Design Portfolio: Water Bottle Rocket

Cayla Vernon

1. Define the Problem

What need or want must be met by the solution?

Design and create a water-powered bottle rocket that has the longest airtime possible.

2. Brainstorming

In the space provided, sketch three possible solutions to the given problem. Remember to be creative!

3. Research and Generating Ideas

In the space below, document your research. Be sure to include proper citations at the end of your notes.


  • Make the rocket as light and stable as possible
  • Instability in the yaw and pitch axes will take the rocket off it’s intended flight path, so avoid that
  • Use light fin material
  • Use four fins to increase stability
  • Use as much air pressure as the constraints allow
  • Make the parachute as big as the constraints allow


4. Identifying criteria and specifying constraints

What are the criteria and constraints?

Materials List:

  • 2-liter bottle
  • Ping pong ball
  • Foam board
  • Clay
  • Exacto-knives
  • Hot glue
  • String
  • Table cloth

5. Exploring possibilities

Reflect on your brainstorm ideas and research notes. Generate any additional designs which you feel meet the criteria and constraints in the space below.

I improved my design over time by making my fins bigger for increased stability, using lighter material, and maximizing my parachute size.

6. Selecting an Approach

a. Enter the constraints of the project in the first column.

b. Score each sketch for each constraint. + = 3 pts., √=2 pts., - = pt. c. Total the columns and circle the highest score.

7. Developing a Design Proposal

Take your highest scoring sketch and create working drawings (sketches with dimensions, so that you could build your project). Attach your working drawings to this sheet.

8. Making a model or prototype

In the space below, document (using digital pictures) your construction of the model/prototype. Be sure to include a picture of the final model/prototype.

9. Testing and Evaluating the Design, using specifications

As you create your solution, you will perform tests to make sure that the solution is meeting the needs of the given problem. If you solution does not work, you may need to repeat the previous steps of the Engineering Design Process, until you find a functional design. In the space below, document the type of test you conducted and the results.

Test Performed

Test Results


3.73 seconds

10.Refining the Design

Based on your tests, propose refinements to the design and construction of the design problem in the space below.

Make sure the cone tube stays on.

11. Creating or Making It

If time allows, modify your model/prototype as proposed in refining the design. What additional steps would be necessary to produce this solution for mass market production?

If this rocket was to be mass produced, I think better and more professional materials should be used.

12.Communicating processes and results

Present your completed design portfolio as an oral presentation to the class.

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