well.... those sound very good... in theory, but i'm not independantly wealthy. as its an outdoor contest, in the middle of a music festival, i'm most limited by how much i can lug in. i have a smaller air comp that is capable of getting to 120 psi. was researching piston valve mechanism cannons. ca...

i have been invited to an event that has a contest to see who can launch a 2 liter bottle the farthest. i am curious if anyone has any thought s on a design, and method of acheiving this with compressed air, or even cumbustable propulsion. i work in a metal shop and have access to tools, machines an...