[dpeterson3]

Our team built one about three years ago for school. With the exception of 2 parts, the entire thing is PVC. The tank has been preasure tested up to 60 PSI with no problems. We only need about 20 psi usually, though. Our first attempt, the tank blew off. That was my fault. I didn't clean the PVC well and didn't use primer. Those are very necessary. Now it works great. If the towels (we use rally towels because they are a lot cheaper than shirts) are rubber-banded before they are loaded into the barrel, the go much farther. Our bleachers are built into a hill at about a 60 degree angle below the horziontal. From the bottom,. we can shoot over the booth with only 30 pounds of air. If you want, I can send you preformance statistics, videos, adn a few pictures on what not to do.

Good luck