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Pneumatic cannon no pumping? Answered

I wanted to build a soda shooting fridge canon like this 
http://www.youtube.com/personalbeerrobot#p/u/3/TVyLuosZ1rY
but I don't understand how the cannon in question works. All pneumatic cannons I have dealt with have required pumping, but this one appears not to require pumping. How does it work?

Discussions

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rocketman20

6 years ago

You could make a pnuematic cannon that fires about four rockets (or whatever your shooting) but only filling it once.

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dog digger

6 years ago

It would probably have a mini air compressor

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onrust

7 years ago

I'm just guessing but a gas solenoid valve. I have seen them on several types of compressed air / gas cannons.

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KarateLover21onrust

Answer 7 years ago

but what gas propels the can if no one is pumping it?

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onrustKarateLover21

Answer 7 years ago

I seriously hate to be rude, BUT if you can't figure the different compressed gasses..... I'm not going to tell you how to hurt yourself. :(

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KarateLover21onrust

Answer 7 years ago

I am not going to hurt myself, I just want to know how he is propelling a can without pumping it with compressed air.