How to build a bottle rocket?

A bottle rocket can be fun and easy to make. Here’s how to build and launch a simple bottle rocket using things you find around the house. 


Things you will need:


2 bottles (two 2-liters bottles work great for a regular sized rocket, but if you want to build a mini-rocket, you can use a regular water bottle)  

 3 Fin material (thick card stock or thin cardboard would work well)  
duct tape (to hold together your rocket)
 
a pair of scissors

a weight

a cap with hole

a marker pen


 

 Rocket Launcher:

water and bicycle pump with needle valve

Steps:

1. Make a mark every 4.5IN on a bottle.

2. Cut the top off one of your bottles.

3. Tape the top onto the other bottle.

4. Align the fins on the marks.

5. Put a weight on a cap.

6. Put the cap on your bottle.

7. Add 1/4 liters of water.

8. Pump about 20 full pumps.

 Video from You Tube:
 http://www.youtube.com/watch?v=1t663D_gErg