-Calculations-

1.

2.

3.

-Conclusions-

There are two major changes I would make of we were going to launch our rocket again.  One thing I would do to help our parachute come out easier is attach another smaller parachute on top of the big one.  This would come out easier than the big parachute.  When the small one was pulled out, it would drag and bring out the big parachute to slow down the egg.  This smaller parachute's main goal would be to get the big parachute out of the half cut bottle.  The other change I would make would be to take away the tape from the parachute to the full bottle.  After launching the rocket, I think the parachute would maybe have been able to come out on it's own without the help of the full bottle pulling it.  Also this would have insured that the two bottles separate from each other. This would have lead to our rocket going higher since we had already added weight to the nose to go higher.  These two changes would have helped the rocket go higher and keep the egg safer.  

-Results-

Our main issue with our rocket after the test was the parachute didn't come out.  To help this, we changed the parachute to a lighter bag and added a piece of tape to the parachute and the bottom of the full rocket.  We thought this would help it pull out the parachute.  When they separated this was suppose to pull it out and separate from the full bottle.  During our real test launch, our rocket was in the middle of the class talking about how successful it was.  Our rocket shot up, but instead of the tape breaking from the parachute and the bottom of the bottle, they stayed together.  This pulled out the parachute but didn't come out all the way.  This hurt the height of the rocket because it was not aerodynamic.  I think it would have been better without the tape.  It would have come out I think just because we used a lighter bag.  This also would have made our rocket fly much higher because the top part would have separated and it was aerodynamic and heavy enough to shoot up.  When the rocket came down, it was slow enough though that the egg did not break.  In conclusion the egg did not break but the rocket traveled 15 feet short of the goal.  

-Procedures-

1.  Cut one bottle in half.

2.  Cut cardboard in the shape of wings and put duct tape over it. 

3.  Tape wings onto the side of the base rocket(the bottle that is not cut). 

4.  Attach strings to the garbage bag and connect it to the end half bottle to use as a parachute.  

5.  Put clay in the nose of the half bottle to add weight.

6.  Put cotton balls and newspaper on top of the clay to protect the egg.

7.  Put a piece of duct tape on top of the newspaper to make sure it doesn't fall off when it detaches.

8.  Add a piece of tape to the end of the parachute and to the bottom of the full bottle.

9.  Put the parachute on top of the newspaper in the half cut bottle.

10.  Put bottom of full bottle into the half bottle. 

11.  Fill the full bottle two-thirds of the way with water. 

12.  Put bottle rocket on the pump, pump to 75, and launch.

-Materials-

1. 2 2-liter bottles- $1.69

2.  Scissors 

3.  Cardboard- $1

4.  Duct tape- $5 

5.  Clay- $4

6.  Cotton balls- $2

7.  Newspaper- $1 

8.  Egg 

9.  String- $2 

10. Plastic bag- $1.50