

thanks i wasnt sure if you kept the ratio of dry ice to water the same if it would be predictable enought to use for a gun. just one of those thoughts.
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Unread postAuthor: pyromanic13 » Tue Dec 13, 2005 7:56 pm

ya well I think it could be preety consistant , just grind up the dry ice and compactit into A premesured container for each shot plus premeasured water.

ive acually made a very desent dryice , chambers about 1 inch 6 inch long galvanised with a ball valve and I forget about the barrle length/size

but ya I guess my point is you can make a good powered cannon that takes up half as much space ( higher pressuers)


p.s I dont care if my spelling sucks
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