haha, that's true! And price (for me at least) is a moderate issue. Also the 4" pvc i would buy turns out to be only rated at 133 psi, which is enough, id only be pressurizing up to 100 or so, but better safe than sorry. What about tennis balls? i was thinking of having a multiple barrels that i cou...

I've been considering building a piston valve launcher for some time now. I want to go big, I'm tired of making little launchers. I've made a few and now I want something bigger. I was thinking of making a 4" piston valve to shoot golfballs. would this be too large? should I just use a 3" valve?