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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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Altimeter exception

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Alien Space Agency
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Altimeter exception

Postby Alien Space Agency » Fri Nov 20, 2015 9:03 am

Hi, I have a question. Do we really have to use logging altimeters for all competitions? Because some countries are not selling any altimeters, including the PH. I really wanted to break the current Class B record, but because I haven't found any local online stores that sells the latter, I couldn't beat the record. How about using the traditional trigonometric altimeter (protractor)? At least we have solid proof on the altitude measurement. Well a video camera can reinforce the altitude measurement.

Margin of error: more or less 30 feet.
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Re: Altimeter exception

Postby WRA2 » Fri Nov 20, 2015 6:39 pm

Sorry but Class A, B, and E require use of a logging altimeter, Class D requires a "peak altimeter". Class C (flight duration) requires NO altimeter.
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Re: Altimeter exception

Postby Alien Space Agency » Sat Nov 21, 2015 8:30 am

Okay then. I'll try my best to find a cheap logging altimeter online. How about the HK bluetooth logging altimeter?
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Re: Altimeter exception

Postby WRA2 » Sat Nov 21, 2015 1:40 pm

That would probably work. We require mass produced altimeters that any team can purchase. If you can purchase it online and it logs altitude vs time which can be graphed, you should be ok using it.
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Re: Altimeter exception

Postby Alien Space Agency » Sun Nov 22, 2015 1:08 am

How about JL AltimeterThree? Its a BT logging altimeter.
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Re: Altimeter exception

Postby WRA2 » Sun Nov 22, 2015 2:28 am

The JL AltimeterThree would be acceptable.
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