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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.

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Shalini from New Delhi, India,
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and Rich Overbeck from Dallas Tx, USA

Weight verification

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RaZias
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Weight verification

Postby RaZias » Wed Dec 09, 2009 4:48 pm

To verify that a rocket really went to a certain height, there are cameras and altimeters, but what about the weight ?

I mean a person can put the rocket on the top of a balance and film it, but who says to me that someone couldn´t hack the balance to give a lighter weight ?

A person may want to reinforce more the rocket and it might pass the 1500gr...
Research and Development is the soul of WR
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Re: Weight verification

Postby WRA2 » Wed Dec 09, 2009 10:27 pm

RaZias wrote:To verify that a rocket really went to a certain height, there are cameras and altimeters, but what about the weight ?

I mean a person can put the rocket on the top of a balance and film it, but who says to me that someone couldn´t hack the balance to give a lighter weight ?

A person may want to reinforce more the rocket and it might pass the 1500gr...


If a competitors weight was challenged during the public review of a submission we could ask them to provide a photo of the rocket on a scale. A competitor that was cheating would lose the respect of the community. The Multi stage competition is the most likely place where the weight limit would come into question with a competitor adding more stages and staging mechanisms.

All of the submissions we have had in the other classes have been far below the 1500 Gram limit.
Lisa Walker,
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:WRA2:The Water Rocket Achievement World Record Association :WRA2:
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U.S. Water Rockets1
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Re: Weight verification

Postby U.S. Water Rockets1 » Sun Dec 13, 2009 12:06 am

We suggest that if there is a problem we will put our heads together and invent a weight validation method that is hard to cheat. A system with a weight to counterbalance the rocket using a volume of water that could be videotaped in action might be a good start. The alternative is to implement a set of draconian paperwork and sworn affidavits from a series of witnesses and all the proof of identity that would require. Nobody wants to turn this fun sport into a tyrannical beaurocracy, so when it becomes an issue we will solve the problem with a majority vote on a verification system. Sound good?
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