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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,
Kevin Colvill from Hailey, Idaho, USA,
and Rich Overbeck from Dallas Tx, USA

Altimeter Alternatives

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Alien Space Agency
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Altimeter Alternatives

Postby Alien Space Agency » Thu Nov 19, 2015 2:00 am

Do you allow 4 peak altitude altimeters in one rocket? The readings of the 4 altimeters will be estimated to get the average altitude. Then the readings will have +-10 ft margin of error. Or how about one PA altimeter and another logging altimeter? And will be estimated as well. And how about manual calculation?

I asked these questions because my country does not have any available altimeters in store. I do not want to buy online (too much hassle)

Nothing can stop a curious mind from inventing- Anonymous