Here is the Stomp Rocket Launcher
Designed by Retired_for_now
Basic plans for a stomp rocket launcher and an ARES I rocket to launch. The launcher is built from a few pieces ($6) of 3/4 inch PVC plumbing and a 2 liter soda bottle. It will launch projectiles up to 100' straight up. It can be used to launch just about anything that will accept a paper launch tube "motor" and can use various sizes of PVC tubing for the launch tube to accommodate various projectiles.