Step #1: Cut the foam and cinch with a zip tie.Next
- Cut a 9" section of foam pipe insulation. Wrap the zip tie 1/2" from one end and cinch it tight so no air will escape. Trim the excess foam above the cinched-off end.
Step #2: Apply duct tape to foam rocket body.Next
- Criss-cross 2 pieces of duct tape over the cinched end. Now cover the entire foam section with duct tape spanning the length. Three overlapping pieces of tape should do the trick.
Step #3: Cut and attach foam fins.Next
- Cut a 4"×1½" rectangle from the foam sheet, then cut it diagonally to make 2 fins. Repeat. Using generous amounts of hot glue, attach 3 of the fins, spaced evenly, onto the foam rocket body tube. If the glue doesn’t stick well to the rough duct tape, wrap 2 strips of clear packing tape over the duct tape around the bottom of the rocket to create a smooth surface for gluing the fins.
Step #4: Use it!
- Pressurize the compressed air launcher for 45psi–65psi, and launch. (For a lower pressure/altitude launch, use a stomp launcher.) When the duct tape finally fails with a spectacular blowout, just apply more duct tape over the blown section and keep flying!