Final Design

The final design is a modified version of design #3. After testing the sling shot idea turned out to be the best design so I added to the design to make it work was proficiently as possible. I reinforced the sides with two layers of cardboard and covered all pieces in duct tape. These improvements make the structure of the shoot sturdier and makes it easy to reload and do it quickly. Three rubber bands were also used instead of one to give the car more of a boost from the extra elasticity. Finally, at the back of the car a wooden cylinder with a notch in the back was added. This helped keep the rubber bands as far away from the wheels as possible so that they do not get catch and make it spin of coarse. In testing the design worked well. About 8 of the 10 tries I when over the 160 cm make needed and when in a straight line. On another try the car spun out of control and when about 100cm. The last try the rubber band catch on the wheels and it did a 360 in the air. Seeing that the testing showed a vast majority of the car working better then necessary, I am confident for the Monday's testing.

I will upload a picture of the design once the car and shoot have dried and are finished.