This is an instructable on how to make a water rocket using only recyclable materials. All materials can be found in your house or classroom. This also involves a parachute, which is attached to a tennis ball, that will be deployed and in the air for at least 30 seconds. It's simple and quick, all you need is the right materials.

2 2L Bottles
1 Thin Garbage Bag
1 Manila Folder
2 Sheets of Arts & Crafts Foam
1 Water Balloon
3 Rubber Bands
1 Tennis Ball
Fishing Line
Exacto Knife
Duct Tape
Masking Tape

Step 1: Cut the First Bottle

In this step you will have to use an Exacto knife to cut out the center of the first bottle. Look at picture to see where to cut. Make sure you keep the top and bottom leftover from cutting out the center.
<p>how is this launched?</p><p>do you need a cork/bung for the lower bottle cap in which to place a pump?</p>
<p>duz nut wok</p>
I'm thinking that a bigger problem that the big orange thing killing stability and causing drag is the fact that the author neglects to mention anything about how to hook up an air pump. You can pump as much as you want, but if the pump isn't attached to the rocket somehow, it's not going to get much thrust.
I don't think that great big orange thing is going to help with stability or reduction of drag.
Same here <br>

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