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This is the air cannnon i have made recently. This is my second air cannon. The first one turned out to be a fail. It is 1 1/2 inch for the chambers and 1/2 inch for the barrel. Made out of all stuff from the hardware store. I have a double chamber so it can be fired mutilple times on one fill up. It can shoot anything that fits in a 1/2 inch barrel unless I get a reducer to make it a bigger barrel. I also recently added another valve right by the bike tire valve because it kept leaking. It is really fun to shoot.
I shot at AA battery through a old pop can from about 10 feet away and it went through both sides and through about 1 inch of styrofoam.
I like to shoot:
homemade nail darts
nerf darts
a piece of napkin with a lot of airsoft bbs in it
AA batteries
I am entering this into the I Made it Photo Contest so please vote
Thanks,
Zippy
you may want to put some pvc at the front to stop the chamber from bending