I just checked and the grease is a fibrous sodium grease, anyone know if that'd cause problems?

It went through a rigorous test this weekend when I took it to a Nat'l Guard training weekend and used it to fire foam footballs at Humvees as a makeshift RPG. It worked fine, I just found a slight ...

I've pretty much given up on the permanent fix to my greasing problem. I have found though that heavy duty wheel bearing grease stays put longer than the marine grease, so that's what I now use. I have also now pressure tested my cannon up to 95 psi, and it held. I only had a small leak at the end ...

I was able to fix mine. I still will try and get pics, but here's what I did: Picture my piston from before, it was loose in the chamber, and quite hollow. I filled it in with hot glue, and put a washer on the back as well as the front. Then another little modification I made was to fill in the ...

I used to play with a combustion cannon that my father and I had made, now recently I have come across a need for a pneumatic cannon. I found a design I like ( Aqualab cannon ). I tried to rebuild it, only using a 2" barrel. After many interesting dilemmas I have changed it like this: I am using a ...