Rocket experiment (motion)

My partner and I made a rocket out of a bottle. Through many fails, we finally finished it. 

We made it with two bottles. One top part and one whole. We cut the top part of the bottle and taped that to the bottom of them other bottle and also added three fins. 

During the experiment, we did 2 trials. The first trial, we put 300ml of water. We tried to get how much seconds the rocket stayed in the air and we got about five seconds. As for the second trial, we tried it without any water in it. Unfortunately we lost data for the second one.

After the experiment, I became curious if we make the rocket a different way, would it still go up in the air.

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