Thanks a lot for those answers, very good info.

another question, what is the highest psi / optimum psi you would recommend for firing the cannon?

I'm making my first spud gun. I'm making a simple design with a sprinkler valve. How can i make sure that the PVC tank does not explode? Has anyone experienced a tank blow up on them? if so, what pressure did it explode at? Should i be concerned about this hazard? Also, what is the best way to insta...