At this writing the most useful document for me is listed first. The full title is:
Iterative Predictors of Water Rocket Flight Events
The second link appears to be the parent site. It is mostly in German with many sections in English. There are many good articles, but many are quite advanced.
During our meeting on 12 December, we launched a water rocket several times. While we made no scientific measurements, we discovered that the ideal amount of water is about 1/2 full. In this series of web pages and lessons will will discover some of the things that control how the water rocket flies and what determines how fast and how high it flies.
Our first rocket was a simple store purchased one. It uses a simple plug to hold in the water and air until some pressure is reached. At that point, the pressure forces the plug, called a bung, out and the rocket launches. There is little control over when it launches and consequently, little control over the air pressure at launch.
The next set of links are to some discussions and tutorials on building a better launch mechanism. Students may wish to get their parents involved and build a launch platform. As I learn more I will write more. Meanwhile, do some searches of your own with phrases like: water rocket release and water rocket launch.
The NASA document is not real clear about what holds the rocket in place while presurizing it. Part 11, the Mending Plates supply the downward force to keep the rocket pressed onto the bung.
We begin with the basic characteristics of the water rocket: its mass. Visit this web page and start there: water_rocket_mass.htm page.
At this writing I have created the pages for calculating the Thrust and the Acceleration of our water rocket.
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