We’ve recently added a nifty outdoor toy: The Water Rocket by 4M.
The concept is one you might have seen in smaller form: you pump up a model rocket that has a small amount of water inside. The pressure builds up a lot from your pumping and when you release the valve the high air pressure pushes the water out of the rocket. When that happens, good old Action/Reaction takes place to launch the rocket into the air.
This kit make a larger water rocket using a soda bottle and some parts to assemble it into a launchable rocket. The only thing not included is a bicycle pump – one that works a Presta valve (most do these days).
Once the rocket is assembled you pump it up and launch it up to 100 feet in the air! Please be sure to be outdoors.
This kit is a great entry into soda bottle water rocketry, don’t forget that you can buy a great instruction book to take things even further and make super soda bottle rockets!