Materials

Duct tape: $3

Cardboard (shoe box): free (shoes = $90)

2 Two liter soda bottles: $4

String: $2

Umbrella: $20

Foam (couch cushion): free (couch = $1,500)

Procedure

1. Using the cardboard from the shoe box, cut out four fins, all similar in length and width. Make them about 3 inches wide and 6 inches long

2. Duct tape them to the body of one of the 2 liter bottles. Tape them near the opening in the bottle but not too close. About 3 inches from the opening. Space them out evenly and tape them throughly. 

3. Once your fins are done and secured, cut the top and bottom off the second bottle. Cut about four inches from the top and as low as you can go on the bottom. Save all the pieces. 

4. Take the middle piece that you cut out and tape it to the top of other bottle. Tape it to the side away from the opening of the bottle. Make sure it is secure. 

5. Use the pieces of the top and the bottom of the bottle to create a capsule. Put them together and tape them together. 

6. Cut out three pieces of cardboard and tape them to the top of the capsule. Tape them in a pyramid shape and create a nose cone. 

7. Take the umbrella and remove all of the metal from it so it is just the fabric. 

8. Evenly poke 8 holes into the fabric of the parachute and tie string to these holes. Make the string about the length of the diameter of the umbrella. Make sure all of the strings are the same length.

9. Tape the loose ends of the string together. Tape this bunch of ends to the bottom of the capsule you created previously. 

10. Put foam inside the capsule and tape it shut. 

11. Fold up the parachute in an accordion fashion as tightly as possible. Wrap the string around the parachute and place the parachute in the empty container that is attached to the body of the rocket.

12. Place the capsule on top of the parachute. Do not tape it to the rocket. 

13. Place an egg in the capsule and launch the rocket. 

Results

Our rocket preformed very well. It launched very high, the capsule detached, the parachute deployed, and the egg survived. Our rocket was the only one to completely fulfill all of the requirements. Other groups got into trouble when their egg capsule did not deploy. The weight in the nose cone of our rocket allowed it to pull the entire capsule and parachute out of the body of the rocket. The weather did not effect our rocket in a negative nor positive way. There seemed to be no user error or equipment malfunction.  

Conclusion

Our rocket could have looked a lot better. We could have decorated it or made it look sleeker. The design was fairly solid but the nose cone and fins could use work. They were not exactly all the same size and the cone was slightly crooked. A correction to these would make the rocket fly higher and straighter. I would change this but nothing else. 

Calculations

Height at the top of trajectory:

The height given by the teacher was 80m. I believe that 80m is a more accurate measurement because 111.9 does not account for air resistance. The rocket did not fly directly straight up so the crooked path flight would effect the height of the apogee. I believe that the true height would be a lot less than 111 because of this. 80m is pretty far from 111 but it seems more reasonable, especially in comparison to other groups. 

  

Initial velocity:

FBD