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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.

Greetings from Madrid (Spain)

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Hostos
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Posts: 2
Joined: Wed Mar 21, 2018 3:36 pm

Greetings from Madrid (Spain)

Post by Hostos » Wed Mar 21, 2018 3:41 pm

Hi everyone. My name is David.

On March 21, 2018 the fourth grade students (8 years old) from the Primary School “Eugenio Maria de Hostos” (Madrid, Spain) has done an activity with water rockets with the aim of experimenting and learning about the scientific method.

The data and results of the activity were:

Experimental data:

15 water rockets
identical design
2 l of capacity
cork stopper in the bottles
Manual floor bicycle air pump.

Five of them with 250cc of water,
another five with 500cc of water,
and the last five with 750 cc of water.

Results: (Average of 5)

250 cc of water ………. 28,1 meters high
500 cc of water ………. 30,7 meters high
750 cc of water ………. 27,4 meters high

We have had a very pleasant morning and I think that the students have understood the scientific method in a fun way. :D



Hostos
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Posts: 2
Joined: Wed Mar 21, 2018 3:36 pm

Re: Greetings from Madrid (Spain)

Post by Hostos » Thu Mar 22, 2018 3:02 am

Sorry I made a mistake. Fourth grade is 10 YEARS OLD. :BD:



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anachronist
WRA2 Member
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Joined: Sun May 07, 2017 2:18 pm

Re: Greetings from Madrid (Spain)

Post by anachronist » Fri Mar 23, 2018 12:30 am

I was going to say, your 8 year old fourth graders are pretty advanced kids!
I was 9 years old in fourth grade.

Your students learned that there is an optimal amount of water to fill the rocket. The optimal amount depends on initial pressure and the empty mass of the rocket. Too little water and you don't have enough reaction mass to gain much altitude, too much water and the rocket is too heavy to lift its own weight. I have found, for 100 psi pressure with a 2 liter rocket weighing less than 200 grams, about 500-600 ml of water works best.



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