PVC paper rocket launcher designs are a dime-a-dozen. So why another one? Because I've tried many other designs found on Google and YouTube, and none of them are 1. fairly easy to build 2. perform spectacularly and 3. easy for kids to operate. I have finally come up with a design that fulfills all the criteria for an amazing rocket launcher after conducting the paper rocket project with my engineering class countless times.
This Instructable also outlines how to make a high-performing rocket, which is just as important as having a great launcher. The students in my engineering class have made rockets that can fly over 100 yards from this launcher - it's rather mind-blowing to witness.
The video doesn't quite capture the sheer distance that these rockets can reach, but I think you'll get the jist of it.