Water Rocket Nozzle for Cork rockets
This is a nozzle adapter to turn a 20oz or 2 liter soda pop bottle into a water rocket! The only difference between this and the project it was remixed from is that the smaller hole does not contain threads. This makes it possible to use a cork and a bicycle pump to launch the rocket.
The water rocket is a great way of demonstrating Newton's 3rd law of motion.
To complete the water rocket, here's what you'll need:
- A soda bottle with a standard cap size. Water bottles may not work as many of them use a different style of cap.
- Electric tape
- Water
- Size 4 cork
- Bicycle pump with needle adapter
- Rocket platform (this can be home made)
- SAFETY GLASSES
Fill a soda pop bottle about a 1/3 of the way with water. Then wrap some electric tape around the neck of the bottle. The electric tape ensures that there is an air tight fit between the 3D printed part and the bottle. After that, screw in the 3D printed part and plug the hole with a cork. Be sure it is tight enough to be water tight, but not so tight as to prevent it from popping out at launch time. Using the smallest bit you can find, drill a hole through the center of the cork. Set the assembled rocket on the platform and insert the pump needle through the cork.
BE SURE YOU ARE WEARING SAFETY GLASSES. Clear the area of people and property in the direction that the water rocket is pointing. Begin pumping air into the bottle. When the pressure is high enough, the cork and water should pop out and the rocket will fly upwards. Soda pop bottles will begin to fail at 100PSI. If the cork has not popped out by then, it may be too tight. Point the cork away from you and anyone else if you choose to loosen it.
The reason the rocket flies up is due to Newton's 3rd law of motion: "For every action, there is an opposite and equal reaction". The bottle is then pulled back to the Earth due to gravity and friction. Experiment with the design of the bottle when launching. What angle sends the bottle the farthest? Are there modifications that can be done to make the bottle more aerodynamic?