Download the Water bottle Rockets PDF(378 Kb ... until the cork pops and the bottle flies away. Here's a simpler design using a pump that has a needle for inflating things like rugby or soccer ...

He’ll be the talk of the 4th of July picnic once he brings out his latest build—a weaponized, remote-controlled strandbeest that shoots bottle rockets. There are a bank of money shots up on Imgur.

Make a launchpad that holds the bottle with the neck downwards, lets you attach the pump and stand behind the bottle. One good method is to plant a spade or garden fork in the ground at a low angle ...