You put some bottles with a tennis ball in it and a garbage bag and shoot it. Get ready to learn how.

Step 1: Materials

The materials for constructing a bottle rocket include: 
- 4 2L Soda Bottles
- Cardboard
- Duct Tape
- Tennis Ball
- Box Cutter
- PVC Pipe
- Garbage Bag
- String 
what are those light blue strips ? just wondering
<br /> We have a sudden rash of water-rockets.&nbsp; I'm guessing it's a school project?<br /> <br /> Have you all seen the relevant groups:<br /> <br /> http://www.instructables.com/group/H2Orocketables/<br /> <br /> http://www.instructables.com/group/rockets/<br /> <br /> <br />
Where did the tennis balls go? From the difference between your write up and the labels on your diagrams I suspect you didn't originate this. Seems to be lacking some details for those who may want to follow your steps.

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