This is the "Industrial Grade Human Powered Paper Rocket Launcher" in use at the LEAF festival in Black Mountain, North Carolina.
This parent brought her son to our "Rocket Make & Launch" session and realized she wanted to make and launch paper rockets herself. The paper rocket she launched made it all the way into the tennis courts!
Rockets are made from a half sheet of 8.5x11 "card stock" paper and can be launched many times. Rockets that are built well will fly 50 yards!
Download build-it-yourself plans at www.TomHeck.com