The piston seems very sturdy and seems as if there is barely any air leak around it. When we drop the piston and gravity pulls it down you can feel the air coming out of the barrel. Im not sure if that means anything but it feels as if it is fairly tight. It cannot wobble around. we are suspecting ...

we have finished building our gun! Yay! however, there is a leak. Behind the piston.

So our questions are, is 10 psi to low to test to see if the piston is working? the leak seems to let out all the air even the chamber air.

Another is, is our piston to small and it is letting too much air back ...

Yeah we were originally going to not use one. however, just thinking about how if it isnt air tight the air would just flow straight out of the pilot valve. Is this right? We werent really sure.

Thank you for your suggestion about abs Techniciain1002 but we have found a place to buy the "sch40 Portable water" fittings. Yay! So we will start working on our piston tomorrow.

We were also wondering if a check valve was necessary, or will it work with out a check valve. I have tried using ...

Thank you guys for the quick reply! :)

Technician1002
- My school does not have a lathe unfortunately.
- Thank you very much for your suggestion on using a spring and the image of redesigning our valve. We will most likely use that design.
- We are also using a 1" sprinkler valve modded with a ...

Hey members of spudfiles! I am very new to these air cannons and was wondering if you could help me on my design of my piston. It is for a physics project, (high school) and is needed to go at least 300ft. My partner and I decided on trying to build a piston valve that could give us the edge on the ...