I used to run a free summertime activity program for kids as part of a past job.
I've got a lot of fun little projects up my sleeves, and I'm always on the lookout for more. One of the more popular summertime activities in my repertoire was homemade stomp rockets. Stomp rockets are great because they are both creative and physical.
There are many versions of paper stomp rockets and launchers out there. They all work essentially the same way: air is forced through a PVC contraption which launches a lightweight paper rocket up into the air. This particular launcher design is a combination of a handful of ideas I've seen, along with a few of my own additions.
I have a basic rocket design that I drew up that uses a single sheet of paper, which I've included in step 6 as a PDF.
Read on, and then go have some fun. (And hey, if you like this you should try out my Paper Stomp Jets!)