Water-rockets science for hobbyist, students, and teachers of all ages.


Tue Jul 15 21:08:13 2025 GMT Home What's A "Water Rocket"? Safety First Water-Rocket Simulation Building A Rocket How much water do you put in a water rocket? Maximum Safe Pressure Flying High What is load fraction? Using the Simulator How do I build a launcher? What is the best fin shape, size, and placement? How do you use the water rocket simulation? Adding a Parachute Using CO₂ Who invented water rockets? Rocket History Contact Us	Q: What is load fraction? A: Load Fraction is the fraction of the rocket motor volume that is filled with water. A rocket half full of water has a load fraction of 0.5 A rocket one third full has a load fraction of 0.33 A rocket one quarter full has a load fraction of 0.25 Load Fraction is the ratio of the water volume to the total volume of the motor. For example, if you put 0.8 liters of water in a 2-liter motor the load fraction is 0.4.
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