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A water rocket is a type of model rocket using water as its reaction mass. The pressure vessel (the engine of the rocket) is constructed from thin plastic or other non metallic materials (usually a used plastic soft drink bottle) weighing 1,500 grams or less. The water is forced out by compressed air. It is an example of Newton's third law of motion.

The U.S. Water Rockets Launch Detect Acceleration/G-Switch

Members post instructions to construct water rockets, launchers, deployment systems, staging mechanisms, splicing bottles, and payloads.
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U.S. Water Rockets1
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The U.S. Water Rockets Launch Detect Acceleration/G-Switch

Post by U.S. Water Rockets1 » Thu Jun 20, 2013 4:43 pm

This tutorial will show you have to construct a very reliable and lightweight acceleration switch which you can use to activate electronic systems on your rocket such as a ServoChron(tm) 2 Dual Servo Actuated Parachute Recovery System. The design of the U.S. Water Rockets Launch Detect Acceleration/G-Switch is the lightest and most reliable design that we are aware of, besting other designs by an order of magnitude. Our best scale can resolve 1/10th of a gram and this switch design does not register on the scale so it weighs less than 0.1g. Our design is also very easy to adjust for different sensitivity or different applications.

The tutorial can be found at:

http://www.uswaterrockets.com/construct ... torial.htm

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