Design a Racer
The next step in the design process is to design your item. In this case, we were to sketch out our designs and ideas for the kinematic racer.
Original Racer
Our original idea for the rubber band racer was the idea of a water bottle, turbine powered air car. We were then to attach two wheels onto a wooden dowel on either side, and then shove that dowel through the water bottle. We would do this for the front wheels and again for the back wheels. Next, the turbine would be the cut up top of another water bottle attached to yet another dowel. The turbine dowel would be shoved through the back of the water bottle with a bunch of rubber bands tied onto the end. The rubber bands that were tied would attach to the cap of the water bottle body.
Final Racer
Our second design was going to be a flat poster board racer with four wheels and a rubber band that would attach to the back axle. That rubber band would spin the wheels. The board is going to be cut 22 cm by 18 cm with a cutout at the back of 7 cm by 7.5 cm. The cutout will expose part of the axle where the rubber band can be attached onto the catch, a piece of tape wrapped around an excess piece of poster board. The axles are 25 cm and are made out of a fiberglass rod. The wheels are 11.5 cm diameter CDs that are hot glued to water bottle caps. The water bottle caps have smaller holes poked through them so that the wheels stay on the axles. The axles are then to run through a piece of PVC pipe in order to keep them attached to the car itself. The rubber bands are to hook onto another piece of PVC pipe on top of the car. This keeps the rubber bands from flying all over the place.
The rubber bands going through the middle of the bottle would be twisted, and when unraveled would twist the turbine. The turbine would then propel the car forward by pushing air back.