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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.

just add water

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bugwubber
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just add water

Post by bugwubber » Thu May 23, 2013 12:54 pm

just add water is a simple 16oz water rocket that can carry water for ballast. During the apogee and descent stages of flight, the water ballast is released to slow the rate of descent. The change to the COG causes the rocket to fall sideways, slowing it even more.

[youtube][/youtube]

Launch freeze frame:
just add water.JPG
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U.S. Water Rockets1
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Re: just add water

Post by U.S. Water Rockets1 » Sat May 25, 2013 10:58 pm

Getting the ballast out of the rocket in free fall where you cannot count on gravity is a challenge! Nice to see it working for you!


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bugwubber
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Re: just add water

Post by bugwubber » Mon May 27, 2013 12:32 pm

U.S. Water Rockets1 wrote:Getting the ballast out of the rocket in free fall where you cannot count on gravity is a challenge! Nice to see it working for you!
Thanks! Looking at the slow motion replays, a lot of the water appears to be expelled by centrifugal force as the bottle spins to a nose down attitude. Then, with the mass gone, there's nothing to keep the nose pointed at the ground.



There are limits..too much ballast water resulted in some water remaining in the rocket.

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Prodigy Rocketry
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Re: just add water

Post by Prodigy Rocketry » Sun Nov 24, 2013 2:56 pm

Interesting concept and a very cool launcher too.


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