[Mr. Hart] wanted a quick and easy way to safely launch air-water rockets and came up with a pretty clever system. The core task is to pump air into the partially filled water bottle and then ...

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 ...

To construct their rockets, students used materials such as cardboard, plastic cones, and hot glue. Water served as the propellant, while an air pump pressurized the bottles before launch.

The dual-thrust concept is an interesting one, and is well explained by fellow YouTube channel [Air Command Rockets]. The basic idea is to use several chambers on the water rocket, one which ...

The rocket is part filled with water, and air is pumped in with a foot pump. When the rocket is released from the launcher, the high pressure inside the bottle equalizes with the air outside ...

Open the valve and attach the pump. Safety: Check the launch area is clear before ... force' then pushes the body of the rocket forward. Here, water and air are shoved out the back.