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Since our founding in 2003, we've become the largest, most sophisticated and ground breaking group supporting you, the serious water rocket flyer! Whether you are a beginner or an expert, the WRA2 has something for everyone.

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.


Hello Everyone. It is that time of year again. Time to approve changes to the competition rules for the new year.

You Can vote at:
viewtopic.php?f=32&p=19486#p19486

Please take the time to vote. TH:

Sysonby team best

Post your team or personal best. To be displayed on the WRA2 standings page(Altimeter Data and Videos are optional)
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160psi
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Sysonby team best

Post by 160psi » Mon Mar 28, 2011 3:54 pm

Just got our altimeter - an alt15k. First trial on Sunday with "Old Faithful II" as follows:

- Rocket volume 1300ml
- water volume 400ml
- nozzle 17mm
- weight 225g approx
- pressure 200psi
- recovery horizontal descent (not as stable as usual due to weight of altimeter)
- apogee 454 feet or 138m

attached is altimeter trace
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Spaceman Spiff
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Re: Sysonby team best

Post by Spaceman Spiff » Tue Mar 29, 2011 8:55 am

Isn't it cool how the spinning parachute can make the curve so bumpy on the way down? It amazes me that the sensor is that precise.


Spaceman Spiff
"What goes up, must come down"

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U.S. Water Rockets1
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Re: Sysonby team best

Post by U.S. Water Rockets1 » Sat Apr 02, 2011 10:12 pm

Spaceman Spiff wrote:Isn't it cool how the spinning parachute can make the curve so bumpy on the way down? It amazes me that the sensor is that precise.
We've seen that type of "bumpy" descent when using a really stretchy shock cord. The springy cord allows the rocket to bounce a lot. It makes for cruddy video of the descent too. :razz:


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160psi
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Joined: Thu Apr 17, 2008 11:53 am

Re: Sysonby team best

Post by 160psi » Sun Apr 03, 2011 5:33 am

Actually that rocket is a backslider and noremally comes down perfectly horizontally, but the small weight of the altimeter unbalanced it slightly and it tumbled quite badly, almost becoming a lawn dart.

It does make you realise how narrow the scope for error is with backsliders, and how it is best to launch with an equivalent weight "dummy" camera and altimeter before using the expensive stuff!



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Re: Sysonby team best

Post by WRA2 » Sun Apr 03, 2011 9:26 pm

160psi wrote:Just got our altimeter - an alt15k. First trial on Sunday with "Old Faithful II" as follows:

- Rocket volume 1300ml
- water volume 400ml
- nozzle 17mm
- weight 225g approx
- pressure 200psi
- recovery horizontal descent (not as stable as usual due to weight of altimeter)
- apogee 454 feet or 138m

attached is altimeter trace

You personal best altitude has been added to the official water rocket record standings page.

http://www.wra2.org/WRA2_Standings.php

Keep up the good work :cl:


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:WRA2: Forum Administrator. :WRA2:
:WRA2:The Water Rocket Achievement World Record Association :WRA2:

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