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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?

7 Replies

user
rocketman20 (author)2011-11-04

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 (author)2011-10-28

It would probably have a mini air compressor

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onrust (author)2011-09-06

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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KarateLover21 (author)onrust2011-09-07

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

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onrust (author)KarateLover212011-09-07

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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KarateLover21 (author)onrust2011-09-08

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

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