Instructables
Picture of Tennis Ball Bottle Rocket by jessedarrencorey (tm)
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

Picture of 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 

Step 2: Cut Wings

Picture of Cut Wings
Cut three identical wings out of cardboard and tape the to the bottle with water. (see step 6)

Step 3: Setting Up Capsule (top)

Picture of Setting Up Capsule (top)
Cut off 2 inches from top of bottle, then tape the rest of that bottle to the midsection of two other bottles. Make sure you round the end of the freshly cut bottle to ensure maximum torque.

Step 4: The Parachute

Picture of The Parachute
Construct a parachute. How you ask? Well its simple, cut a circle out of a garbage bag that has a diameter of 4.2 feet. Next cut 6 slits around the outside of the garbage bag circles. Next, tie 6 pieces of string into the 6 slits and attach the other end of the string to a tennis ball. Tape the string to the tennis ball and before you know it, you'll have a functioning parachute. 

Step 5: Setting It up so the parachute releases

Picture of Setting It up so the parachute releases
blow up a balloon with 4 solid blows of air. Tape that balloon to the end of the capsule. The balloon should also taped to a harness which can be constructed from the base of a 2 liter bottle, about and inch and a half from the bottom.

Step 6: Finishing up

Picture of Finishing up
While finishing your rocket, a few more things must be done to ensure total domination. Take a whole 2 liter soda bottle and fill it half way with water. Attach the wings you constructed in step 2 to this bottle. Turn this bottle upside down. Inside the capsule, place 4.167 inches of PVC pipe (which can be cut by string) to the base of the final water bottle which has the wings attached to it. Place the tennis ball on the end of the pipe with the parachute attached and cover it with your capsule. 
 
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spykids4 years ago
what are those light blue strips ? just wondering
Kiteman4 years ago

We have a sudden rash of water-rockets.  I'm guessing it's a school project?

Have you all seen the relevant groups:

http://www.instructables.com/group/H2Orocketables/

http://www.instructables.com/group/rockets/


rickharris4 years ago
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.