Design Process: Beginning to End

At first we thought that making our balloon car small would be better, and it would've except for the fact that the wheels hit each other because they were too close together. Also, we had too much tape and cling wrap on the car, so it weighed too much, and did not move. When we tested this idea, both of the trials failed. First of all, the car turned because of wheels and axles. Second of all, the car didn't move past 4 ft. because of weight and the wheels. We decided to make a whole new design. At school we started making our new design, and finished most of it there. We decided to keep the CDs, straws, scewers, and the egg carton ideas. This time we included corks, instead of erasers, and also added a base for the balloon to sit on. We made a base so that the balloon wouldn't hit the wheels. We finally tested it at school, but it didn't move very far because it had too much mass. On Thursday we all met after school, and made a new platform for the balloon, so we changed a CD case to a small piece of cardboard to make it weigh less. Also, we got rid of the tape, extra glue, and part of the styrofoam egg carton. We finally tested it, and it worked.