pic: Team Fusion's T-Shirt Shooting Robot

[bhweezer]

Originally Posted by NoodleKnight

What are you using as the valve? SCH40 PVC is good up to it's pressure rating, which should be printed on the tubes, and I think it's far past 250 psi. The PVC joints are always built stronger than the pvc piping, so as long as you cured/glued the joints correctly, all will be fine.
I always like to put my psi limit depending on the valve, I usually use a normal sprinkler valve, which is good to 120 psi; so I set mine to 100-110 psi and it can shoot stuff far enough for my purposes. If you're using a ball valve, you could go higher, but at that point I'd be scared, lol. I suppose you could make some type of scatter shield for it.
If you're having problems shooting the t-shirt high up into the stands, try cramming the shirt down the barrel, hard. You don't want any air bleeding past the t-shirt.

We don't have any problems with getting distance with the shirts. When I shot them I had two different ways of folding the shirt. One would go maybe 10 yards, the other could easily go 40 yards. A couple of times we shot shirts over crowd and into the parking lot. I'll make sure to get some pictures of the cannon in action after the first football game in a couple of weeks.

The valve is a RainBird in-line irrigation valve. It's only $16 at Lowe's.