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fire extinguisher cannon

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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fire extinguisher cannon

Unread postAuthor: absinthe » Wed Aug 12, 2009 7:40 am

i just finished my first pnumatic cannon...

i was lucky and found an old fire extinguisher that had a 1" fitting (not the slightly smaller thread they use now)..
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yes its old (made in 1967) and has a little rust but its only on the base, and it will be cleaned up and repainted very soon...
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it says it was tested to 450 psi and i tested it to 170 psi (as high as my compresser will go) and all seems well....

i only have a 1 mtr long barrel but at 80 psi i am able todo this through 12mm marine ply (the pipe is Al too so not much mass) :
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Unread postAuthor: jackssmirkingrevenge » Wed Aug 12, 2009 7:47 am

Good stuff, one small point though - the chamber is terribly oversized in comparison to the barrel, you can afford to have one much, much longer and squeeze every ounce of power out of it :)
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Unread postAuthor: absinthe » Wed Aug 12, 2009 7:49 am

jackssmirkingrevenge wrote:Good stuff, one small point though - the chamber is terribly oversized in comparison to the barrel, you can afford to have one much, much longer and squeeze every ounce of power out of it :)


yeah i know another barrel is on the way its just all i had at the moment... i will be making about 4-5 barrels for her (maybe more).. different lengths and diameters
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Unread postAuthor: The Game » Wed Aug 12, 2009 7:56 am

hmmm...a fire extinguisher...that's a good idea. i never thought about that before.
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Unread postAuthor: FORE!!!! » Sat Aug 15, 2009 6:45 am

NICE CANNON,but lol at the 42yo fire extinguisher ridden with rust spots,,

dont go bumping that thing under pressure :shock:
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Unread postAuthor: absinthe » Sat Aug 15, 2009 10:12 am

FORE!!!! wrote:NICE CANNON,but lol at the 42yo fire extinguisher ridden with rust spots,,

dont go bumping that thing under pressure :shock:


well the tank has no rust only the base... and its gonna be stripped and repainted very soon
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Unread postAuthor: absinthe » Sun Aug 23, 2009 10:47 am

ok another double post.. and i did something stupid.. i just dry fire it at about 280 psi (not sure if a sprinkler valve with this pressure is a good idea :P ) OMG it moved about half a foot under me thats scary... the tank only showed about half in the green (has built in pressure guage) i dont think i'll do that again
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Unread postAuthor: qwerty » Sun Aug 23, 2009 10:53 am

Are you in the uk? if so were did you get your sprinkler valve?
I wouldnt trust a sprinkler under that pressure so yes, dont do it again :D

Ive just noticed something funny.
look on the third pic down and on the right hand side of the fire exstingisher.

:lol: :D :P
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Unread postAuthor: absinthe » Sun Aug 23, 2009 11:29 am

nope I'm in aus and i wont try that again it was way to scary lol


"strike knob hard"?

its an old fire extinguisher with a thin copper disk and a pin for the valve you hit the knob and she starts to flow.. it has a trigger in the hose to slow it down but once you hit the know shes all GO!!!
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Unread postAuthor: Carlman » Sun Aug 23, 2009 12:31 pm

HOLY CRAP!! You put 280 through a sprinkler mate??!! They are normally good for 120 MAX.

That outa the way, where abouts are ya in this fair land.
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Unread postAuthor: Mr.Sandman » Sun Aug 23, 2009 12:38 pm

Hmm looks pretty uncomfortable of awkward to hold. But for a first i guess its ok i dont really like the chamber size as jack stated.
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Yeah, it's that important.
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