this is a easy bottle rocket
you will need
a bike pump
some 1/4'' vinyl tubing
a water bottle (Aquafina water bottles do not work)
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Step 1: Cut a Hole in Cap
cut a hole in cap a little smaller than the tubing
Step 2: Wrap Pipe in Duck Tape
wrap one end of the tube in duck tape
duck tape your tube to your cap
make it a good seal.
attach tube to bike pump
make it a good seal
screw the cap on bottle
and pump it up 4-5 times
to shoot it point it up
lightly unscrew the bottle it will pop
and it will fly 20-40'
if you fill it a 1/4 of the way full with water it will go a lot higher
disclaimer I'm not responsible for what you
do with this instructable or any harm done