© 2019 by Pernille Dahl & Cole Robbins. 

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Stomp Rockets

Parts needed:
  • 2 Models

  • Inner tube, 10" more or less

  • 1 PVC tube, 2" more or less 

  • Duct tape

  • Paper, 8 1/2 x 11 or larger 

  • Bottle

  • White tape

  • File folder or stiff paper

  • Yarn (for target) 

Extra Tools: 
  • PVC cutter

  • Launcher with prop blocks 

  • Pump and extension cords

  • 1/4" dowel, 12" for pushing through nose cone (several)

Project Description:

The foot goes down and the rocket goes up.

Concepts:

  1. The air gets forced out of the bottle when you reduce the bottles volume by smashing it.

  2. The air pushes the rocket up.  When the rocket leaves the tube, it doesn’t get pushed anymore.

  3. The rocket is going as fast as it will go just as it comes off the tube.  Then it goes slower and slower until it stops and then starts accelerating toward the ground.

Questions:

  1. Why might a big bottle work better than a small bottle?

  2. What do you think would happen if you made the tube a lot longer?

  3. Why do you think the rocket goes up when you stomp on the bottle?

  4. Where do you think the rocket is going the fastest?