The rocket you see above, Zeus III, is a simple-as-possible design built in about 20 minutes with a few things we had lying around the house. It’s an empty soda bottle, some plastic fins ...

It's a pretty simple design---you can build it yourself or buy a kit. Here is a fancy homemade version of a water bottle rocket launcher (in slow motion). OK, here is one more water bottle rocket.

Mr. Schellenberg designs and builds "state-of-the-art-technology" pop-bottle rockets. They're made by attaching plastic or cardboard fins to an empty bottle, punching a hole in the bottle top to ...