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Step 1: Cut Top Off One Bottle
Step 2: Place Top on Bottom of Another Bottle
Step 3: Wrap in Duct Tape
Put 3-4 layers of tape
Step 4: Cut Out Fins
Step 5: Wrap in Fins in Duct Tape
Step 6: Tape Fins On
Step 7: Poke Hole in Bottom
Do this step for the rocket to fly.
Step 8: Use Air Pressure to Launch
Use a bike pump to launch