Instructables
Picture of Water Bottle Rocket Launcher
This is a fun way to get wet in the summer while playing with a rocket
 
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Step 1: Gather Materials

Picture of Gather Materials
You need the following materials 1. Two liter 2. Duct tape 3. 3/4 inch outside diameter PVC 4. Air compressor

Step 2: Get Seal

Picture of Get Seal
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Wrap duck tape around PVC till bottle seals around PVC

Step 3: Power

Picture of Power
Put air compressor blower on opposite end of PVC pipe and press to seal

Step 4: Launch

To launch pressurize compressor to 30 psi and pull trigger and it will fly off also this will work on small coke bottles optional add nose cone and fins also you can fill with water
What trigger???