Pump Rocket

I mean, how do you start? would be a flexible work or what you need?

I used 2-liter soda bottles, a cork and an air pump car (12volt). Fill the bottle one third full of water, soda and use of car air pump air into the bottle through a tube through the stopper. Finally, the bottle will pop the cork and pull up. It is best if you make a launch stand to hold the bottle up while the air pump is running.

pipe, plastic water bottle partially filled / 20lits and pump

I had one when I was little. until it landed in the neighbor's yard and never return. Waaa! but the one I gave you fill the rocket with water, then put on a pump. that would pump air into the rocket, then off pritty .. high they must sell to a major toy stores such as Toys R Us or a dollar store during the summer.