# Bottle Rocket

### 1. Define the ProblemHow to get a bottle rocket to stay the longest in flight 2. BrainstormingIn 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.

Notes: The Chinese used the rocket through fireworks

The greeks used rocketry through a steam powered wooden pigeon

Around WW1 the rocket was studied the most to take down enemy watch balloons and after that it was studied very little

Scientist wanted rockets to be able to lift bigger loads

Rockets able to carry bigger loads consists of alcohol and liquid oxygen

America sent spies over to Germany and they brought back scientist, these scientist helped figure out how to send a rocket to space.

Drag, lift, thrust, weight

trophosphere, stratosphere, mesosphere, ionosphere, exosphere

3 laws of motion=

-Every object persists in its state of rest or uniform motion in a straight line unless it is compelled to change that state by forces impressed on it.

-Force is equal to the change in momentum (mV) per change in time. For a constant mass, force equals mass times acceleration (F=ma)

-For every action there is an equal and opposite reaction

wheight=massxgravity

mass=densityxvolume

Drag=0.5pV^2ACd

Center of gravity and center of pressure keeps the rocket stable

Want it to rotate around the center of gravity not center of pressure

There are three recovery systems

Lawndart recovery, falls nose first back to earth

Tumbling, any part of the rocket can hit the earth

Backsliding, the rocket falls back side first

The static margin is the distance between the balance point and center of pressure

The drag has to egual the weight for a good recovery

Citations/References:

http://front.whiteboxlearning.com/sessions/b94258d8dfb710/index.html

4. Identifying criteria and specifying constraints

Materials List

• Pepsi bottle
• parachute
• ping pong ball
• Cone tube
• cone translation
• water
• air
• Foam board or balsa wood

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 think my best rocket would consist of being tall and be as aerodynamic as possible. It also has to have the perfect amount water and air pressure in it. The bigger the parachute is also better. You need to have the smallest amount of wait in the nose as possible for you parachute to deploy.

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., - = 1 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).

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.

10.Refining the Design. Based on your tests, propse refinements to the design and construction of the design problem in the space below.

I would probably make the ball heavier and make the parachute a little smaller so it would deploy.

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?

I would change the fins and make the a little larger. I would also change the parachute size so it would actually deploy

12.Communicating processes and results. Present your completed design portfolio as an oral presentation to the class.