Use your hands to adjust the cardboard to get the perfect cone shape.
If the cone is too large for the bottle, then trim the opening of the cone until it is just the right size.
Folding the long edge of each right triangle by 1⁄2 inch (1. 3 cm). Cutting 2 slits, 2 inches (5. 1 cm) apart along the creased edge to make 3 tabs. Folding the middle tab backward. Taping each fins’ tabs to the bottle using duct tape.
Make sure the circumference of the pipe is large enough so that the top of the soda bottle can fit inside. You can purchase PVC pipe from your local hardware store.
Have another person hold the other end of the pipe to keep it steady while you cut, or use clamps to hold the pipe in place.
If the opening of the bottle is touching the ground, then you will need to cut a larger piece of PVC pipe.
The paper towel acts as a time release. This way, you will have enough time to step away from the rocket before it explodes. If the paper towel breaks, exposing the baking soda, then use a new paper towel.
Pick a spot outside where you can make a mess.
The cone part of the rocket should be facing toward the sky.
If the rocket does not explode, then you may have secured the cork too tightly.
