Table of Contents

## What is the best amount of water in a bottle rocket?

Typically the bottle will be between about one quarter and one third filled with water. To launch the water rocket, we need to pump air into the rocket: this provides the energy for the launch.

## How do you make a water propelled rocket?

Fill the soda bottle 1/3 full of water. Insert the cork into the mouth of the soda bottle. Pump the soda bottle full of air. Blast off!

**How do you calculate thrust in a water rocket?**

Thrust equals mass flow rate times the exhaust velocity. Mass flow rate is found using the water density, nozzle area, and exhaust velocity. The square of the exhaust velocity is equal to 2 times the internal gauge pressure divided by the water density.

**What makes a water rocket go higher?**

When the bottle is released from the launcher, air escapes the bottle. As the bottle pushes out the air, the air pushes the bottle upwards (Newton’s Third Law of Motion). Increasing the thrust (adding more pressure to the bottle) increases the acceleration.

### Is there a fun simulator for water rockets?

Water Rocket Fun Simulator. This program can help students and rocketeers understand the physics of water rockets and how to optimize their water rocket launches to obtain the highest apogees. The interface is designed to be easy to use and understand. Windows, MAC and Linux versions available for download.

### What are the different types of rocket simulation programs available?

There are three simulation programs available at this site: BottleRocketSim is intended for younger students. It is a highly graphical, 1 dimensional, Flash simulation with very few input parameters. RocketModeler II is intended for middle and high school students. It is a 2 dimensional, Java applet with a large number of inputs.

**How can I learn the physics of water rockets?**

Links to websites containing water rocket mathematical formulas, parachute calculations, drag calculations, online or downloadable computer models. This program can help students and rocketeers understand the physics of water rockets and how to optimize their water rocket launches to obtain the highest apogees.

**What is the optimum amount of water needed to launch a rocket?**

The optimum amount of water depends on a number of interdependent factors such as weight of the rocket, its drag coefficient, launch pressure, nozzle size etc. There is no simple rule to calculate the optimum amount of water for any particular rocket.