Powered By AirTM , Design and build Paper and Straw Rockets and launch them with BalsaTron's Air Pump Powered Rocket Launcher which uses compressed air to achieve flight. A Bicycle pump is used to provide the air source for the launcher. Build up the air pressure in the storage tank and launch the rocket to test its performance. For safety, the storage tank has a pressure release valve which automatically releases the pressure. Ideal for outdoor activities.