[chapman1]

Instead of this igniting yet another debate on the physics of air vs. physics of water, making PVC less desirable than metal in T-shirt cannons, let me just refer everyone to the prior threads that do so.

Then, let me commend your team on the robot! What a great PR tool. We're hoping to do the same one of these years. A few more details would be helpful: pressures, diameters, how you prepare the shirts, etc.