This harrowing t-shirt cannon was built by Team 254 Robotics of Bellarmine College Prepatory of San Jose, California with the help of NASA Ames Robotics. It weighs 160 pounds, can shoot over 200 t-shirts per tank, has a range of upwards of 150 yards, and packs a rate of fire of 3 shirts a second. Check out the build notes if you want to learn more.